Developer Tools
Formatters, encoders, validators and generators for developers.
Popular
JSON Formatter
Beautify, minify and validate JSON with syntax feedback.
JSON Validator
Validate JSON and pinpoint syntax errors instantly.
PopularBase64 Encode
Encode text or files to Base64.
Base64 Decode
Decode Base64 back to readable text.
TrendingJWT Decoder
Decode and inspect JSON Web Token header and payload.
PopularUUID Generator
Generate v4 UUIDs, single or in bulk.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes.
Regex Tester
Test regular expressions with live match highlighting.
HTML Formatter
Beautify and indent messy HTML markup.
CSS Minifier
Minify CSS to reduce file size.
JS Minifier
Minify JavaScript to reduce file size.
SQL Formatter
Format and indent SQL queries for readability.
Code Beautifier
Beautify HTML, CSS and JS in one place.
URL Encode
Percent-encode text for safe use in URLs.
URL Decode
Decode percent-encoded URL strings.
HTML Entity Encoder
Encode and decode HTML entities.
Color Contrast Checker
Check WCAG contrast ratio between two colors.
Cron Expression Parser
Explain a cron expression in plain English.
Are these Developer tools free?
Yes, every Developer tool on Toolzy is 100% free with no watermarks, no limits and no account required.
Do I need to sign up or install anything?
No. All 18 Developer tools run in your browser, nothing to download, install or register for.
Are my files and data private?
Most tools process your data entirely on-device in your browser, so nothing is uploaded. Where a file must be processed on the server, it is sent over HTTPS and deleted right after.