Password Protect PDF Files — Secure, Fast & Free

Easily add a strong password to your PDF documents to secure them from unauthorized access. Encrypt sensitive files instantly, right in your browser.

Open Encryptor How it works
Pro tip: Use a strong, unique password that includes letters, numbers, and symbols.
Processed
+1,800,000 files
Rating
4.8/5 (1840+)

Lock PDF — Tool

Use the widget below to upload your PDF and set a secure password. The operation runs in-browser.

Files processed in your browser — we don’t store your files or passwords.

How to Password Protect a PDF — Step by Step

Follow these simple steps to add a password to your PDF file in seconds.

  1. Open the widget — click “Open Encryptor.”
  2. Add file — drag & drop your PDF.
  3. Set Password — Enter a secure password.
  4. Confirm Password — Re-type to confirm.
  5. Protect — click the "Lock" button.
  6. Download — get your password-protected PDF.

Why choose this PDF Locker?

Privacy-first

All encryption happens in your browser — files and passwords are never stored on our servers.

Strong Encryption

Uses standard, robust PDF encryption for real protection.

No installs

Works instantly in any browser. No software needed.

Simple Interface

A clean "upload, set password, download" workflow that takes seconds.

Frequently Asked Questions

Ready to secure your PDF?

Add a password to your sensitive documents in seconds — privacy-first and completely free.

Protect Your PDF Now