All Tools

Generate time-based one-time passwords from a TOTP secret key. Enter your base32 secret, choose a period and digit length, and get the current and next codes with a live countdown timer. Useful for testing and debugging 2FA integrations.

Generate Zod validation schema code from a JSON sample object. Infers z.string(), z.number(), z.boolean(), z.array(), z.object(), and z.null() types automatically. Handles nested objects, arrays of objects with optional field detection, and outputs copy-ready TypeScript with import and z.infer type alias.

Format, validate, and inspect JSON Lines (JSONL) and NDJSON files. Validates each line individually, reports parse errors by line number, outputs compact JSONL or a pretty-print preview, and lets you download the cleaned file.

Calculate screen width and height from diagonal size and aspect ratio. Convert between inches and centimeters for displays, TVs, and monitors with instant dimension calculations.

Calculate the information-theoretic bit entropy of any password or API key. Detects character set pools automatically, shows the total number of possible combinations, and estimates crack time across five attack scenarios from rate-limited web logins to GPU cracking clusters.

Check TLS protocol version compatibility and cipher suite strength ratings against current best practices. Supports IANA and OpenSSL cipher names — rates each suite as Strong, Weak, or Deprecated and explains why.

Scan pasted text, code, or config files for accidentally exposed API keys, tokens, passwords, and private keys. Detects 50+ secret types across AWS, GitHub, Stripe, OpenAI, and more — all client-side, nothing leaves your browser.

Validate TOML configuration file syntax and report errors with line numbers. Paste any TOML content — Cargo.toml, pyproject.toml, config.toml — and instantly see a green checkmark with key counts and structure stats, or a precise error message pointing to the exact line. Includes a collapsible JSON structure preview to confirm what was parsed.

Build Content Security Policy headers interactively. Toggle directives like script-src, style-src, and img-src, select allowed source tokens, and add custom origins. Instantly outputs your CSP as an HTTP header, meta tag, Nginx directive, or Apache header.

Calculate DPI (dots per inch), image dimensions, and print sizes. Convert between pixels and physical dimensions for printing and displays.

Hash API keys using SHA-256, SHA-512, or PBKDF2 before storing them in your database. Generates a Node.js verification snippet and shows the recommended storage format — all 100% client-side using the Web Crypto API.

Convert TOML configuration files to JSON format instantly. Paste any TOML — Cargo.toml, pyproject.toml, config.toml — and get clean, pretty-printed JSON output. Supports all TOML types: strings (basic, literal, multi-line), integers (decimal, hex, octal, binary), floats, booleans, datetimes, arrays, inline tables, tables, and arrays of tables.

Extract HTML table markup and convert it to clean CSV format. Paste any HTML snippet or full page source — the tool finds the table, parses thead and tbody rows, handles colspan and rowspan merging gracefully, and outputs a properly quoted CSV ready to download or paste into a spreadsheet. When multiple tables are found, switch between them with a click.

Generate Ed25519 and RSA 4096-bit SSH key pairs entirely in your browser. Keys are never sent to any server — 100% client-side using the Web Crypto API.

Convert CSV data to formatted Markdown table syntax instantly. Supports quoted fields, embedded commas, and escaped quotes. Choose left, center, right, or auto alignment (auto right-aligns numeric columns). Output is properly padded and ready to paste into any Markdown document, README, or GitHub wiki.

Generate ready-to-paste IP allowlist and blocklist rules for nginx, Apache, iptables, UFW, and AWS Security Groups. Enter IP addresses or CIDR ranges, select your target platform, and get production-ready firewall config instantly.

Generate TypeScript interfaces from JSON objects instantly. Infers types for strings, numbers, booleans, arrays, and nested objects. Detects optional fields from array element merging, handles null values, and outputs clean, ready-to-use interface definitions.

Convert JSON objects to TOML configuration file format instantly. Nested objects become [table] sections, arrays of objects become [[array-of-tables]], and primitive arrays output as inline arrays. Optionally auto-detects ISO 8601 date strings and converts them to native TOML datetime values. Outputs clean, human-readable TOML ready for Cargo.toml, pyproject.toml, or any TOML-based config.

Convert between international paper sizes (A4, Letter, Legal) with dimensions in mm, cm, and inches. Compare ISO A/B series and North American paper standards.

Generate PGP public and private key pairs for email encryption and code signing. Supports ECC (Curve25519) and RSA up to 4096-bit. Entirely browser-side — keys never leave your device.

Convert INI configuration files and Java .properties files to JSON format instantly. Paste any INI file — php.ini, app.ini, Windows .ini — or a Java .properties file with dotted keys and get clean, structured JSON output. Supports section headers, inline comments, quoted values, boolean coercion (true/false/yes/no/on/off), numeric parsing, continuation lines, and Unicode escapes.

Count words, characters, sentences, and reading time instantly

Drag and drop to rearrange PDF pages in any order. Upload your PDF, preview all pages as thumbnails, drag pages to reorder them, and download the rearranged PDF. Fast, visual, and privacy-focused.

Convert between MPG (miles per gallon), L/100km (liters per 100 kilometers), and other fuel efficiency units. Compare car fuel economy across different measurement systems.

Predict child adult height based on parent heights using the Mid-Parental Height method. Calculate how tall your child will be with genetic predictions.

Calculate inflation-adjusted values using historical CPI data from 1950-2026. See what past dollars are worth today, or project how much you'll need in the future to maintain purchasing power.

Convert clothing sizes between US, UK, EU, and international sizing systems. Find equivalent sizes for men's, women's, and kids' clothing with body measurements.

Convert seconds to HH:MM:SS time format instantly with precise calculations and easy-to-read formatting.

Build and decode OAuth 2.0 scope strings for Google, GitHub, Stripe, and custom providers. Toggle permissions with risk indicators, generate ready-to-use scope strings, and decode existing scope strings to understand what access they grant.

Count sentences, analyze sentence length, and get detailed sentence statistics instantly.

Calculate your Body Mass Index and health category

View and search large text files up to 200MB in your browser. Features virtual scrolling, line numbers, search functionality, and file statistics. Perfect for log files, CSV, JSON, and code files.

Split large CSV files into smaller files by number of rows. Process large datasets in manageable chunks instantly.

Obfuscate JavaScript code to protect your intellectual property. Encode strings, rename variables, inject dead code, and add debug protection to make reverse engineering more difficult.

Find out what day of the week any date falls on - past, present, or future dates instantly.

Convert shoe sizes between US, UK, EU, and international sizing systems. Find your perfect fit for men's, women's, and kids' shoes across different countries.

Merge Excel sheets - Combine multiple Excel files into a single workbook with all sheets preserved

Create custom QR codes for URLs, text, and contact info

Generate secure, cryptographically random API keys for authentication and authorization. Create custom API keys with various formats including hex, base64, and prefixed keys.

Compress files to ZIP - Create ZIP archives from multiple files with customizable compression settings

Parse HTTP cookie strings into readable key-value pairs. Decode URL-encoded values and inspect cookies from browser requests.

Generate JSON-LD Product schema markup for SEO. Add product details like name, price, brand, rating, and availability to create structured data for rich search results.

Deobfuscate JavaScript by decoding hex and unicode escape sequences, expanding eval(atob()) and eval(unescape()) patterns, folding string concatenation, and converting hex numbers — all in your browser.

Generate secure RSA public/private key pairs for encryption, digital signatures, and authentication. Create 1024 to 4096-bit RSA keys instantly in your browser.

Calculate aspect ratios, find missing dimensions, and convert between different aspect ratios for videos, images, and screens. Supports 16:9, 4:3, 21:9, and more.

Generate professional AI-powered replies to messages with customizable tone and style. Perfect for emails, chats, and messages.

Generate random fake names for testing and development purposes.

Escape and unescape special characters in JSON string values. Handles double quotes, backslashes, newlines, tabs, carriage returns, and Unicode \u sequences. Real-time bidirectional conversion with a built-in escape sequence reference.

Generate random dictionary words for creative writing, brainstorming, games, and password creation.

