Development

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

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.

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.

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.

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.

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.

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.

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

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

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.

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.

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.

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.

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.

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.

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 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.

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.

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.

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.

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.

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.

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

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.

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.

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 .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.

Generate .eslintrc.json configurations for JavaScript and TypeScript projects. Pick Airbnb, Standard, or Google style guide — with React and Prettier support — and get a ready-to-use config with the exact npm install command.

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.

Validate git commit messages against the Conventional Commits specification. Paste one or more commits to check type, scope, and description format — errors and warnings shown per line with fix suggestions. Supports custom types and git log --oneline output.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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 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.

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.

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

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

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.

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.

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

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.

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.

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.

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

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.

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 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.

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

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.

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.

Test string templates with real variable values across 7 syntax styles: JS ${var}, Python {var}, Mustache {{var}}, printf %s, Shell $var, Ruby #{var}, and Windows batch %var%. Paste your template, enter variables, and see the rendered output instantly.

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.

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

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 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.

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

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:).

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.

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.

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.

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.

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

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.

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.

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

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.

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

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

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.

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

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

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.