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Protect PDF

Lock a PDF with a password and AES-256 encryption — on your device.

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Lock a PDF with a password

Protect PDF encrypts your document with AES-256, so it can only be opened with the password you choose. You can also stop the file being printed or its text being copied. The encryption runs in your browser, which means the unprotected file is never sent anywhere.

  • Your files stay on your device

    Protect PDF runs in your browser, so nothing is uploaded — not the file, not even its name.

  • Free, with no sign-up

    No account, no watermark on your files and no daily limit for normal use.

  • Files up to 100 MB

    Large or scanned files are fine — they simply take a little longer.

  • Works on every device

    Windows, Mac, Linux, iPhone, iPad and Android, in any modern browser. Nothing to install.

Protect PDF, step by step

  1. 1

    Select your PDF.

  2. 2

    Type a password twice.

  3. 3

    Press Protect and download.

Good to know

AES-256, the strongest standard PDF encryption. The file can’t be opened without your password.

Yes. You can switch off printing and copying text. Most PDF apps respect these settings, though not every app enforces them.

It can’t be recovered — that is the point of strong encryption. Keep the password somewhere safe, or keep an unprotected copy.

Each file can be up to 100 MB. Large or scanned files simply take a little longer.

Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone, iPad and Android, with nothing to install. You can also add pdfconva to your home screen and open it like an app.

No. This tool runs entirely in your browser. Your files never leave your device.

Yes. Every pdfconva tool is free, with no sign-up and no watermark on your files.

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