Decode HTTP status codes and OAuth 2.0 error strings with plain-English descriptions, common causes, and actionable fix suggestions. Covers every HTTP 1xx–5xx status code and all standard OAuth 2.0 error responses. Results appear instantly as you type.

Convert hours to minutes instantly. Simple, accurate time conversion calculator for work hours, schedules, and time management.

Convert milliseconds to seconds, minutes, hours, days, and weeks with precise calculations and instant results.

Generate random paragraphs with grammatically correct sentences for lorem ipsum alternative, testing, and content placeholders.

Generate secure numeric PINs for devices, accounts, and security systems. Create random PINs with strength analysis and security recommendations.

Format, validate, and pretty-print JSON with our developer-friendly editor.

Add page numbers to PDF documents. Choose position (top/bottom, left/center/right), format (1, Page X of Y, X/Y), font size, color, and skip pages. Fast, customizable, and privacy-focused browser-based processing.

Test HTTP API endpoints directly in your browser. Make GET, POST, PUT, PATCH, and DELETE requests with custom headers and request bodies. View status codes, response headers, and pretty-printed JSON responses — all client-side, no server proxy.

Count down to special events and important dates. Perfect for weddings, birthdays, vacations, project deadlines, and celebrations with live time tracking.

Check if any year is a leap year. Understand leap year rules and find past or future leap years instantly.

Split text by any delimiter into separate lines or segments instantly.

Boost productivity with the Pomodoro Technique: work in focused 25-minute intervals with short breaks. Perfect for studying, coding, writing, and focused work.

Convert multiple images to a single PDF document. Upload images, reorder pages, and customize PDF page size. Supports JPG, PNG, WebP, and all common image formats.

Generate random fake addresses for testing and development purposes.

Count syllables in text with detailed word-by-word analysis and linguistic statistics.

Parse URL query strings into readable key-value pairs. Decode parameters and inspect URL search queries with ease.

Calculate PPI (pixels per inch) for screens and displays. Find pixel density from resolution and screen size for phones, tablets, monitors, and TVs.

Generate complete fake person profiles including name, email, phone, and address for testing.

Create beautiful Markdown tables visually with a spreadsheet-like editor. Set headers, adjust column alignment, and see live preview. Perfect for GitHub READMEs, documentation, and wikis.

Parse user agent strings to extract browser, operating system, device, and engine information. Essential for web analytics, device detection, and browser compatibility testing.

Generate simple placeholder logos with monograms, shapes, and preset color palettes. Perfect for mockups, prototypes, and early-stage branding.

Generate random grammatically correct sentences for creative writing, testing, and content creation.

Convert steps walked to calories burned. Calculate how many calories you burn based on your steps, weight, and walking intensity. Free instant results with distance and active time estimates.

Calculate calories burned while cycling based on speed, duration, weight, terrain, bike type, and wind conditions. Get accurate calorie estimates for your cycling workouts.

Add or subtract hours, minutes, and seconds to/from any time. Perfect for calculating flight arrivals, work schedules, cooking times, and time zone conversions.

Calculate ISO week number for any date. Find which week (1-53) of the year any date falls in.

Convert minutes to hours instantly. Get results in both decimal hours and hours:minutes format. Perfect for time tracking, payroll, and scheduling.

Minify and compress HTML code to reduce file size for production. Remove comments, whitespace, and optimize markup for faster loading.

Generate random numbers with customizable range, quantity, and format options instantly.

Format and beautify Python code following PEP 8 style guidelines with proper indentation, spacing, and line breaks. Perfect for cleaning up messy code or enforcing consistent style.

Format and beautify API responses for better readability. JSON formatter with minify and prettify options.

Write and preview Markdown with live rendering

Convert ring sizes between US, UK, and EU sizing systems. Find equivalent sizes using diameter or circumference measurements for accurate ring fitting.

Generate random dates within custom ranges with multiple format options.

Convert areas between square feet, square meters, acres, hectares, and square yards instantly

Generate random fake phone numbers for testing and development purposes.

Generate clean placeholder images with custom sizes, colors, and labels. Perfect for wireframes, mockups, and design systems.

Calculate formula amount needed by age and weight. Get personalized daily formula recommendations, feeding schedules, and supply planning for your baby.

Calculate the exact number of days between two dates. Get instant results for total days, business days, weekends, and more. Perfect for project planning, vacation tracking, and deadline management.

Convert Unix timestamp (epoch time) to human-readable date and time. Supports seconds and milliseconds.

Convert between length, weight, and volume units instantly. Support for metric and imperial systems.

Validate RSS and Atom feeds. Check structure, required fields, and preview entries. Supports RSS 2.0, RSS 1.0, and Atom 1.0. Free and runs entirely in your browser.

Create beautiful neumorphism (soft UI) CSS effects with live preview. Generate soft, extruded 3D elements with dual shadows. Perfect for modern minimalist designs.

Calculate the precise difference between two dates in years, months, weeks, days, hours, minutes, and seconds. Perfect for tracking project durations, age calculations, event countdowns, and more.

Compress images to reduce file size while maintaining quality. Supports PNG, JPG, and WEBP formats with adjustable quality settings. Convert between formats for optimal compression. All processing runs locally in your browser - files never leave your device.

Clean Excel data - Remove empty rows, duplicates, whitespace, and standardize text formatting in Excel files

Rotate PDF pages clockwise or counterclockwise. Upload your PDF, preview all pages as thumbnails, rotate individual pages or all pages at once, and download the rotated PDF. Fast, visual, and privacy-focused.

Extract files from ZIP archives - Unzip and download files from ZIP archives directly in your browser

Generate HMAC (Hash-based Message Authentication Code) signatures for message authentication and data integrity verification. Supports SHA-256, SHA-384, SHA-512, and more.

Set a countdown timer for any duration. Perfect for cooking, workouts, meetings, and time management with customizable timers and preset options.

Format messy HTML into clean, readable markup with consistent indentation and structure. Perfect for cleaning up minified or poorly formatted templates.

Calculate baby growth percentiles for weight, length/height, and head circumference based on WHO and CDC growth standards. Track your baby development from 0-36 months.

Generate random times in 12-hour, 24-hour, timestamp, and seconds formats.

Convert between time zones and see current or custom time across different parts of the world

Count lines, non-empty lines, and analyze text line by line instantly.

Delete specific pages from a PDF. Upload your PDF, preview all pages as thumbnails, mark unwanted pages for deletion, and save the cleaned PDF. Fast, visual, and privacy-focused.

Add or subtract days, weeks, months, or years from any date to calculate future or past dates with precision.

Generate random IPv4 and IPv6 addresses in multiple formats for testing and development.

Split PDF into multiple files or extract specific pages. Choose from multiple split modes: extract page ranges, split into individual pages, or divide by chunks. Downloads as single PDF or ZIP archive.

Extract specific columns from CSV data. Select which columns to keep and remove the rest instantly.

Analyze password strength with real-time feedback, security scoring, and actionable recommendations to create stronger passwords.

Convert data types in CSV - Transform CSV column values to numbers, booleans, dates with automatic type detection and cleaning

Convert GIF images to modern WEBP format with superior compression and quality. Reduce file sizes significantly while maintaining image quality. Perfect for web optimization and faster loading times. All conversions run locally in your browser - files never leave your device.

Search and replace text with advanced options. Support for case sensitivity, whole word matching, and regular expressions for powerful text transformations.

Find MIME type for file extensions instantly. Look up media types for images, videos, documents, and more.

Combine multiple PDF files into one document. Easy drag-and-drop interface with privacy-focused browser-based processing. Upload PDFs, reorder them, and merge into a single file.

Decode JWT (JSON Web Token) headers and payloads locally in your browser. View claims, algorithm info, and signature without sending data to any server.

Minify and compress CSS code to reduce file size for production. Remove comments, whitespace, and optimize styles for faster loading.

Validate API key format and detect the provider instantly in your browser. Supports OpenAI, Stripe, GitHub, AWS, Google, Anthropic, HuggingFace, Slack, SendGrid, Twilio, and more. Includes entropy analysis.

