4 tools
Validators
Check that emails, credit card numbers, UUIDs and passwords are well formed before you rely on them.
Free forever · nothing uploaded · no signup
- Credit Card ValidatorCheck a card number with the Luhn algorithm.
- Email ValidatorCheck whether an email looks valid.
- Password Strength CheckerEstimate password strength.
- UUID ValidatorCheck if a UUID is valid.
- 1
Nothing is uploaded
Every tool on this page runs inside your browser tab. Your files are read from disk into memory and never sent anywhere.
- 2
No account, no cap
No signup, no email, no daily limit, no watermark, and no paid tier waiting behind the third file.
- 3
Keeps working offline
Load the page once and it still works with the network off, which is the clearest proof that nothing was ever being uploaded.