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BUZZ NEXTERS TOOLS
Runs on your device

Protect PDF

Add a password to a PDF with strong AES-256 encryption. Encryption runs in your browser; the password is never sent anywhere.

Choose a file or drop it here

Click to browse · PDF · up to 200 MB

Runs in your browser: your files and data never leave your device.

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What is Protect PDF?

Protecting a PDF encrypts its contents so it can only be opened with a password.

How to use Protect PDF

  1. 1

    Choose your PDF.

  2. 2

    Enter and confirm the password, and set permissions if you want.

  3. 3

    Click Protect PDF and download.

Features

  • AES-256 encryption
  • Optional owner password
  • Printing, copying, editing and annotation permissions
  • Runs locally with qpdf

Supported formats

  • PDF

Maximum file size: 200 MB per file.

Practical uses

  • Send payslips or medical reports securely.
  • Share contracts that only recipients can open.
  • Restrict printing of drafts.

Limitations

  • If you forget the password, the file can't be recovered.
  • Permission restrictions are honored by most readers but aren't enforced by all software.

Frequently asked questions

How strong is the encryption?

AES-256, the strongest option in the PDF standard. Use a long, unique password.