Developer Tools
Browse 15 free browser-based utilities for formatting, encoding, hashing, diffing, converting, and generating data. Every tool runs locally — your input never leaves your device.
Password Generator
Secure random passwords
URL Encode/Decode
Percent-encode strings
JavaScript Beautifier/Minifier
Format and minify JS
Timestamp Converter
Unix ↔ ISO ↔ human
JSON Formatter
Format, validate, minify JSON
Text/JSON Diff
Side-by-side diff
Base64 Encode/Decode
Encode and decode Base64
Crontab Generator
Validate and human-readable cron
YAML ↔ JSON
Bidirectional conversion
Regex Tester
Test regular expressions
UUID Generator
Generate UUID v4
CSS Beautifier/Minifier
Format and minify CSS
JWT Parser
Decode and inspect JWT tokens
Hash
SHA256, SHA512 hashing
Lorem Ipsum
Placeholder text
Tool Categories
Formatters & Beautifiers — Clean up messy code and data for readability. The JSON Formatter, JavaScript Beautifier, and CSS Beautifier all support both pretty-printing and minification.
Encoders & Decoders — Convert data between representations. Base64 and URL Encoder handle the two most common encoding schemes developers encounter daily.
Security & Hashing — The Hash Generator computes SHA-256 and SHA-512 digests, while the Password Generator creates cryptographically secure random passwords.
Inspection & Debugging — Decode JWT tokens, test regex patterns, compare text with the Diff tool, and convert Unix timestamps.
Generators & Converters — Create UUIDs, generate Lorem Ipsum placeholder text, build cron expressions, and convert between YAML and JSON.
How to Use
Click any tool above to open it. Paste or type your input, and results appear instantly — no submit button needed for most tools. Use the Ctrl Shift K command palette to jump between tools without leaving the keyboard.
Many tools support shareable URLs: click “Copy link” to generate a URL that pre-fills your input, making it easy to share results with teammates in pull requests, chat, or documentation.