23 free developer tools, no signup

Formatters, converters, encoders, and everyday utilities — all free, all instant, nothing stored.

Formatters

JSON Formatter

Format, validate, and minify JSON

XML Formatter

Format and minify XML

SQL Formatter

Format messy SQL statements

HTML Formatter

Format and minify HTML

CSS Formatter

Format and minify CSS

JavaScript Formatter

Beautify or minify JavaScript

Converters

YAML ↔ JSON

Convert YAML to JSON or back

CSV ↔ JSON

Convert CSV to JSON or back

Encoders

Base64 Encoder/Decoder

Encode or decode Base64

URL Encoder/Decoder

Percent-encode or decode text

HTML Entity Encoder/Decoder

Encode or decode HTML entities

Developer

JWT Decoder

Inspect a JSON Web Token

SSL Certificate Decoder

Check a live domain or decode a pasted certificate

SSL Certificate Converter

Convert certificates between PEM, DER, PKCS#7, and PKCS#12

SSL Certificate & Key Matcher

Check whether a certificate and private key belong together

Favicon Checker

Check a domain's favicon, apple-touch-icon, and manifest icons

Regex Tester

Test a regex against text live

Diff Checker

Compare two blocks of text

Cron Expression Generator

Describe and preview cron schedules

General

Timestamp Converter

Convert Unix timestamps to dates

UUID Generator

Generate random UUIDs

Password Generator

Generate a strong random password

Color Converter

Convert HEX, RGB, and HSL colors