11 tools
Security Tools
Hashing, encoding, and everyday crypto utilities.
Hash Generator
Generate a SHA-256 hash of any text, entirely in your browser.
UUID v7 Generator
Generate time-ordered UUID v7 values directly in the browser.
UUID Validator
Validate UUID strings and confirm their shape in the browser.
NanoID Generator
Generate compact NanoID values for applications and test data.
ULID Generator
Generate sortable ULID strings entirely in the browser.
JWT Decoder
Decode JWT header and payload segments directly in the browser.
JWT Inspector
Inspect JWT claims and explain common values like expiry.
JWT Expiration Checker
Check whether a JWT is expired or still valid.
HMAC Generator
Generate an HMAC signature using a secret and message.
Password Generator
Generate secure passwords with a configurable length.
Password Strength Checker
Rate the strength of a password and explain the result.
About security tools
Hashing, encoding, and everyday crypto utilities. These tools run locally in your browser, so you can use them for quick checks during development without sending data anywhere.
FAQ
Are security tools tools free to use?
Yes — every tool on U5F is free, with no account required.
Is my data uploaded anywhere?
No, processing happens locally in your browser tab.