Free Online Developer Tools

Format, validate, and minify JSON data online. Supports tree view and syntax highlighting.

Encode and decode Base64 data online. Supports text and file encoding with full Unicode/CJK character support.

Encode and decode URLs online. Supports full URL encoding, component encoding, and query parameter parsing.

Encrypt and decrypt text using AES-256-GCM with PBKDF2 key derivation. All processing happens in your browser using Web Crypto API.

Generate SHA-256, SHA-384, SHA-512, SHA-1, and MD5 hashes online. Supports HMAC and file hashing.

Generate QR codes from text or URLs. Customize size, error correction, and colors. Download as PNG or SVG.

Decode and inspect JSON Web Tokens (JWT). View header, payload, and expiration status.

Generate random UUID v4 identifiers. Supports bulk generation and validation.

Convert between Unix timestamps and human-readable dates. Supports seconds, milliseconds, and ISO 8601.

Test and debug regular expressions in real-time. Match, replace, and validate patterns with preset templates.

Convert colors between HEX, RGB, and HSL formats. Includes color picker and preview.

Write and preview Markdown in real-time. Side-by-side editor with live HTML rendering.

Compare two texts side by side and find differences. Line-by-line diff with added, removed, and unchanged highlighting.

Convert images to PDF, merge multiple PDFs, or extract specific pages. All processing happens in your browser.

Convert images between JPG, PNG, and WebP formats. Batch processing supported. All conversions happen in your browser.

Compress images to reduce file size with adjustable quality. Compare before and after. All processing in your browser.

View and remove EXIF metadata from JPEG photos, including GPS location data. Protect your privacy without uploading files.

Resize images to exact dimensions or social media presets. Maintain aspect ratio with one click. All processing in your browser.

Count words, characters, sentences, paragraphs, and estimate reading time in real-time. Free online text analysis tool.

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more. 9 case formats supported.

Generate placeholder text by paragraphs, sentences, or words. Classic Lorem Ipsum with customizable options.

Generate strong, secure passwords with customizable length and character sets. Uses Web Crypto API for cryptographic randomness.

Convert JPG/JPEG images to PNG format online. Lossless conversion with transparency support. Free, fast, and private.

Convert PNG images to JPG format with adjustable quality. Reduce file size while maintaining visual quality. Free and private.

Convert PNG images to WebP format for smaller file sizes with excellent quality. Modern format supported by all browsers.

Convert JPG/JPEG images to WebP format for better web performance. Smaller files with comparable quality.

Convert WebP images to JPG format for maximum compatibility. Adjustable quality with instant conversion.

Convert WebP images to PNG format with lossless quality. Preserves transparency. Free online converter.

Convert iPhone HEIC/HEIF photos to JPG format. Batch conversion with adjustable quality. Free and private.

Convert text to ASCII art with multiple fonts, or transform images into ASCII characters. All processing in your browser.

Interactive Git command reference organized by situation. Search, filter by category, and copy commands with one click.

Format, validate, and minify XML data online. Auto-indent with error detection. 100% client-side processing.

Format and beautify SQL queries online. Supports MySQL, PostgreSQL, SQLite, and more. Customizable indentation and keyword casing.

Convert between JSON and YAML formats instantly. Bidirectional conversion with indent control. 100% client-side.

Convert JSON data to YAML format online. Clean output with customizable indentation. Free, fast, and private.

Convert YAML to JSON format online. Structured output with customizable indentation. Free, fast, and private.

Convert between CSV and JSON formats. Auto-detect delimiters, customizable options. Bidirectional conversion with statistics.

Convert CSV data to JSON format online. Auto-detect delimiters, header support. Free, fast, and private.

Convert JSON arrays to CSV format online. Customizable delimiters and header options. Free, fast, and private.

Transform plain text into stylish Unicode fonts — bold, italic, script, gothic, circled, and more. Copy and paste anywhere.