Developer Toolbox
All in One Place

Format, beautify, validate and minify JSON online for free. Features syntax highlighting, tree view, history tracking, and one-click copy. No signup required. 100% client-side processing for privacy.

Unescape JSON online or escape raw JSON strings instantly. Decode quotes, backslashes, newlines, and Unicode in API responses, logs, and nested JSON locally.

Compare two JSON files side by side and highlight differences instantly. Find additions, deletions, and changes in nested JSON objects. Free online tool.

Convert JSON to CSV format online for free. Transform JSON arrays into CSV spreadsheet format instantly. No signup required, 100% client-side processing for privacy.

Convert CSV to JSON format online for free. Transform CSV spreadsheet data into JSON arrays instantly. No signup required, 100% client-side processing for privacy.

Generate JSON Schema from any JSON data instantly. Supports Draft 04, 06, 07, 2019-09, and 2020-12. Auto-detect types, formats, and required fields. Free, no signup, 100% client-side.

Convert JSON to TypeScript interfaces, Go structs, Python dataclasses, Java classes, Rust structs, and C# classes. Free online tool with instant code generation. No signup required.

Convert JSON to TypeScript interfaces instantly. Free online tool to generate strongly-typed TypeScript types from JSON data. Perfect for API responses and type definitions. No signup required.

Convert JSON to Go structs instantly. Free online tool to generate Go struct definitions with json tags from JSON data. Perfect for API development and data modeling. No signup required.

Test JSONPath expressions online for free. Evaluate queries against JSON data with real-time results. Supports wildcards, recursive descent, filters, and array slicing. No signup required.

Free online text analyzer tool. Count words, characters, sentences, paragraphs. Calculate reading time, speaking time, and analyze word frequency. All processing happens in your browser.

Free online case converter tool. Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and more. Instant text transformation.

Free online slug generator tool. Create SEO-friendly URL slugs from any text. Supports custom separators, transliteration, and batch processing. Perfect for blog posts, articles, and web pages.

Free online duplicate line remover tool. Remove duplicate lines from text, find duplicates, sort output. Supports case-insensitive comparison and whitespace trimming. All processing in browser.

Free online regex tester and debugger. Test regular expressions with real-time match highlighting, group capture display, and replacement preview. Supports JavaScript, Python, and PCRE patterns.

Free online SQL formatter and beautifier. Format, beautify, and minify SQL queries with proper indentation. Supports MySQL, PostgreSQL, SQLite, Oracle, and more database syntax.

Free online color picker and converter tool. Convert between HEX, RGB, HSL, HSV color formats instantly. Generate color palettes, pick colors visually, and copy color codes with one click.

Free code diff online and text comparison tool. Compare two texts line by line, word by word, or character by character, and instantly highlight additions, deletions, and edits.

Free online Markdown editor with real-time preview. Write and preview Markdown instantly, export to HTML or download as .md file. Supports tables, code blocks, and all standard Markdown syntax.

Free online JavaScript formatter and minifier. Beautify, format, and compress JS code instantly. Supports ES6+ syntax with customizable indentation options.

Free online CSS formatter and minifier. Beautify, format, and compress CSS code instantly. Clean up stylesheets with customizable indentation options.

Free online code diff tool to compare two code snippets with syntax highlighting. Supports 20+ programming languages. Find differences instantly with GitHub-style diff view.

Free online HTML formatter and beautifier. Format, beautify, and minify HTML code with customizable indentation. Syntax highlighting, instant preview. Essential tool for web developers.

Free online XML formatter and beautifier. Format, beautify, and minify XML code with customizable indentation and XML validation. Syntax highlighting, error detection. Essential for developers.

Free online number to words converter. Convert numbers to English words, ordinal numbers, and currency format. Supports large numbers up to quintillions.

Compress image files online with our image compressor. Reduce image size while maintaining good quality. Supports JPEG, PNG, GIF, WEBP and other formats, with batch processing up to 100 images at once.

Free online image to JPG converter. Convert PNG, WebP, GIF, BMP, TIFF to high-quality JPG format. Batch conversion supported, adjustable quality settings. 100% browser-based, no upload required.

Free online batch image resizer. Resize multiple JPG, PNG, WebP images at once by dimensions or percentage. Maintains aspect ratio, supports custom sizes. 100% browser-based, no upload required.

Best free online image cropper tool. Crop photos to custom sizes and aspect ratios (1:1, 4:3, 16:9, 9:16) in seconds. Perfect for profile pictures, thumbnails, social media posts. No download, no signup — works in any browser.

Easily add text or image watermarks to your photos online. Protect your images with customizable watermarks. No uploads required, completely free and secure.

Convert PNG, JPG, and other images to scalable SVG vector graphics online. Batch convert up to 100 files with custom settings. Free, no signup required.

Free online PNG to JPG converter. Convert PNG images to high-quality JPG format with adjustable compression. Batch conversion, no file limits. 100% browser-based, secure and private.