Extract selected pages into a new PDF. Upload your PDF, preview all pages as thumbnails, select the pages you want to extract, and download a new PDF containing only those pages. Fast, visual, and privacy-focused.

Validate CSV format - Check CSV files for errors, inconsistent columns, empty values, and formatting issues

Minify and compress JavaScript code to reduce file size for production. Remove comments, whitespace, and optimize code for faster loading.

Convert CSV to Excel - Transform comma-separated values to Excel spreadsheet with auto-width columns

Calculate the duration between two dates and times. Get results in days, hours, minutes, and seconds.

Convert PNG, JPG, and GIF images to modern WEBP format with superior compression and quality. Reduce file sizes by up to 30% compared to JPG while maintaining excellent visual quality. All conversions run locally in your browser - files never leave your device.

Generate UUID v4 (Universally Unique Identifiers) for databases, APIs, and distributed systems. Create single or batch UUIDs with one click.

Encrypt and decrypt text using AES (Advanced Encryption Standard) with secure key-based encryption. Protect sensitive data with industry-standard 256-bit encryption.

Calculate optimal sleep and wake times based on 90-minute sleep cycles. Get personalized recommendations for when to sleep or wake up to feel refreshed and energized.

Remove extra spaces, line breaks, and special characters

Convert XML markup to JSON format. Perfect for API modernization, data extraction, integrating legacy XML systems with modern JSON APIs, and SOAP to REST migration.

Remove duplicate words from your text instantly. Clean up repeated words while preserving word order and sentence structure with smart detection.

Calculate exact age in years, months, and days

Format and beautify JavaScript code with proper indentation, spacing, and line breaks. Perfect for unminifying compressed code or standardizing code style.

Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly with live conversion

Convert speeds between miles per hour (MPH), kilometers per hour (KPH), and knots instantly

Generate JSON-LD BreadcrumbList schema markup for SEO. Add breadcrumb items with names and URLs to create structured data that helps search engines understand your site hierarchy.

Sort CSV by columns - Order CSV rows by one or more columns in ascending or descending order with multi-level sorting support

Generate random browser user agent strings for testing and development.

Filter CSV rows based on column values and conditions. Create focused datasets by filtering data instantly.

Validate OpenAPI 2.0 (Swagger) and OpenAPI 3.0/3.1 specification files for compliance, missing required fields, unresolved $ref paths, and schema errors. Paste JSON or YAML or upload a file — errors and warnings are listed by path with severity levels and actionable fix suggestions. All validation runs entirely in your browser.

Calculate daily calorie needs based on age, weight, height, and activity level. Get personalized calorie goals for weight loss, maintenance, or weight gain using the Mifflin-St Jeor equation.

Generate random MAC addresses in multiple formats for testing and development.

Group and aggregate CSV data by one or more columns to create summary pivot views. Supports Count, Sum, Average, Min, and Max aggregations with multi-column grouping. Paste or upload any CSV, select group-by columns and aggregation type, and download the pivot summary as a new CSV file. Runs entirely in your browser.

Remove duplicate rows from CSV files - Deduplicate CSV data by all columns or specific key columns, keeping first or last occurrence

Convert between watts, kilowatts, and horsepower with our simple power converter tool.

Calculate BMI percentile for children and teens aged 2-20 using CDC growth charts. Get accurate BMI assessment based on age, gender, height, and weight.

Convert HTML markup to clean Markdown syntax. Perfect for content migration, documentation, web scraping, and converting web pages to Markdown format.

Calculate what score you need on your final exam to achieve your target grade. Enter your current grade, final exam weight, and desired grade to instantly see the required final exam score with achievability status

Handle null and empty values in CSV - Replace, remove, or keep missing data with flexible null handling strategies

Generate a valid OpenAPI 3.0 spec in your browser without writing YAML by hand. Define your API title, version, and server URL, then add endpoints — each with method, path, summary, tags, request body JSON, and response examples. The tool infers request and response schemas from your JSON examples and outputs a complete OpenAPI 3.0.3 spec in YAML or JSON. Download the file and use it with Swagger UI, Postman, Redoc, or any OpenAPI-compatible toolchain. Free, client-side, no signup.

Generate a unique webhook URL and receive live HTTP requests. Inspect request headers, method, body, and timestamp in real time. No account required — payloads are stored temporarily for debugging.

Look up HTTP status codes and their meanings instantly. Understand error codes and how to fix them.

Generate placeholder text for your designs

Generate professional ad creatives instantly with AI. Create 5 compelling captions, 3 short descriptions, catchy punchlines, and powerful CTAs. Choose from punchy, emotional, clever, or salesy styles. Perfect for social media ads, marketing campaigns, and advertising copy.

Convert any date and time to Unix timestamp (epoch time). Get timestamps in seconds and milliseconds.

Rename CSV columns - Change CSV column headers and standardize naming conventions with camelCase, snake_case, or Title Case

Calculate personalized macros for ketogenic diet. Get your ideal fat, protein, and carb intake based on 75-20-5 keto ratios. Achieve and maintain ketosis for effective weight loss.

Convert Postman Collection v2.1 JSON to OpenAPI 3.0 specification format. Upload or paste your collection, and get a downloadable openapi.yaml or openapi.json with mapped paths, parameters, request bodies, and example responses.

Convert PNG, JPG, and WEBP images to next-generation AVIF format with superior compression and quality. AVIF provides better compression than WEBP while maintaining excellent image quality. Perfect for modern web applications. All conversions run locally in your browser - files never leave your device.

Build UTM tracking parameters for marketing campaigns. Generate tracked URLs with campaign source, medium, campaign name, term, and content parameters.

Polish your client messages instantly. AI-powered tool for freelancers to sound professional, confident, and clear in every client communication. Get two polished versions with different tones.

Format messy CSS into clean, readable styles with consistent indentation and spacing. Perfect for cleaning up minified or poorly formatted stylesheets.

Count paragraphs, sentences, words, and analyze text structure instantly.

Remove trailing spaces from the end of each line in your text. Clean up code, emails, and documents by trimming unwanted whitespace instantly.

Transform text into study materials instantly. Paste your lecture notes or textbook chapters and get key points, short notes, summary, and exam questions. Perfect for students preparing for exams.

Check JavaScript code for syntax errors instantly in your browser. Get exact line and column numbers for each error, plus code statistics like function count, variable declarations, and imports. Free and works offline.

Validate and inspect webhook payloads in your browser. Auto-detects GitHub, Stripe, Slack, and Shopify webhooks, extracts event details, and optionally verifies HMAC signatures. Free and private.

Calculate which day number (1-365/366) any date is in its year. Track progress through the year and find milestone days.

Convert PDF pages to high-quality JPG images. Select specific pages or convert all pages at once. Download as individual images or ZIP file for multiple pages.

Calculate your daily water intake needs based on weight, activity level, and climate. Get personalized hydration recommendations in liters, ounces, cups, and glasses.

Convert CSV to XML - Transform comma-separated values to XML format with customizable elements and pretty printing

Generate random fake email addresses for testing and development purposes.

Display current time in multiple cities around the world. Compare time zones and schedule across regions.

Convert next-generation AVIF images to widely-compatible JPG format with adjustable quality settings. Perfect for ensuring maximum browser compatibility and sharing images with older systems. All conversions run locally in your browser - files never leave your device.

Generate random colors in HEX, RGB, and HSL formats with preview and customizable options.

Flatten nested JSON objects into flat key-value pairs. Convert complex JSON to simple format and back.

Generate strong, memorable passwords using random words. Create secure passphrases that are easy to remember but hard to crack.

Create beautiful CSS and Tailwind gradients with a visual editor. Support for linear and radial gradients with full control over colors, angles, and stops.

Simulate how colors appear to people with color vision deficiencies.

Create beautiful glassmorphism CSS effects with live preview. Generate frosted glass UI with backdrop blur, transparency, borders, and shadows. Perfect for modern web designs.

Calculate words per page for different formats. Convert between word count and page count based on font size, line spacing, and page size.

