Development Tools

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

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

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

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.

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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.

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

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

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

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

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

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.

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.

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

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

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

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.

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

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.

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

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.

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.

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

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.