Browse Developer Tools
JSON Formatter
Format, validate, and prettify JSON data with syntax highlighting and error detection.
JSON to TOON Converter
Convert JSON to TOON (Token-Oriented Object Notation) and back. Optimize tokens for Large Language Model prompts.
CRON Expression Generator
Build and validate CRON expressions with human-readable descriptions and examples.
Timestamp Converter
Convert Unix timestamps to human-readable dates with timezone support and batch processing.
Color Converter
Convert colors between HEX, RGB, HSL, HSV, CMYK, and OKLCH formats with decimal precision and live preview.
Favicon Generator
Generate favicon files from any image. Create ICO, PNG, and webmanifest for all devices and browsers.
SVG to EPS Converter
BETAConvert SVG vector graphics to EPS (Encapsulated PostScript). Paths, shapes, transforms, and colors — fully client-side.
Base64 Encoder/Decoder
Encode and decode Base64 strings quickly and easily with real-time conversion.
URL Encoder/Decoder
Encode and decode URLs for safe transmission with multiple encoding modes and batch processing.
Text Diff / Comparison Tool
Compare text files side-by-side with highlighted differences and merge capabilities.
Markdown Table Formatter
Tidy up markdown tables with aligned columns and clean separator rows for readable documentation.
Hash Generator
Generate secure hash values using multiple algorithms including SHA-256, MD5, bcrypt, and more with performance monitoring.
QR Code Generator
Generate QR codes from text, URLs, and data with customizable size and format.
Color Palette Generator
Generate beautiful color palettes with hex, and RGB values.
RegEx Tester
Test and debug regular expressions with live matching.
Why Use DevTools?
DevTools is a free collection of online developer utilities built for speed and privacy. Whether you need to format and validate JSON, encode or decode Base64 and URLs, generate UUIDs, create strong passwords, or convert Unix timestamps, every tool works instantly — no sign-up, no installs, and no limits.
Every tool runs entirely client-side in your browser. Your data is never uploaded to a server, logged, or stored, which makes DevTools safe for sensitive inputs like JWT tokens, passwords, and private JSON payloads. Because there are no server round-trips, results are generated in real time, even for large, multi-megabyte inputs.
From formatters and encoders to generators, converters, and analyzers, DevTools brings the everyday utilities developers reach for into one fast, reliable place — and the same tools are available as an MCP server for Claude, VS Code, and other AI assistants.
Explore Tools by Category
Formatters & Analyzers
Format, validate, and inspect your data. Beautify and validate JSON, align Markdown tables, decode and verify JWT tokens, generate SHA-256, MD5, and bcrypt hashes, and compare text or code with a line-by-line diff.
Encoders & Decoders
Encode and decode data safely. Convert text to and from Base64, escape and unescape URLs, and switch between standard and URL-safe formats — all processed locally in your browser.
Generators
Generate the values you need on demand: cryptographically secure passwords with strength scoring, UUID v1, v4, and v7, CRON expressions, Lorem Ipsum placeholder text, and favicons from any image.
Converters
Convert between formats instantly. Turn Unix timestamps into human-readable dates across timezones, convert colors between HEX, RGB, HSL, and OKLCH, and convert JSON to TOON to save tokens on LLM prompts.
Frequently Asked Questions
Are these developer tools free to use?
Yes, every tool on DevTools is completely free with no sign-up, no account, and no usage limits. You can format JSON, encode Base64, generate UUIDs and passwords, convert timestamps, and more as often as you need.
Is my data safe? Where is it processed?
All tools run 100% client-side in your browser. Your JSON, passwords, tokens, and other inputs never leave your device or get uploaded to a server, so your data stays private and secure.
What developer tools are available?
DevTools includes a JSON formatter and validator, Base64 encoder/decoder, URL encoder/decoder, password generator, UUID generator (v1, v4, v7), CRON expression generator, timestamp converter, Lorem Ipsum generator, color converter, text diff tool, Markdown table formatter, JWT debugger, hash generator, and a favicon generator.
Do I need to install anything or create an account?
No installation and no account are required. Every tool works instantly in your browser. The same tools are also available as an MCP server for Claude, VS Code, and other AI assistants if you prefer to use them in your AI workflows.
Can these tools handle large inputs?
Yes. The tools process data in your browser and are optimized to handle large inputs efficiently, from multi-megabyte JSON files to bulk UUID or password generation, with real-time results.
Are my results stored or logged anywhere?
No. Because processing happens entirely on the client side, nothing you enter or generate is stored, logged, or transmitted. Closing or refreshing the page clears everything.