Are my files uploaded to a server?

No. This tool runs entirely in your browser — your files never leave your device, which makes it fast and completely private.

Can you recover my password if I forget it?

No — the PDF is encrypted on your device and we never see it or the password. If you lose the password, the file can't be opened, so store it somewhere safe.

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Protect PDF

Add a password to a PDF.

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How to use the Protect PDF

1Drop your PDF into the box.
2Enter a password (and confirm it).
3Click Protect PDF and download your encrypted file.

About the Protect PDF

Free PDF password protector — encrypt a PDF with a password so only people you share it with can open it. Runs entirely in your browser, no upload, no watermark.

Part of our PDF Tools collection. Browse all tools.

Frequently asked questions

Are my files uploaded to a server?: No. This tool runs entirely in your browser — your files never leave your device, which makes it fast and completely private.
Can you recover my password if I forget it?: No — the PDF is encrypted on your device and we never see it or the password. If you lose the password, the file can't be opened, so store it somewhere safe.