Password Protect PDF

About Password Protect PDF

This tool adds password protection to your PDF files directly in your browser. You can set a user password (required to open the PDF) and an owner password (required to change permissions). All encryption happens locally - your files are never uploaded to any server.

What is the difference between User and Owner passwords?

User Password (Open Password) is required to open and view the PDF. Owner Password (Permissions Password) controls what actions are allowed, like printing, copying, or editing. You can set one or both passwords.

What encryption is used?

This tool uses AES-256 encryption, which is the industry standard for PDF security. It provides strong protection that is recognized by all major PDF readers.

Can I set permissions without requiring a password to open?

Yes! You can set only an Owner Password to restrict actions like printing or copying, while still allowing anyone to open and view the PDF.

What permissions can I control?

You can control: Printing, Copying content, Modifying the document, Adding annotations, Filling forms, and Document assembly (inserting/deleting pages).

Is my PDF file safe?

Absolutely! All encryption happens directly in your browser using pdf-lib. Your PDF file is never uploaded to any server. Everything stays private on your device.

Can I remove password protection later?

To remove password protection, you'll need to open the PDF with the correct password in a PDF reader that supports removing encryption, such as Adobe Acrobat.

What is the maximum file size?

The maximum file size is 100MB. This ensures smooth performance in your browser.

Will this work with all PDF readers?

Yes! The encryption used is compatible with all major PDF readers including Adobe Acrobat, Chrome, Firefox, Edge, Preview (Mac), and most mobile PDF apps.