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Password Protect a PDF

Lock a PDF with a password so only people who know it can open it. The file is encrypted with strong AES-256 entirely in your browser — nothing is uploaded, no account needed. Drop your PDF, choose a password, and download the protected copy.

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Frequently asked questions

No. Encryption runs entirely in your browser using qpdf compiled to WebAssembly. Your document and your password never leave your device — no upload, no account, no server.

The PDF is encrypted with 256-bit AES, the strongest standard supported by the PDF format. Anyone opening the file will be asked for the password you set.

There is no recovery. Because the encryption is real and the file never touches a server, a lost password cannot be reset — keep a copy of your original or store the password safely.

Yes. The password prompt works in Acrobat, Preview, Chrome, Edge and every standard PDF reader, since it uses the PDF format's built-in encryption.