Payslips, contracts, medical reports: anything you wouldn't want opened by the wrong person deserves a password before it leaves your inbox. Lock PDF encrypts your file locally with AES-256, the same standard banks and government systems rely on.
The encryption runs through your browser's built-in Web Crypto API using your chosen password. Nobody, including us, ever sees that password. It never leaves your device.
Freelancers sending invoices with bank details, HR teams distributing payslips, anyone emailing a document with a name, ID number, or financial figure attached benefits from locking it before it leaves the outbox.
AES-256, via the browser's native Web Crypto API. It's a widely trusted, industry-standard algorithm.
No. A file locked here needs the matching password entered through our Unlock PDF tool. It's not a standard encrypted-PDF format that generic readers understand.
No, the whole process happens locally in your browser.
There's no way to recover the file. No backdoor, no master key. That's exactly what makes the encryption worth anything in the first place.