Convert JSON data to XML format. Perfect for API integration, data transformation, legacy system compatibility, and SOAP services. Supports nested objects, arrays, and custom formatting.

Convert XML to CSV - Transform XML documents to comma-separated values with automatic field extraction

Calculate running pace, speed, and finish times. Get pace per km/mile, predicted race times, and split times. Perfect for runners training for 5K, 10K, half marathon, or marathon.

Calculate your Basal Metabolic Rate (BMR) - the calories your body burns at complete rest. Uses the Mifflin-St Jeor equation for accurate BMR calculation.

Convert between cups, tablespoons, teaspoons, milliliters, and other cooking measurements. Quick and accurate conversions for recipes and baking.

Generate URL-friendly slugs from any text. Create SEO-optimized slugs for blog posts, products, and web pages instantly.

Convert colors between HEX, RGB, and HSL with live preview, contrast checking, and quick-copy formats for your design system.

Generate JSON-LD FAQPage schema markup for SEO. Add questions and answers to create structured data that helps search engines display FAQ rich snippets in search results.

Online stopwatch timer with lap tracking. Measure time intervals precisely for sports, cooking, work tasks, and more.

Check WCAG contrast ratios to ensure accessible color combinations.

Convert between KB, MB, GB, and TB with our simple data storage converter tool.

Calculate your monthly loan EMI (Equated Monthly Installment) with detailed breakdowns of principal, interest, and total payment.

Calculate your fertile days and ovulation date based on menstrual cycle. Track your fertile window for conception planning and understand your cycle better.

Generate strong, random passwords with customizable length and character options. Create secure passwords locally in your browser with real-time strength indication.

Convert Excel to CSV - Transform Excel spreadsheets (.xlsx, .xls) to comma-separated values with sheet selection

Upload a CSV, Excel, or JSON file to understand its structure, quality, and patterns. Get column profiles, data quality scores, duplicate detection, outlier analysis, and AI-powered insights — all in your browser.

Encode and decode URL strings instantly in your browser. Converts special characters to percent-encoding and back. Handles spaces, Unicode, query parameters, redirect URLs, and all RFC 3986 reserved characters.

Compare two JSON objects and highlight differences. Perfect for debugging API changes and data transformations.

Format and beautify SQL queries with support for multiple dialects (PostgreSQL, MySQL, SQL Server, SQLite). Configure keyword case, indentation, and minify options.

Convert HEIC/HEIF images to JPG format with adjustable quality settings. All conversions run locally in your browser - files never leave your device. Perfect for converting iPhone photos to a universally compatible format.

Calculate cumulative college GPA across multiple semesters. Track overall GPA, major GPA, and institutional GPA separately. Supports transfer credits, honors eligibility checking, and semester-by-semester breakdown

Compute and verify HMAC webhook signatures in your browser. Supports HMAC-SHA256, SHA-512, and SHA-1 with hex or base64 encoding. Compatible with Stripe, GitHub, Twilio, and any HMAC-signed webhook.

Calculate conversion rates for your marketing campaigns, websites, and sales funnels. Find out what percentage of visitors take your desired action.

Calculate GST inclusive and exclusive prices. Add or remove GST with CGST, SGST, and IGST breakdown for Indian businesses.

Generate darker variations of any color for design depth and dark themes.

Merge multiple CSV files into a single unified dataset. Combine CSVs with identical headers instantly.

Generate Facebook Open Graph meta tags for social media sharing. Create og:title, og:description, og:image, og:url, and og:type tags. Perfect for optimizing how your links appear on Facebook, LinkedIn, WhatsApp, and Slack.

Convert HTML to React JSX format instantly. Transform class to className, inline styles to objects, and more for React development.

Calculate your daily macronutrient needs (protein, carbs, fats) based on your goals. Get personalized calorie targets and macro splits for fat loss, muscle gain, or maintenance with meal distribution examples.

Calculate lean muscle mass based on body weight and body fat percentage. Track your muscle mass, fat mass, and body composition for fitness goals.

Encode and decode Base64 strings with UTF-8 support. Supports standard Base64 and Base64URL. Perfect for encoding text, handling API tokens, embedding data URIs, and debugging web applications.

Generate SQL INSERT statements from CSV data. Convert spreadsheet data to database-ready SQL queries instantly.

Calculate your daily protein needs based on weight, activity level, and fitness goals. Get personalized recommendations for muscle gain, fat loss, or athletic performance with meal distribution guidance.

Calculate age-appropriate sleep schedules for babies and toddlers. Get personalized daily schedules with nap times, wake windows, and bedtime recommendations based on your baby's age.

Generate MD5 and SHA-256 hashes from input text. Perfect for checksums, password verification, data integrity checks, and debugging cryptographic operations.

Format and beautify TypeScript code with proper indentation, spacing, and line breaks. Preserves type annotations, interfaces, generics, and all TypeScript-specific syntax.

Convert WEBP images to JPG format with adjustable quality settings. All conversions run locally in your browser - files never leave your device. Perfect for universal compatibility and smaller file sizes.

Extract colors from uploaded image - Get dominant color palette with HEX and RGB values from any photo

Generate professional receipts for free. Create, customize, and download receipts with your business details, itemized purchases, taxes, and payment methods. Print or save as PDF instantly.

Test SOAP web services directly from your browser. Select SOAP version (1.1 or 1.2), enter an endpoint URL, set the SOAPAction header, write your XML envelope, and send the request via fetch(). View the formatted XML response, detect SOAP Faults, and copy the full response. Free, browser-based, no proxy.

Generate Twitter Card meta tags for Twitter/X sharing. Create summary cards, large image cards, app cards, and player cards. Optimize how your links appear on Twitter with custom titles, descriptions, and images.

Calculate business days between two dates, excluding weekends and optional holidays for accurate work-day planning.

Convert between PSI, bar, pascal, and kilopascal with our simple pressure converter tool.

Calculate income tax payable and net income after tax with customizable tax rates and deductions

Convert JPG images to PNG format with lossless quality. All conversions run locally in your browser - files never leave your device. Perfect for preserving image quality and adding transparency support.

Convert CSV data to HTML table format with customizable styling. Generate clean, semantic table markup instantly.

Convert JSON to Excel - Transform JSON data to Excel spreadsheet with nested object flattening and customizable formatting

Change the page size of any PDF to A4, Letter, Legal, A3, A5, Tabloid, or Executive. Choose how content is fitted — scale to fit, scale to fill, stretch, or centre. All processing runs in your browser. Nothing is uploaded.

Calculate body surface area (BSA) using multiple formulas including Du Bois, Mosteller, Haycock, and Gehan & George. Essential for medical dosing, cardiac index, and burn assessment.

Decode and validate JWT tokens instantly in your browser. Inspect header and payload claims, check expiry, and verify HMAC signatures (HS256/HS384/HS512). Free and private.

Calculate offset, limit, cursor, and page-based pagination parameters for API responses. Generates Link headers and standard response headers instantly.

Format and beautify PHP code following PSR-12 coding standards with proper indentation, spacing, and line breaks. Perfect for cleaning up messy code or enforcing consistent style.

Calculate gross and net profit margins from your revenue and costs. Analyze business profitability with detailed breakdowns.

Calculate target heart rate zones for exercise training. Get personalized HR zones for fat burn, cardio, anaerobic, and peak performance based on age, resting heart rate, and fitness level.

Convert between different time units - seconds, minutes, hours, days, weeks, months, and years.

Convert PNG images to JPG format with adjustable quality and transparency handling. All conversions run locally in your browser - files never leave your device. Perfect for reducing file sizes while maintaining image quality.

Calculate your pregnancy due date from last menstrual period or conception date. Get estimated due date, current week, trimester milestones, and time remaining.

Construct and sign JWT tokens locally in your browser. Edit header and payload JSON, choose HS256/HS384/HS512, enter a secret, and generate a signed token instantly. Nothing is uploaded.

Calculate your ideal body weight using multiple medical formulas including Devine, Robinson, Miller, and Hamwi methods. Get personalized recommendations based on height, age, and gender.

