Developer Tools · 2026-06
4coders
tiny tools, big grin
A fast, offline, keyboard-first developer toolbox — Base64, hashing, JWT, QR codes and more. Everything runs client-side; nothing is ever uploaded.
Live at 4coders.net
About the project
4coders is a free set of focused developer utilities that run entirely in your browser. Encode and decode Base64/URL/HTML/Hex, inspect JSON and JWTs, hash with MD5/SHA/CRC32, generate UUIDs and passwords, and create QR codes and barcodes. A ⌘K command palette jumps to any tool. After the first load the tools keep working offline — ideal for air-gapped or privacy-sensitive work.
Highlights
- Encode / decode: Base64 (incl. URL-safe), URL, HTML entities, Hex, Binary, Base32, ROT13, Morse
- Inspectors: JSON format/minify, JWT decode (never verified server-side), timestamps, text diff
- Hashing: MD5, SHA-1/256/384/512, CRC32 — all at once with compare
- Generators: UUID v4, CSPRNG passwords; QR + common linear barcodes (SVG/PNG download)
- Keyboard-first ⌘K palette, live updates, works fully offline after first load
Screenshots
