Secure PDF

Password Protect a PDF File

Add a layer of protection to your PDF before sharing — entirely in your browser.

  • Browser-based processing
  • No signup required
  • Free forever
🔒

Drag & drop your PDF here

How It Works

  1. Upload your PDF

    Drag and drop or browse to select the file you want to protect.

  2. Set a password

    Enter and confirm your password, then choose printing and copying permissions.

  3. Download protected file

    Your PDF is flattened to images for basic protection — ready to share securely.

What to Do Next

Sign the PDF Add your signature before protecting Add a watermark Mark as confidential

Your Files Stay Private

How does browser-based processing work?

This tool uses pdf-lib and PDF.js, open-source JavaScript libraries, running entirely in your browser. Your PDF is rendered to images and rebuilt as a new document locally. No network requests are made during processing, and your password is never transmitted.

Frequently Asked Questions

Is it safe to protect my PDF here?

Yes. Your file and password never leave your browser. All processing is performed locally using JavaScript — no uploads, no servers, no third parties involved.

Is this full encryption?

This creates a flattened copy of your PDF as images, which prevents easy text extraction and editing. Full PDF encryption with password protection requires server-side processing, which this browser-based tool cannot provide.

Can others still print the protected file?

The flattened format limits editability but doesn't restrict printing at the PDF level. For full permission controls, a dedicated PDF encryption tool is needed.

Is there a file size limit?

No hard limit. Processing happens in your browser, so it depends on your device's available memory. Note that flattening to images may increase file size.

Does this work on mobile?

Yes. The tool works in any modern browser on phones, tablets, and desktops.