Validate and inspect OAuth tokens in your browser. Decode JWT access tokens and ID tokens to view claims, scopes, and expiry. Analyse opaque tokens for entropy and format. Free and private.

Convert between liters, gallons, cups, and milliliters with our simple volume converter tool.

Generate robots.txt file to control search engine crawlers. Create user-agent rules, allow/disallow paths, set crawl delays, and add sitemap URLs. Perfect for managing bot access to your website.

Convert TSV to CSV - Transform tab-separated values to comma-separated values with automatic quoting

Validate CSS syntax instantly in your browser. Get real-time feedback on errors and warnings with exact line and column numbers. Shows rule count, declarations, selectors, at-rules, and comment statistics.

Convert CSV files or pasted data into JSON format instantly with support for headers, delimiters, and pretty-printed output. All conversions happen locally in your browser.

Calculate final grade based on assignments and weights. Support multiple assignment categories (homework, quizzes, tests, final exam) with custom weights, show current grade and what's needed on remaining assignments

Convert WEBP images to PNG format with lossless quality. All conversions run locally in your browser - files never leave your device. Perfect for preserving transparency and maximum quality.

Convert Markdown text to HTML markup instantly. Supports headings, lists, links, code blocks, tables, and all standard Markdown syntax.

Calculate with fractions - add subtract multiply divide. Support all operations with automatic simplification to lowest terms, mixed number support, decimal conversion, and step-by-step solution display

Generate professional freelance proposals instantly with AI. Create complete proposals with introduction, scope, deliverables, timeline, and pricing. Perfect for freelancers, consultants, and agencies bidding on projects.

Decode X.509 SSL/TLS certificates and RSA private keys in your browser. View subject, issuer, SANs, validity dates, key type, serial number, and SHA-256/SHA-1 fingerprints. Optionally check if a certificate and private key match.

Calculate the extra calories needed for breastfeeding mothers. Get personalized daily calorie recommendations based on your activity level, breastfeeding type, and baby's age.

View Apache Parquet files in your browser — browse rows, inspect schema, and explore metadata. No code, no server, no uploads.

Convert PDF files to editable PowerPoint presentations. Each PDF page becomes a slide with the original layout preserved as a high-quality image. Download as a .pptx file ready for Microsoft PowerPoint, Google Slides, or LibreOffice Impress.

Lint Apache .htaccess files for syntax errors, unclosed block tags, and common misconfigurations. Detects RewriteRule issues, invalid status codes, deprecated access directives, and unclosed IfModule blocks. Free and runs entirely in your browser.

Generate beautiful, harmonious color palettes for UI design, branding, and themes. Choose from random, analogous, complementary, or monochromatic modes. Lock favorite colors and export as HEX, RGB, or JSON.

Generate realistic mock HTTP responses for testing and API development. Pick a method, status code, and response template — get a complete mock response with headers, JSON body, and raw HTTP format. 100% client-side and free.

Calculate your take-home pay after taxes and deductions. Estimate net salary from gross salary with monthly and annual breakdowns.

Convert JSON data to CSV spreadsheet format instantly with support for nested object flattening, custom delimiters, and headers. All conversions happen locally in your browser.

Calculate Tax Deducted at Source (TDS) for Indian payments with automatic ₹ formatting

Convert a colour PDF to grayscale instantly in your browser. All pages are processed locally — nothing is uploaded to any server. Works with scanned documents, presentations, and any PDF file.

Convert plain CSS to SCSS/Sass instantly. Automatically nests child selectors under their parents, extracts repeated hex colors as $variables, and preserves @media blocks — no server required.

Generate professional invoices for free. Create, customize, and download invoices with your business details, line items, taxes, and payment terms. Print or save as PDF instantly.

Calculate Return on Investment with multi-currency support

Document a REST endpoint quickly by entering the URL, method, headers, and sample request/response. Generates formatted Markdown documentation and an example cURL command instantly.

Validate XML sitemaps against the sitemap protocol specification. Checks structure, required fields, URL count, changefreq values, and priority ranges. Supports both URL sitemaps and sitemap index files. Free and runs entirely in your browser.

Estimate body fat percentage using the US Navy method with simple body measurements. Calculate fat mass, lean mass, and understand your body composition category.

Test and debug regular expressions with live highlighting, capture groups, and match details. Supports all JavaScript regex flags (g, i, m, s, u).

Compare two API response payloads and highlight added, removed, and changed fields. Paste any two JSON responses to get an instant field-level diff with color-coded changes and a summary count.

Calculate tip amounts and split bills easily. Enter bill amount, tip percentage, and number of people to see tip amount, total cost, and per-person amounts. Includes preset tip percentages (15%, 18%, 20%, 25%).

Compare the true cost of renting vs buying a home over time. Calculate breakeven point, equity buildup, investment opportunity cost, and get a personalized recommendation based on your specific situation.

Calculate working capital and current ratio from your current assets and liabilities. Assess your business liquidity and financial health.

Upload a log file to instantly see error counts, log level distribution, top IPs, and top paths — then run AI-powered analysis to identify errors, anomalies, and performance issues.

Calculate percentage of any number, find what percent one number is of another, percentage increase/decrease, and percentage difference with real-time results

Turn cURL commands and raw HTTP requests into clean Markdown API documentation instantly. Paste one or more requests, and the generator extracts the method, URL, query parameters, headers, and JSON body, then outputs a structured Markdown doc with a parameter table, header table, request body block, and a formatted cURL example. Supports CRUD sets — paste multiple requests separated by a blank line and get a complete multi-endpoint reference. Free, browser-based, no server.

Convert Excel spreadsheets (.xlsx, .xls) to PDF in your browser. Preserves table structure with formatted headers, alternating row colours, and sheet labels. Choose the sheet and page orientation before converting.

Calculate days until any future date with countdown for important events, deadlines, and milestones.

Generate JSON Web Keys (JWK) for RS256, ES256, HS256 and other JWT signing algorithms. Produces public/private key pairs and ready-to-use JWKS endpoint JSON for RSA, ECDSA, and HMAC algorithms. All keys are generated locally in your browser using the Web Crypto API — nothing is sent to any server.

Anonymize sensitive data by replacing PII patterns — emails, phones, SSNs, credit cards, IPs, and URLs — with redacted placeholders. Works on JSON, CSV, logs, or any plain text. 100% client-side and free.

Format C++ code instantly in your browser. Choose brace style (K&R, Allman, or GNU), indent size, and pointer alignment — no server required.

Visually design layered box shadows with fine-grained controls. Create production-ready CSS and Tailwind utilities for cards, modals, and UI elevations.

Full-featured scientific calculator with trigonometric, logarithmic, exponential functions, memory operations, and calculation history

Test GraphQL API endpoints directly from your browser. Enter an endpoint URL, write a query, add variables and custom headers, then send the request via fetch(). Inspect the JSON response, view GraphQL errors separately from HTTP errors, and copy the full response. Free, browser-based, no proxy.

Validate your robots.txt file against the Robots Exclusion Protocol. Checks directive syntax, path formats, Crawl-delay values, and Sitemap URLs. Previews crawl rules per user-agent group. Free and runs entirely in your browser.

Remove password protection from PDF files. Enter your known password to unlock the PDF and download an unprotected copy — all processing happens in your browser.

Calculate grade point average from grades. Support multiple GPA scales (4.0, 5.0, 10.0), letter grade to GPA conversion, weighted/unweighted GPA, semester GPA and cumulative GPA tracking

Convert CSV to TSV - Transform comma-separated values to tab-separated values with automatic quote removal

Generate structured, realistic mock data for API endpoint testing. Define fields with names and types — UUID, name, email, integer, enum, date, and more — set how many rows you need, and export as a JSON array, NDJSON, or CSV. All generation runs entirely in your browser with no data sent to any server.

Validate HTML markup and check for common issues. Detect missing attributes, accessibility problems, deprecated tags, and structure errors. Free and runs entirely in your browser.