Free online JPG to PNG converter. Convert JPG/JPEG images to PNG format with lossless quality and transparency support. Batch conversion, no file limits. 100% browser-based, no upload required.

Free online WebP to JPG converter. Convert WebP images to widely-compatible JPG format with adjustable quality. Batch conversion, no file limits. 100% browser-based, secure and private.

Convert SVG to PNG online for free. High-quality SVG to PNG conversion with custom scale settings. Perfect for creating raster images from vectors. 100% secure, local browser processing.

Free online image to Base64 encoder. Convert JPG, PNG, WebP images to Base64 strings, Data URI, HTML img tags, or CSS background code. Perfect for embedding images directly in code.

Free online Base64 to image decoder. Convert Base64 strings and Data URIs to downloadable images. Supports PNG, JPG, WebP output formats. Instant preview, no upload required.

Create animated GIF images from multiple pictures online. Upload images, set frame delay and loop count, preview animation, and download your GIF. Free online GIF creator tool.

Free online SVG optimizer tool. Compress and optimize SVG files to reduce file size while maintaining quality. Remove unnecessary metadata, comments, and optimize paths.

Free online image collage maker. Combine multiple images into one with horizontal, vertical, or grid layouts. Customize spacing and background color. No uploads required, completely free and secure.

Compress PDF files online to reduce their size without losing quality. Our PDF compressor offers various compression levels for optimal file size reduction, making it easy to share and upload documents.

Merge multiple PDF files into one document online for free. Our PDF merger allows you to combine PDFs easily, reorder pages, and create a single, organized PDF file. No registration required.

Split PDF documents into multiple files or extract specific pages with our free online PDF splitter. Easily separate PDF pages, extract pages from PDF, or divide your PDF into custom ranges.

Free online image to PDF converter. Convert JPG, PNG, WebP images to PDF documents. Batch upload multiple images into a single PDF. 100% browser-based, no upload required, privacy protected.

Free online PDF to JPG converter. Convert PDF pages to high-quality JPG images with adjustable quality and scale. Batch export all pages, no file size limits. 100% browser-based, secure and private.

Free online Base64 encoder and decoder. Encode text and images to Base64, decode Base64 to text and images. Supports UTF-8, file to Base64, data URI generation. Fast, secure, and easy to use.

Easily encode and decode URLs with our free online tool. Convert special characters for safe web transmission (percent-encoding) or decode them back to a readable format. Fast, simple, and reliable.

Free online MD5 hash generator. Generate MD5 checksum instantly in 32-bit and 16-bit formats. Perfect for file integrity verification, data validation. Fast, secure, no signup required.

Generate secure JWT secret keys and bearer tokens online for free. Create, decode, and verify JSON Web Tokens with HS256/HS384/HS512 algorithms. Cryptographically strong key generation for production use.

Generate hash values instantly with our free online tool. Supports MD5, SHA-1, SHA-256, SHA-512, SHA-384, SHA3, RIPEMD-160 algorithms. Calculate hashes for text and files. Fast, secure, and easy to use.

Generate and verify bcrypt test hashes locally in your browser with an adjustable cost factor from 4 to 16. Inspect the encoded version, cost, salt, and checksum.

Generate strong, secure random passwords instantly with our free online tool. Customize length, character types, and generate multiple passwords at once. 100% client-side, your data never leaves your browser.

Free online HTML entity encoder and decoder. Convert special characters to HTML entities for safe display in web pages. Encode or decode HTML entities instantly.

Convert text to ASCII codes, Unicode code points, hexadecimal, binary, and HTML entities. Includes ASCII table reference. Free online tool, no signup required.

Convert length, mass, temperature, area, volume, speed, time, binary storage, pressure, energy, power, and force units locally with explicit display rounding.

Convert numbers between different bases including Binary, Octal, Decimal, Hexadecimal, Base32, Base58, and Base62. Supports arbitrary precision conversion.

Convert XML to JSON format instantly with our free online tool. Supports complex XML structures with attributes, nested elements, and arrays. 100% client-side processing for complete privacy.

Convert JSON to XML format instantly with our free online tool. Generate well-formatted XML from JSON data with proper indentation. 100% client-side processing for complete privacy.

Convert YAML to JSON format instantly with our free online tool. Supports complex YAML structures with nested objects, arrays, and multi-line strings. 100% client-side processing for complete privacy.

Convert JSON to YAML format instantly with our free online tool. Generate clean, human-readable YAML from JSON data. 100% client-side processing for complete privacy.

Convert JSON to TOON format to reduce LLM token consumption by up to 50%. TOON (Token-Oriented Object Notation) is optimized for AI/LLM input with compact tabular arrays. Free online tool with real-time token savings display.

Convert TOON (Token-Oriented Object Notation) back to standard JSON format. Parse LLM-optimized compact data into readable JSON. Free online tool with syntax validation and instant conversion.

Free online HTML to Markdown converter. Convert HTML code to clean Markdown format instantly. Supports GFM tables, code blocks, lists, and images. Perfect for blog migration and documentation.

