Protect PDF

Free

Add password protection and encryption to sensitive PDF documents.

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Drop PDF here or click to upload

Add password protection · 100% browser-based

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How to Use Protect PDF

  1. Upload PDF

    Drop or select the PDF you want to protect.

  2. Set password

    Choose a strong password and confirm it.

  3. Encrypt

    Click Protect — encryption happens in your browser.

  4. Download

    Get the password-protected PDF instantly.

Frequently Asked Questions

AES-256 encryption is applied via the qpdf library running in WebAssembly. This is the same standard used by Adobe Acrobat Pro.
No. Your password is used only in your browser to encrypt the file and is never sent or stored anywhere.
Your file becomes permanently inaccessible. We cannot recover passwords. Always save your password somewhere safe like a password manager.
Yes — open the protected PDF in any PDF reader with the password and re-save it without one, or use a PDF unlock tool.