Developer tool
Your files never leave your device
Check your Network tab and see
Work starts the moment you drop a file
No daily limit, no sign-up, no watermark
Do not paste live payment or production API secrets. Rotate anything you tested here if it was real.
UTF-8 via TextEncoder. Binary secrets as hex are not parsed — type the raw string.
SubtleCrypto is part of the browser, so the message and secret are signed locally and no request is made to any server.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.
MD5 for checksums plus SHA-1, SHA-256, and SHA-512 via Web Crypto — all in your browser, nothing uploaded.
Build unsigned or HS256 JWTs.
Decode JSON Web Tokens (JWT) safely to view header and payload without sending secrets to any server.
Generate strong, secure, and random passwords locally in your browser.
Encode to Base64 or decode from Base64 instantly in your browser.
Generate valid universally unique identifiers (UUIDs/GUIDs) instantly.
