Protect PDF

Encrypt your PDF with a password to prevent unauthorized access.

Select PDF File

or drag & drop PDF here

About Protect PDF Online

Secure your PDF documents by encrypting them with a password online.

Select the PDF file you want to lock with a password.

Type in a strong password to lock the file.

Download the encrypted PDF which now requires the password to open.

Your files are processed locally in your browser. No data is uploaded to our servers.

Processing runs instantly using local WebAssembly, bypassing server queues.

All PDF tools are accessible for free without watermark, limits, or registration.

Encryption runs locally on your machine using standard PDF security algorithms. We do not store or see your password.

Once protected, the file cannot be viewed without entering the correct password.