Developer Tools
Formatters, encoders, generators and testers for everyday development work — all client-side.
15 free toolsJSON Formatter & Validator
Format, validate and minify JSON instantly.
Subnet Calculator
IP subnet math: network, broadcast, and host ranges
Base64 Encoder/Decoder
Encode text to Base64 or decode it back.
Regex Tester
Test patterns live, free.
UUID Generator
Generate v4 and v7 UUIDs in bulk, right in your browser.
MD5 & SHA Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.
URL Encoder & Decoder
Encode or decode URLs and URI components instantly.
JSON to CSV Converter
Convert JSON to CSV instantly — nested objects, custom delimiters, live preview.
Markdown to HTML Converter
Markdown to clean HTML with live preview.
Color Contrast Checker
WCAG contrast ratio with AA/AAA pass-fail verdicts.
CSS Gradient Generator
Linear, radial & conic gradients with copy-ready CSS.
Image to Base64 Converter
Images to base64: data URI, HTML tag & CSS snippet.
DNS Lookup Tool
Look up A, MX, TXT and more DNS records for any domain instantly.
JWT Decoder
Decode JWT header, payload, expiry — verify HS256 signatures.
Cron Expression Generator
Build cron schedules visually, decode them too.