Private by design
There is no backend. Input is processed by JavaScript on your device and is never uploaded or logged.
No sign-up · No tracking · Works offline
Developer tools that stay
in your browser.
Format JSON, encode data, hash strings, generate UUIDs and convert timestamps. Every operation runs locally — your data never leaves the page.
Open the toolbox ↓JSON formatter
Paste JSON to pretty-print, minify or validate it.
Ready.
Base64 encoder / decoder
UTF-8 safe. Works with text, JSON and URLs.
Ready.
URL encoder / decoder
Encode query values or decode percent-encoded strings.
Ready.
SHA-256 hash
Hashes are computed with the browser's Web Crypto API.
Ready.
UUID generator
Cryptographically random UUID v4 values.
Ready.
Timestamp converter
Convert between Unix time and a readable date.
Ready.
Fast and lightweight
A single page with no frameworks and no external requests. It loads instantly and works offline.
Always free
No accounts, no quotas and no paywalls. Bookmark the page and use it whenever you need it.