Validate email address format and check DNS/MX records. Detect typos in common email providers and verify domain deliverability. Free, instant, and secure.

Generate a tailored, professional cover letter in seconds. Enter the job title, job description, and your experience — the AI writes a compelling 3-paragraph cover letter matched to the role.

Calculate A/B test statistical significance with chi-square test. Determine which variant wins with confidence levels, p-values, and performance metrics.

Calculate standard deviation and variance. Support both population and sample statistics, paste data from Excel/CSV, show mean, median, variance, standard deviation, and complete statistical analysis

Paste any JSON object and instantly generate a JSON Schema Draft-7 document. Infers types for strings, numbers, integers, booleans, null, nested objects, and arrays. Marks non-null fields as required and sets additionalProperties to false. Free and runs entirely in your browser.

Convert PDF files to editable Word documents. Text is extracted from each page and written into a .docx file ready for Microsoft Word, Google Docs, or LibreOffice Writer.

Generate HTML meta tags for SEO optimization. Create title, description, keywords, viewport, charset, robots, and author meta tags. Perfect for improving search engine rankings and social sharing.

Calculate discounted prices and savings from an original price and discount percentage. See final price and amount saved instantly.

Reduce PDF file size by removing metadata, annotations, and redundant objects. Choose Low, Medium, or High compression and download with a before/after size comparison.

Add password protection to your PDF files. Set document open password, owner password, and control permissions for printing, copying, and editing. Secure your sensitive documents.

Look up live DNS records for any domain. Query A, AAAA, MX, TXT, CNAME, NS, SOA, and CAA records instantly via Cloudflare DNS-over-HTTPS — no installation required.

Calculate how much you need to save for retirement. Project savings growth, estimate monthly retirement income, and see if you're on track to meet your goals with Social Security and inflation adjustments.

Parse and visualize X-RateLimit headers from raw HTTP API responses. Paste response headers to instantly see your quota state — limit, remaining, used, and reset time — displayed as color-coded progress meters. Supports GitHub, OpenAI, Twitter/X, Shopify, and IETF standard rate limit headers.

Generate lighter variations of any color for backgrounds and light themes.

Analyze any JSON payload for sensitive data before logging, sharing, or storing it. Instantly detects PII (emails, phone numbers, dates of birth), credentials (passwords, API keys, JWT tokens, high-entropy secrets), financial data (credit card numbers, bank account fields), and network identifiers (internal IP addresses). Flags each field with a path, detected type, risk level (High / Medium / Low), and actionable reason. Optionally redact all sensitive values in one click. Free and runs entirely in your browser — your data never leaves your device.

Generate common HTTP request headers for authentication, content-type, caching, and security. Toggle each category, configure values, and copy the output as raw key-value pairs, JSON, fetch(), cURL, or axios.

Format Kotlin code instantly in your browser. Fix indentation, enforce opening-brace-on-same-line style, and add trailing commas to function parameters and class bodies — no server required.

Validate XPath expressions instantly in your browser. Paste an optional XML document to evaluate the expression and see matched nodes. Supports XPath 1.0 with all axes, predicates, and built-in functions.

Validate XML syntax and structure with detailed error reporting. Check well-formedness, view element statistics, and debug XML issues. Free and runs entirely in your browser.

Calculate safe polling intervals, per-client request capacity, burst headroom, and throttle risk from any API rate limit. Enter your rate limit, time window, and number of concurrent clients to instantly see the minimum delay between requests, per-client allocation, burst capacity, and a color-coded throttle risk assessment. Supports Stripe, GitHub, X (formerly Twitter), OpenAI, Twilio, and any custom rate limit. Free and runs entirely in your browser.

Preview how your title and meta description appear in Google search results. See real-time character counts, pixel width estimates, and desktop/mobile previews to optimize your SEO.

Calculate probabilities for events — shows fraction, decimal, percentage, complement, and odds. Supports single events and two independent events (AND/OR).

Compile Stylus to plain CSS instantly in your browser. Resolves variables, flattens nested selectors, expands mixins, and handles nested @media blocks — no Node.js required.

Parse and analyze HTTP request or response headers. Identifies categories, explains each header, flags missing security headers, and detects duplicates or suspicious values — entirely in your browser.

Format Swift code instantly in your browser. Fix indentation, enforce opening-brace-on-same-line style, and normalize spacing around operators — no server required.

Format and clean up Ruby code instantly in your browser. Fix indentation, align end blocks, and normalize string quotes — no server required.

Convert JavaScript Fetch, Axios, Python requests, or PHP cURL code into a ready-to-run cURL command. Paste your HTTP client code and instantly get the equivalent cURL command with the correct method, URL, headers, and request body. Useful for debugging, sharing API requests with teammates, and testing in the terminal. Free, instant, and runs entirely in your browser — your code and tokens never leave your device.

Calculate the break-even point for your business in units and revenue. Determine how many units you need to sell to cover all costs.

Validate YAML syntax instantly in your browser. Get real-time feedback on errors with exact line and column numbers. Supports multi-document YAML and shows document statistics including nesting depth and key counts.

Calculate auto loan payments and interest with trade-in value, down payment, sales tax, registration fees, and other costs. Compare financing options and see total cost of vehicle ownership.

Build and send HTTP API requests directly from your browser. Set method, URL, query params, headers, and body (JSON, raw, or form-encoded). View the response status, headers, and body — and copy an equivalent cURL command for terminal use. Free, browser-based, no proxy.

Calculate and simplify ratios to lowest terms. Find GCD, decimal ratios, percentages, and generate equivalent ratios instantly.

Convert Word documents (.docx) to PDF format instantly in your browser. Preserves text, headings, lists, and basic formatting.

Format Rust code instantly in your browser. Fix indentation, enforce opening-brace-on-same-line style, and add trailing commas to structs and enums — no server required.

Convert Apache Parquet files to CSV format instantly in your browser. No uploads, no server — all processing is 100% client-side.

Convert Pug (formerly Jade) templates to clean HTML instantly in your browser. Supports variables, mixins, loops, conditionals, and attribute shorthand — no server required.

Solve quadratic equations ax²+bx+c=0 instantly. Get real and complex roots, discriminant, vertex, graph visualization, and step-by-step solutions. Perfect for students, teachers, and professionals.

Calculate recommended study hours for exams based on material volume, difficulty level, and available time. Get a personalized daily study schedule.

Calculate monthly mortgage payment with principal, interest, property taxes, insurance (PITI), and HOA fees. Shows amortization schedule, total interest paid, and payoff date with extra payment scenarios.

Format Go code instantly in your browser. Fix indentation with tabs, enforce brace-on-same-line style, and align var block declarations — no server required.

Calculate circle area, circumference, radius, and diameter from any one known value. Also computes arc length, sector area, and chord length for a given central angle.

Convert JSON data to YAML format instantly. Perfect for config files, CI/CD pipelines, Kubernetes manifests, and infrastructure-as-code workflows. 100% client-side and free.

Build CORS configuration headers interactively for web servers and APIs. Set allowed origins, methods, request headers, credentials, and preflight cache duration — then copy the generated Access-Control headers or ready-to-paste code snippets for nginx, Express.js, Flask, and .NET.

Paste or upload a CSV file to detect and fix common data quality issues. Remove empty rows, trim whitespace, normalize line endings, deduplicate records, and replace null values — with a table preview before downloading.

Generate bcrypt hashes from passwords and verify passwords against existing bcrypt hashes. Configurable cost factor. Runs entirely in your browser — nothing is uploaded.

Calculate monthly car lease payments from MSRP, negotiated price, residual value, and money factor. See depreciation fee, finance fee, effective APR, and total lease cost.

Calculate your total net worth by entering assets and liabilities by category. See asset allocation, liability breakdown, debt-to-asset ratio, and your financial health snapshot.

Paste a PEM certificate to instantly validate expiry, signature algorithm, key strength, SAN presence, and trust chain. Get a clear pass/warn/fail report for each check.

Convert SQL query result output to CSV. Paste the formatted table from psql, MySQL, SQLite, or any space-aligned CLI result and get clean, importable CSV — entirely in your browser.

