20 Free Online Developer Tools

Simple, fast tools that run entirely in your browser. No sign-up. No tracking. Your data never leaves your device.

Most Popular JSON Formatter — try it here

Formatted JSON will appear here...

🤔 What does this mean? Decode JWT · Format SQL · Test Regex · Check EXIF

📝 Formatters

{ } JSON

Format, validate & minify JSON

SQL

Beautify SQL queries

HTML Entity

Encode/decode HTML special chars

CSS/JS/HTML Minifier

Compress code, strip comments

🔐 Encoders & Decoders

Base64

Encode/decode Base64 text

URL Encoder

URL-encode & decode strings

JWT Decoder

Decode & inspect JWT tokens

🛠️ Generators

UUID

Generate UUID v4 in bulk

Password

Generate strong random passwords

QR Code

Create & download QR codes

Mock Data 🆕

Generate fake users, addresses, companies, APIs

📊 Converters

CSV ↔ JSON

Convert CSV to/from JSON

Color Converter

HEX / RGB / HSL converter

Markdown Preview

Write & preview markdown

Timestamp

Unix time ↔ date converter

🔍 Testers & Diff

Regex Tester

Real-time regex matching

Diff Checker

Compare text side by side

📖 References

HTTP Status Codes

Complete status code reference

Cron Parser

Parse cron schedules, see next runs

🔒 Privacy

📸 EXIF Viewer

See & remove hidden photo metadata