Protect PDF
Encrypt a PDF with a password (AES-256) so it can't be opened without it.
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How it works
- 1.Select a PDF.
- 2.Choose a password and permissions.
- 3.Protect — this runs entirely in your browser.
- 4.Download the encrypted PDF.
Privacy
This tool runs entirely in your browser using a Web Worker. Your file is never uploaded to a server, and we never see its contents.
Questions
- What encryption does this use?
- AES-256, the current PDF standard for strong password protection. Your password never leaves your browser.
- What if I forget the password?
- There's no recovery — the PDF genuinely cannot be opened without it. Keep it somewhere safe.