PDF Utilities

Protect PDF

Encrypt your PDF documents with a secure password locally in your browser. Complete client-side security.

Protect PDF

Encrypt your PDF with user and owner passwords locally in your browser.

Drag & drop your PDF file here or browse

Supports single PDF files (up to 80MB)

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What is this tool?

Protect PDF encrypts document streams using RC4 or AES algorithms. This prevents unauthorized users from opening, printing, or copying the file contents.

How to use it

1. Select and upload your PDF file.

2. Enter a secure password to restrict viewing.

3. Optionally, configure an owner password to block editing/printing.

4. Click "Encrypt & Protect PDF".

5. Save your secure, password-locked PDF document.

Pro tips

  • Use a strong password combining uppercase, lowercase, numbers, and symbols to ensure protection against brute-force attacks.
  • Note down your password carefully, as it cannot be recovered if forgotten.

Frequently asked questions

What is the difference between open password and owner password?

An Open (User) Password is required to open and view the PDF document. An Owner (Permissions) Password is required to modify restrictions like printing, copying text, or editing.

Is it safe to enter my confidential passwords here?

Yes, 100%. The encryption runs entirely inside your browser using local web crypto wrappers. Your password and PDF data never touch any server.

Can I remove the password later?

Yes! You can remove the password at any time using our Unlock PDF tool, provided you know the original password.