Protect PDF (Add Password)
PDF ToolsLock a PDF with a password (AES-256)
Embed this tool on your websiteFree
- Choose how tall the frame should be.
- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
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History
All history →Protect PDF (Add Password) — at a glance
Put a password on a PDF so only people who know it can open the file.
How to use it — step by step
A PDF file and the password you want to use.
Add a PDF
Choose the document you want to lock.
Type a password
Enter it twice. Choose whether printing, copying text and editing are allowed.
Press Protect PDF
The file is encrypted on your device with AES-256.
Download
Save the protected PDF and share it safely.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
How strong is the protection?+
It uses AES-256, the strongest encryption in the PDF standard. A good password is what makes it hard to break.
Can you recover a lost password?+
No. The file is locked on your device and we never see the password, so nobody can recover it for you. Keep a copy of the password.
What is the owner password?+
It is an optional second password for changing the printing, copying and editing limits. Most people can leave it empty.
Will it open in Adobe Reader, Chrome and phones?+
Yes. AES-256 PDFs open in current versions of Adobe Reader, Chrome, Edge, Firefox, Safari and the built-in phone viewers.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.