Calculate MPG and fuel efficiency. Support both US (miles/gallons) and metric (km/liters) units. Shows fuel efficiency rating, cost per mile/km, and annual fuel cost estimates.

Calculate how your savings grow over time with regular deposits. See final balance, total contributions, and interest earned. Includes goal-based mode to find out how much you need to save monthly to reach your target.

Convert CSV files to Apache Parquet format instantly in your browser. Automatic type inference, Snappy compression, no uploads required.

Generate realistic sample webhook payloads for Stripe, GitHub, Slack, and custom event schemas. Select a provider and event type to instantly produce a correctly structured JSON payload you can copy or download to seed webhook handlers, write tests, and build integrations.

Generate personalised B2B cold emails in seconds. Enter the recipient details and your product or service, choose a tone, and the AI writes a concise, reply-worthy email complete with subject line, opening hook, value pitch, and call to action.

Convert XML to TOON (Token Oriented Object Notation) and reduce LLM token usage. XML is the most verbose format — savings can exceed 50%. Free, browser-based.

Calculate your test score percentage and letter grade from points earned. Instantly see your grade, points missed, and how many more points you needed for the next grade up.

Calculate rectangle area, perimeter, and diagonal length from length and width. Instantly see aspect ratio with a visual diagram.

Calculate triangle area, perimeter, all angles and sides from any valid combination of known values. Supports SSS, SAS, ASA, and AAS input modes.

Calculate debt payoff timeline with different strategies. Compare snowball (smallest balance first) vs avalanche (highest interest first) methods to find the fastest and cheapest way to become debt-free.

Compile Less to plain CSS instantly in your browser. Resolves @variables, flattens nested selectors, expands parametric mixins, and handles nested @media blocks — no Node.js required.

Calculate powers and exponents with support for negative and fractional exponents. Shows step-by-step working, reciprocal form, and root equivalents.

Convert any cURL command into ready-to-run code for JavaScript Fetch, Axios, Python requests, or PHP cURL. Paste your cURL command and instantly get equivalent code that preserves the method, URL, headers, and request body. Supports GET, POST, PUT, DELETE, and PATCH. Free, instant, and runs entirely in your browser — your API tokens never leave your device.

Calculate the square root of any number. Instantly shows the result, perfect square check, simplified radical form, and cube root.

Convert hourly wage to annual salary with overtime calculations. Calculate monthly, biweekly, weekly, and daily pay equivalents for full-time and part-time schedules.

Convert numbers between binary, octal, decimal, and hexadecimal instantly — with live results, prefix toggling, and one-click copy.

Convert YAML to TOON (Token Oriented Object Notation) and reduce LLM token usage. Free, instant, browser-based.

Build a Postman Collection v2.1 JSON file in your browser without writing JSON by hand. Add a collection name and description, then define your API endpoints — each with method, URL, headers, and request body. The collection JSON is generated in real time. Download the file and import it directly into Postman or Insomnia. Free, client-side, no signup.

Validate GraphQL SDL schema syntax and detect type conflicts or missing definitions. Paste your schema to instantly check for duplicate type names, undefined type references, unclosed braces, and empty type bodies. Errors are shown with line numbers and actionable fix suggestions. All validation runs in your browser — your schema is never sent anywhere.

Convert YAML data to JSON format instantly. Supports nested objects, arrays, and multi-level structures. Output as pretty-printed or minified JSON. 100% client-side and free.

Validate cron expressions, get a plain-English explanation of what they mean, and see the next scheduled run times — all in your browser.

Generate 5 high-converting email subject line variations instantly. Each uses a different copywriting technique — direct, curiosity, urgency, benefit-led, and number-driven — with character counts and open-rate tips.

Evaluate JSONPath expressions against JSON to find matching values. Supports dot notation, recursive descent, wildcards, array slicing, union, and filter expressions. Shows each match with its full resolved path. 100% client-side and free.

Convert JSON to TOON (Token Oriented Object Notation) and reduce LLM token usage by 30–50%. Free, instant, browser-based.

Decode protobuf binary data (as hex or base64) to a human-readable field structure. Shows field numbers, wire types, and interpreted values without needing a .proto schema.

Searchable reference for 80+ well-known TCP and UDP ports. Look up any port number or service name to see the official protocol, service description, port range (well-known/registered), and security recommendations for risky ports.

Calculate central tendency measures — mean, median, mode, and range — for any set of numbers, with frequency distribution.

Compile SCSS to plain CSS instantly in your browser. Resolves variables, expands nested selectors, processes mixins, and handles @media blocks — no build tool required.

Calculate how your money grows with compound interest. Enter principal, interest rate, time period, and compounding frequency to see final amount, total interest earned, and year-by-year growth breakdown.

Format and prettify GraphQL queries, mutations, subscriptions, and fragments with correct indentation.

Format and validate GraphQL query variables JSON for use in queries and API clients. Paste your variables JSON alongside a GraphQL query to instantly format the JSON, validate that each variable matches its declared type, catch missing required variables, and highlight undeclared extras.

Solve proportions and cross-multiplication problems. Find the missing value in a/b = c/d with step-by-step solutions.

Generate realistic fake records for testing and QA. Define a field schema, pick data types — UUID, email, name, phone, date, and more — set a row count, and export as JSON or CSV. 100% client-side and free.

Calculate Customer Lifetime Value from ARPU, monthly churn rate, and gross margin. Get gross and net LTV, LTV:CAC ratio with benchmark rating, and a churn sensitivity table showing how LTV changes across different churn rates.

Lint Dockerfile instructions for best practices, security issues, and layer optimization. Flags unpinned base images, root user, ADD vs COPY, apt-get mistakes, shell-form CMD, and more — with fix guidance for each issue.

Validate GitHub Actions workflow YAML for syntax errors, missing required fields, deprecated commands, mutable action refs, outdated action versions, and broken job dependencies. Get per-job results with fix hints in real time.

Calculate simple interest using the I = P × r × t formula. Enter principal, annual rate, and time period to see interest earned, total amount, daily/monthly/yearly accrual, and a comparison with compound interest.

Calculate any side of a right triangle using the Pythagorean theorem (a² + b² = c²). Find the hypotenuse or either leg instantly with formula visualization and triangle diagram.

Generate RFC 7636 PKCE code verifier and challenge pairs for OAuth 2.0 authorization code flow. Choose verifier length, get the SHA-256 code challenge, and see exactly where each value goes in the auth URL and token exchange request.

Decode MessagePack binary data (hex or base64) to human-readable JSON. Inspect each token with its byte offset, format code, type, and decoded value — entirely in your browser.

Calculate your Net Promoter Score from promoter, passive, and detractor survey response counts. Get your NPS score (-100 to +100), category rating, and side-by-side benchmark comparison against 10 industries.

Estimate monthly API costs from request volume and per-request or per-token pricing tiers. Enter your monthly request volume, configure up to 3 pricing tiers, and see total cost, cost per 1K requests, cost per user, and the number of users needed to break even.

Calculate customer and revenue churn rates for monthly, quarterly, or annual periods. Get annualized churn rates, retention metrics, and a 12-month projection showing how churn compounds over time.

Calculate how many months it takes to recover your customer acquisition cost from gross profit. Enter CAC, average MRR per customer, and gross margin to get your payback period with industry benchmark comparison across SaaS segments.

Calculate per-seat SaaS pricing with configurable volume discount tiers and annual billing discounts. Enter your base price per seat, team size, and discount tiers to see price per seat, total MRR/ARR, and the savings from volume and annual billing.

Calculate subnet ranges, usable host counts, broadcast addresses, and subnet masks from CIDR notation. Shows network and host addresses in both decimal and binary with color-coded bit visualization.

Convert pixel values to rem and em CSS units instantly. Set your root and parent font sizes, enter a single px value for a live result, or paste a list of values to convert in bulk. Includes a common sizes reference cheat sheet.

Decode base64-encoded JSON payloads and pretty-print the result with syntax highlighting. Supports standard and URL-safe base64 variants.

