Free Developer Tools
Client-side utilities for frontend engineers — no account, no data sent to servers.
JSON Formatter & Validator
Pretty-print, minify, and validate JSON in the browser.
Open tool →JWT Decoder
Decode JSON Web Token headers and payloads locally — no server upload.
Open tool →URL Encode / Decode
Encode or decode URLs and query strings for APIs and redirects.
Open tool →Unix Timestamp Converter
Convert epoch seconds or milliseconds to human-readable dates and back.
Open tool →Base64 Encode / Decode
Encode or decode text and UTF-8 strings locally.
Open tool →UUID Generator
Generate v4 UUIDs instantly — bulk copy for test data.
Open tool →SHA-256 Hash Generator
Hash text with SHA-256 using Web Crypto — client-side only.
Open tool →Secure Password Generator
Cryptographically strong passwords with custom length.
Open tool →Regex Tester
Test regular expressions with match highlighting.
Open tool →Text Diff Checker
Compare two text blocks line-by-line for code and config reviews.
Open tool →CSV to JSON Converter
Turn comma-separated data into JSON arrays for APIs and tests.
Open tool →HEX / RGB Color Converter
Convert between hex, RGB, and CSS color values.
Open tool →HTML Entity Encoder
Encode or decode HTML entities for safe markup and XSS prevention.
Open tool →Word & Character Counter
Count words, characters, and reading time for content.
Open tool →Meta Tag & SERP Preview
Preview how title and description appear in Google search results.
Open tool →Cron Expression Helper
Build and explain cron schedules for job runners.
Open tool →React Bundle Size Estimator
Estimate gzip JS bundle impact from dependencies and route count.
Open tool →