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Protect PDF

Encrypt your PDF with a password entirely in your browser. No server uploads.

100% BROWSER-BASED

Click to upload PDF

Select a PDF file

/ HOW TO USE

How to Use Protect PDF

This tool runs entirely in your browser. Upload your file, make your changes, and download the result. Your files never leave your device — everything is processed locally for maximum privacy.

/ FEATURES

Key Features

100% Client-Side Processing
No File Size Limits
Completely Free
Privacy Focused
Instant Results
Works Offline
/ USE CASES

Common Use Cases

  • —Secure confidential documents with password protection
  • —Prevent unauthorized access to sensitive files
  • —Add security before sharing contracts or agreements
  • —Protect intellectual property in PDF format
/ FAQ

Frequently Asked Questions

How secure is the password protection?

We use industry-standard PDF encryption (AES-256). Your password is never stored or transmitted - all encryption happens locally in your browser.

Can I remove the password later?

Yes, use our Unlock PDF tool if you have the password.

/ YOUR PRIVACY

Your Privacy is Guaranteed

Unlike other tools that upload your files to servers, ToolBox processes everything locally in your browser.

No server uploads
Instant processing
Works offline