Developer Tools
Free developer utilities: format JSON, encode and decode Base64, generate UUIDs and secure hashes, and convert timestamps. Fast, offline-capable and privacy-first.
12 developer tools
Format, encode, hash and decode.
JSON Formatter
Format, validate and minify JSON instantly.
Base64 Encode / Decode
Convert text to and from Base64.
UUID Generator
Generate random v4 UUIDs in bulk.
Hash Generator
Create SHA-1, SHA-256, SHA-384 and SHA-512 hashes.
Unix Timestamp Converter
Convert between Unix time and human dates.
URL Encoder / Decoder
Percent-encode and decode URL components.
Password Generator
Create strong, random passwords instantly.
JWT Decoder
Decode and inspect JSON Web Tokens.
Regex Tester
Test regular expressions against text live.
Password Strength Checker
Estimate how strong a password is.
Markdown Preview
Write Markdown and see it rendered.
Color Contrast Checker
Check WCAG contrast between two colors.
Frequently asked questions
Yes. Every tool is completely free, with no sign-up and no usage limits.
Tools run in your browser wherever possible, so your data stays on your device.
No installation is required — everything works instantly in your web browser.