Protect PDF

Add password protection to your PDF using PDF encryption.

Drop a PDF or click to upload
Single PDF
PDF encryption is applied via the pdf-lib library. For maximum security, use a strong password with mixed characters.

About Protect PDF

Protect PDF uses pdf-lib password options to create an encrypted copy with a chosen password and permissions.

How to Use Protect PDF Online

  1. Upload a PDF.
  2. Enter a password twice and choose the available permission preset.
  3. Select Protect PDF.
  4. Open the downloaded file and test the password before deleting the source.

100% Client-Side Privacy

Files process in local browser memory via WebAssembly. Your documents are never uploaded to remote servers.

Supported Input

One PDF and a password

Output Result

An encrypted PDF

Practical Pro-Tip

Use a unique, long password and store it securely.

Need Visual Step-by-Step Guidance?

Explore our complete walkthrough for Protect PDF with full interface screenshots, option reference, and troubleshooting FAQs.

Read Protect PDF Guide

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Created by @officialhazim42 · Free forever · No sign-up · No uploads to server