Built for builders
Free Developer Tools Online
Fast utilities for developers: JSON formatter and validator, Base64 encoder and decoder, UUID generator, and more — all running locally in your browser.
21 live tools · 1 coming soon
Available tools
Choose a live utility below. Tools marked Coming Soon are listed separately.
JSON Formatter
Format, validate & beautify JSON
Open toolBase64 Encoder
Encode text or files to Base64
Open toolBase64 Decoder
Decode Base64 back to text or files
Open toolUUID Generator
Generate v4 UUIDs in bulk
Open toolJSON Validator
Strict JSON validator with errors
Open toolJSON to CSV
Convert JSON arrays to CSV files
Open toolCSV to JSON
Convert CSV to clean JSON
Open toolJWT Decoder
Decode JWT tokens client-side
Open toolURL Encoder
Percent-encode text for safe URLs
Open toolURL Decoder
Decode percent-encoded URLs back to text
Open toolUnix Timestamp Converter
Convert Unix timestamps and dates
Open toolRegex Tester
Test regular expressions in real time
Open toolSQL Formatter
Format and beautify SQL
Open toolHTML Formatter
Format & beautify HTML
Open toolCSS Minifier
Minify CSS for production
Open toolJavaScript Minifier
Minify JavaScript for production
Open toolHTML to JSX
Convert HTML to React JSX
Open toolColor Converter
Convert HEX, RGB, and HSL colors
Open toolDiff Checker
Compare two texts side by side
Open toolCron Expression Parser
Parse five-field cron schedules
Open toolUser Agent Parser
Parse browser user agent strings
Open toolComing soon
These tools are planned but are not available for use yet.