Convert hexadecimal strings to readable text and text back to hex encoding. Supports space-separated hex, 0x prefixes, continuous hex strings, and full UTF-8 output.

Calculate Monthly Recurring Revenue from subscription plan tiers and customer counts. Get total MRR, ARR, ARPU, and a visual tier breakdown showing each plan's contribution.

Convert text to Unicode code points, HTML entities, or JS/Python escape sequences — and decode them back to text.

Calculate Annual Recurring Revenue, YoY growth rate, and net new ARR. Enter current and previous ARR (or MRR) with optional movement breakdown to get NRR and a visual ARR bridge.

Generate responsive breakpoint media queries for common device sizes and custom ranges. Choose from Tailwind, Bootstrap 5, or Material UI presets, or define your own breakpoints with mobile-first or desktop-first approach.

Calculate your free trial conversion rate and see the revenue impact of conversion improvements. Enter trial signups, converted customers, and average MRR to quantify how +1%, +5%, or +10% conversion gains translate to additional MRR and ARR.

Calculate gross and net burn rate by expense category. Enter monthly expense line items and MRR to get gross burn, net burn, cash efficiency ratio, and burn multiple — with a visual stacked breakdown showing where the money goes.

Calculate how many months of cash runway your startup has. Enter your bank balance, monthly revenue, and monthly expenses to get net burn rate, runway in months, a status rating, and a month-by-month cash projection chart.

Calculate Customer Acquisition Cost by channel. Enter marketing spend and new customers per channel to get blended and per-channel CAC, efficiency rankings, and a trend table to track how your CAC changes over time.

Generate full license text for MIT, Apache 2.0, GPL v3.0, LGPL, ISC, BSD 2-Clause, BSD 3-Clause, MPL 2.0, Unlicense, and CC0. Enter your name and year to get ready-to-use LICENSE file content instantly.

Convert SQL INSERT statements to a JSON array of objects. Paste one or multiple INSERT statements and get clean JSON ready for API testing, seeding, or migration.

Enter any IPv4 CIDR to see full subnet details (network address, broadcast, usable hosts, subnet mask, wildcard) and optionally split the network into N equal subnets. Outputs a complete table of subnet ranges for VLAN planning, cloud VPC design, and network segmentation.

Paste an OpenAPI 3.x or Swagger 2.0 spec, select any endpoint, and instantly get a realistic mock request body and response matching the defined schemas. Also generates a ready-to-run cURL command.

Calculate MoM, CAGR, and period-over-period revenue growth rates from a series of revenue figures. Get a visual growth rate chart, summary metrics, and a 3/6/12/24-month forward projection at your average or custom growth rate.

Calculate your Rule of 40 score by adding YoY revenue growth rate and EBITDA margin. See your tier (Elite / Healthy / Below Average), a visual gauge with the 40-point threshold, benchmark comparison against public SaaS companies, and a what-if table showing what growth or margin improvement is needed to reach 40, 50, or 60.

Calculate CSS clamp() values for fluid font sizes that scale smoothly between viewport breakpoints. Enter min/max font size and viewport widths to get a ready-to-use font-size declaration.

Parse, validate, and format .env environment variable files. Detects invalid KEY=VALUE entries, duplicate keys, and invalid characters — outputs a clean deduplicated file ready to use.

Generate nginx server block configurations for static sites, reverse proxies, and PHP-FPM setups. Includes SSL best practices, gzip compression, security headers, and upstream blocks — updated in real time as you change options.

Generate Cache-Control, Vary, and ETag headers for web and API responses. Select a caching strategy (public, private, no-cache, no-store), set browser and CDN TTLs, and configure advanced directives like stale-while-revalidate. Outputs ready-to-use snippets for nginx, Express.js, and Apache.

Validate docker-compose.yml syntax, service definitions, networks, volumes, and environment variables. Catches YAML errors, broken depends_on references, missing image/build, invalid restart policies, and more — with context-aware hints.

Validate canonical URL format and check for common implementation errors. Flags missing HTTPS, query parameters, fragments, uppercase paths, and other issues that cause canonicals to be ignored by search engines.

Design and compare SaaS pricing tiers visually. Define plan names, monthly and annual prices, feature inclusions, and CTA text — then preview a live pricing table, copy it as embeddable HTML, and estimate MRR with a conversion rate and plan distribution calculator.

Generate .env.example template files by building a list of environment variables with types, descriptions, and placeholder values. Paste an existing .env file to sanitise it into a safe template automatically. Copy or download the result instantly.

Convert text between UTF-8, Latin-1 (ISO-8859-1), Windows-1252, and ASCII encodings. View hex byte representation and see which characters are lost in conversion. Runs entirely in your browser.

Validate Kubernetes YAML manifests for syntax errors and required field completeness. Checks Deployments, Services, Ingress, ConfigMaps, Secrets, PVCs, HPAs, CronJobs, and more — with per-document results and fix hints.

Paste any JSON payload to instantly see its raw byte size, minified size, and real gzip estimate. Field-by-field breakdown sorted by largest contributor helps you find what to trim first.

Convert SVG markup to base64 data URLs for inline CSS background images and HTML embedding. Choose between base64 or URL-encoded output and copy the ready-to-use CSS url() or HTML img src.

Generate CSS Flexbox layout code by interactively toggling flex-direction, flex-wrap, justify-content, align-items, and item properties. See a live preview update instantly and copy the ready-to-use CSS.

Generate a .gitignore file by selecting any combination of programming languages, frameworks, IDEs, and operating systems. Merges official gitignore templates with section headers and lets you copy or download the result instantly.

Generate CSS Grid layout code by configuring columns, rows, gaps, and optional named area assignments. Set column and row sizes using any valid CSS values, toggle named grid areas, and get copy-ready CSS with a live layout preview.

Generate ASCII and Unicode box-drawing tables from CSV or TSV data. Choose from 6 border styles including Unicode single/double lines, classic ASCII, Markdown, PostgreSQL, and minimal. Ready for terminal output, README files, and documentation.

Remove unnecessary SVG elements, attributes, comments, and whitespace to reduce file size. Choose from Basic, Standard, or Aggressive optimization presets and download the result.

Generate tsconfig.json configurations for Node.js, React (Vite), Next.js, and library projects. Toggle strict mode, path aliases, and decorator support — every option includes an inline comment explaining what it does.

Paste two versions of any code file to instantly see what changed. Line-level diff with added, removed, and unchanged lines highlighted in green and red. Switch between side-by-side split view and unified diff view.

Calculate and compare specificity scores for CSS selectors using (a b c) notation. Enter multiple selectors to see which one wins the cascade and why.

Paste Markdown text and instantly get Slack-ready mrkdwn. Converts headings, bold, italic, strikethrough, code blocks, links, and lists to the correct Slack syntax. Free and runs in your browser.

Enter any regular expression and get a token-by-token plain-English breakdown. Understand anchors, character classes, quantifiers, groups, and more — with live match testing against sample strings.

Paste any package.json to instantly validate required fields, check semver version ranges in dependencies, and flag script name issues. Catches missing name/version fields, invalid semver ranges, and unpinned wildcards.

Generate properly formatted conventional commit messages by selecting a type (feat, fix, chore…), entering a scope and description, and optionally adding a body, breaking change footer, and issue reference.

Paste your HTML meta tags and instantly preview how your page appears on Twitter (X), LinkedIn, and Facebook. Highlights missing and suboptimal OG tags with fix recommendations.

Generate valid JSON-LD markup for Article, Product, FAQ, BreadcrumbList, and Organization schemas. Fill in the fields, copy the script tag, and paste it into your page head to enable Google rich results.

Calculate semantic version bumps (major, minor, patch, pre-release), parse and validate semver strings, compare two versions, and check whether a version satisfies a range expression (^, ~, >=, hyphen). All calculations run in your browser.

Convert Tailwind CSS utility class names to their equivalent plain CSS property declarations. Supports responsive breakpoint prefixes (sm:, md:, lg:) and state variants (hover:, focus:, dark:).