Protect PDF

Upload your PDF file, enter your desired password in the password field, and click the protect button. The tool encrypts your PDF with AES-256 encryption instantly in your browser.

Yes, this PDF protection tool is completely free. There are no file size limits, no watermarks, and no registration required.

Absolutely. All processing happens locally in your browser using the MuPDF engine. Your PDF files and passwords never leave your device — no server uploads involved.

The tool uses AES-256 encryption, the same standard used by governments and security agencies worldwide. It is compatible with all major PDF readers including Adobe Acrobat.

Yes, you can use our PDF unlock tool to remove the password. You will need the original password to unlock the file.

Yes. The encrypted PDF follows the standard PDF specification and can be opened on any device with a PDF reader that supports password-protected files.

The tool applies open-password protection, which means the PDF requires a password to open. This prevents unauthorized viewing, printing, and copying.

Unfortunately, there is no way to recover a forgotten PDF password. The AES-256 encryption is designed to be unbreakable without the correct password. Please store your password safely.

You can protect one PDF at a time. Simply repeat the process for each file you want to secure.

Yes. Once the page loads, all encryption is performed locally in your browser. No internet connection is needed during the protection process.