Protect PDF: what it is and how to use it
Protect PDF: Add a password to your PDF. Fast and free in your browser.
June 22, 2026 · 2 min read
Protect PDF: what it is and how to use it
What is Protect PDF?
PDF password protection adds an open password to reduce casual unauthorized reading—common for personal data or trade secrets. CodeGrid Tools aims to apply encryption steps in your browser so the protected output is produced without the file following a typical upload-to-remote-server path. Strong passwords remain your responsibility. Free daily allowances and Pro are described on the pricing page. This guide explains when Protect PDF helps and how to run it step by step in CodeGrid Tools.
When is it useful?
- Add a password to your PDF
- Runs in your browser—no extra software required
How to use it in CodeGrid Tools
Step 1: Select PDF
Upload the file you want to protect.
Step 2: Enter Password
Type the opening password and confirm it.
Step 3: Download
Save the encrypted PDF to your device.
Tips
- Use an up-to-date browser (Chrome, Edge, Firefox, or Safari).
- Large files may take longer depending on your device.
FAQ
What happens if I forget the password?
The password stays only with you; the platform does not store or recover it. Keep it in a safe place.
Can I change existing password protection?
This tool is designed to add a new user password. Protected PDFs opened in another application must first be unlocked there.
Is 256-bit encryption available?
PDF encryption is applied with pdf-lib by adding a user password, using the standard PDF security model for compatibility.
Use Protect PDF →