Free online Markdown to HTML converter. Convert Markdown to clean HTML code with syntax highlighting, GFM tables, code blocks, and live preview. Perfect for developers and content creators.

Generate QR codes for free with our powerful online tool. Support for URLs, WiFi, vCards, email, phone numbers, and plain text. Customize colors, add your logo, and download in PNG or SVG format.

Generate RFC 9562 UUID v4 or time-ordered UUID v7 values locally in your browser. Create up to 1000 identifiers, change display formatting, copy, or download.

Generate and parse cron expressions online for free. Visual cron job scheduler with next execution times, syntax validation, and common presets. Perfect for Linux, Unix, and cloud scheduling.

Free online Lorem Ipsum generator to create placeholder text for your designs, mockups, and prototypes. Generate paragraphs, sentences, words, or lists instantly. No registration required.

Browse, search and copy emojis instantly with our free online emoji picker. Get Unicode, shortcodes, and HTML entities for any emoji. Supports Chinese and English search.

Free online random data generator to create fake names, emails, phone numbers, addresses, UUIDs, dates and more. Generate bulk test data instantly with JSON/CSV export. No registration required.

Free online geohash encoder and decoder tool. Convert latitude/longitude to geohash string, decode geohash to coordinates with interactive map visualization. Adjustable precision 1-12, display 8 neighbors. Perfect for spatial indexing, proximity search, and location-based app development.

Free online timestamp to date converter. Instantly convert Unix epoch timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, and nanoseconds with both GMT and local timezone. Batch conversion available.

Free online world clock tool to view current time in multiple cities worldwide. Add timezones, calculate time differences, and track daylight saving time. Essential for travelers and remote teams.

Look up any IP address to find its geolocation, ISP, timezone, and network information. Detect your own IP address instantly. Free online tool, no signup required.

Free online DNS lookup tool. Query A, AAAA, CNAME, MX, NS, TXT, SOA, PTR records for any domain using Google DNS. Instant results, no signup required. Debug DNS issues easily.

Free online text to binary and hexadecimal converter. Convert text to binary, binary to text, text to hex, and hex to text instantly. Supports Unicode and emoji.

Free online color format converter. Convert between HEX, RGB, HSL, HSV, and CMYK color formats instantly. Supports batch conversion, random generation, and an interactive color picker.

Calculate percentages easily with our free online percentage calculator. Find what percent of a number, percentage increase/decrease, and more. Fast, accurate, and easy to use.

Calculate your exact age in years, months, and days with our free online age calculator. Find out how many days until your next birthday. Fast and accurate.

Calculate tips and split bills easily with our free online tip calculator. Supports custom tip percentages, multiple people, and shows per-person amounts. Fast and accurate.

Calculate days between two dates or add and subtract days from any date. Supports business days calculation and excludes weekends. The best free online date calculator for developers.

Calculate your GPA (Grade Point Average) instantly with our free online calculator. Supports multiple grading scales including 4.0, 5.0, and percentage systems. Perfect for students.

Calculate fractions easily with our free online fraction calculator. Add, subtract, multiply, and divide fractions. Simplify fractions and convert between fractions, decimals, and percentages.

Calculate your daily calorie needs with our free online calorie calculator. Determine calories for weight loss, maintenance, or muscle gain based on your activity level and goals.

Free online body fat percentage calculator using US Navy method and BMI formula. Enter height, weight, waist, neck measurements to calculate body fat. Get insights into body composition and fitness goals.

Calculate compound interest and investment growth with our free online calculator. See how your money grows over time with different interest rates and compounding frequencies.

Calculate your Body Mass Index (BMI) instantly with our free online BMI calculator. Supports both metric and imperial units. Get health advice based on WHO and China standards.

Calculate your loan payments instantly with our free online loan calculator. Supports equal payment (amortization) and equal principal methods. View detailed repayment schedule with monthly breakdown.

An authoritative, comprehensive, and continuously updated AI resources directory. It covers global and domestic model providers, open-source ecosystems, research indexes and leaderboards, developer platforms, and curated tool catalogs—helping you quickly discover, compare, and choose the right AI products and references. Supports keyword search and favorites, with clear category sections and an expanding dataset for better experience.

A structured prompt engineering and inspiration directory: official best practices, community galleries and workflows, open-source lists and tools, marketplaces and template collections. Find high-quality references fast, build reusable prompt patterns, and boost productivity. Supports keyword search and favorites, with clear categories and ongoing expansion of top resources.

Comprehensive directory of MCP (Model Context Protocol) servers, SDKs, clients, and tools. Discover official implementations, community servers, and development resources for building AI-powered applications with Claude and other LLMs.

Comprehensive directory of AI agents, frameworks, platforms, and tools. Discover autonomous agents like AutoGPT, CrewAI, LangGraph, and explore the latest in AI agent development for automation and productivity.

Comprehensive directory of AI skills, rules, and resources. Find Cursor Rules, Windsurf Skills, Claude Projects documentation, community collections, and tutorials. Essential resource for AI coding assistant customization.