A focused set of browser-based utilities for everyday development work — formatting, encoding, hashing, and testing. Everything runs locally in your browser, so your code and data never leave your device. No accounts, no uploads, no limits.
15 free tools · browser-based · no sign-up
Which developer tool fits your task?
| I need to… | Use |
|---|---|
| Format or validate JSON | JSON Formatter |
| Convert between JSON and CSV | JSON ↔ CSV |
| Encode or decode Base64 | Base64 |
| Inspect a JWT payload | JWT Decoder |
| Generate a checksum / hash | Hash Generator |
| Build and test a cron schedule | Cron Generator |
| Test a regular expression | Regex Tester |
| Create a UUID | UUID Generator |
Password Generator
Strong or pronounceable passwords, in bulk.
Open tool →UUID Generator
UUID v1, v4, v6, v7, Nil, Short ID, Nano ID.
Open tool →Hash Generator
MD5, CRC32, SHA-1/256/384/512, SHA-3, file hashing.
Open tool →JSON & XML Formatter
Format, validate, tree view, JSON↔XML, YAML, CSV.
Open tool →XML Formatter
Validate, minify, XPath, XML ↔ JSON.
Open tool →Regex Tester
Live highlighting and common presets.
Open tool →SQL Formatter
Pretty-print, leading commas, stats.
Open tool →JSON ↔ CSV Converter
Nested flattening, 4 delimiters.
Open tool →JWT Decoder
Decode header, payload, expiry — 100% local.
Open tool →Base64 Encoder / Decoder
Text, files, images, URL-safe, data-URI.
Open tool →URL Encoder / Decoder
Encode, decode, edit query parameters.
Open tool →YAML Converter
YAML ↔ JSON, validate structure.
Open tool →Cron Generator
Visual builder, plain English, next 10 runs.
Open tool →Code Minifier
CSS, JS, HTML, JSON, XML — strip & shrink.
Open tool →Code Beautifier
Pretty-print CSS, JSON, XML, JS, SQL.
Open tool →