Password-Protect a PDF
Drop a PDF, set a password, and download a password-protected ZIP. Open it with any modern OS or 7-Zip.
Drop your PDF here
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FAQ
Why a ZIP and not native PDF encryption?
Browsers don't ship a battle-tested PDF encryption library. AES-256 ZIP encryption is a stronger, standards-based way to lock a file behind a password in the browser — and macOS, Windows, and 7-Zip all open it natively.
Is it really secure?
Yes, when you choose a strong password. AES-256 in zip.js is the same primitive used by 7-Zip.