DevToolKit
Free online tools for developers. No sign-up, no tracking — everything runs in your browser.
Data
Security
Generators
Why DevToolKit?
DevToolKit provides a collection of free, browser-based developer utilities. Every tool runs entirely in your browser — no data is sent to any server, ever. Your code, tokens, and data stay private.
Whether you need to format JSON, decode a JWT token, generate UUIDs, test regular expressions, convert timestamps, or compare text — DevToolKit has you covered with instant, reliable tools.
Built by developers, for developers. No sign-up required. No tracking. No ads interrupting your workflow. Bookmark it and use it every day.
Available Tools
JSON Formatter & Validator — Format, beautify, minify, and validate JSON data online with customizable indentation.
YAML ↔ JSON Converter — Convert between YAML and JSON formats instantly. Supports nested objects, arrays, and comments.
Base64 Encoder/Decoder — Encode text to Base64 or decode Base64 strings. Full UTF-8 support.
JWT Decoder — Decode and inspect JSON Web Tokens. View header, payload, and expiration info without any server.
URL Encoder/Decoder — Encode or decode URL components and query parameters with Unicode support.
Hash Generator — Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text using the Web Crypto API.
UUID Generator — Generate random UUID v4 identifiers in multiple formats: lowercase, uppercase, no-dashes, and braces.
Regex Tester — Test regular expressions in real-time with match highlighting, group extraction, and flag support.
Unix Timestamp Converter — Convert Unix timestamps to human-readable dates and back. Includes a live clock.
Color Converter — Convert between HEX, RGB, and HSL color formats with a live color preview.
Lorem Ipsum Generator — Generate placeholder text in words, sentences, or paragraphs for your designs.
Text Diff Checker — Compare two texts side by side and see differences highlighted line by line.
Password Generator — Generate strong, secure random passwords with customizable length, characters, and complexity. Uses crypto.getRandomValues() for true randomness.
QR Code Generator — Create QR codes for URLs, text, Wi-Fi networks, email, and phone numbers. Download as PNG or SVG with custom colors and sizes.
SQL Formatter — Format and beautify SQL queries online. Supports MySQL, PostgreSQL, SQL Server, Oracle, SQLite, BigQuery, and more.