ReadmeBuddy LogoReadmeBuddy
Developer Tools

Fast, free developer tools

Everyday utilities that run entirely in your browser — no signup, no uploads, no nonsense. Bookmark the ones you use daily.

Online Code Compiler

New

Write & run Python, JavaScript, C++, Java, Go, Rust and more — instantly, no setup.

Format & Validate

JSON Formatter

Beautify, minify & validate JSON

JWT Decoder

Decode JWT header & payload

Regex Tester

Test regex with live matches

Encode & Decode

Base64 Encoder / Decoder

Encode & decode Base64 text

URL Encoder / Decoder

Percent-encode & decode URLs

Convert

Cron Expression Explainer

Translate cron to plain English

Unix Timestamp Converter

Epoch ↔ human date, both ways

Generate

UUID Generator

Generate v4 UUIDs in bulk

Hash Generator

SHA-1, SHA-256, SHA-384 & SHA-512

More tools shipping regularly. Got a request? Tell us.