PDF Protect
Free online tool to password-protect PDF files
256-bit encryption, lock documents in one click
Free online tool to
password-protect PDF files
256-bit encryption, one click
Drop your PDF file here
or
Max file size: 100MB
Password-protect PDF
256-bit encryption
Free, no sign-up
256-bit encryption
Industry-standard AES encryption keeps your PDF fully protected.
Privacy by default
Encrypted in transit and handled securely.
Done in seconds
Add a password to your PDF before the kettle boils.
Custom permissions
Control what users can do: allow or block printing, copying, and editing.
Any device, any OS
Works on any device - no installs, no plugins.
100% free
No signup, no watermarks, no hidden fees, just protect and go.
How it works
1
Upload your PDF by dragging it in or choosing from your device.
2
Set a password and choose permissions to block.
3
Click Protect and we encrypt your PDF in the cloud.
4
Download your protected PDF or grab a shareable link.
PDF Protect FAQs
Use at least 7 characters with a mix of uppercase, lowercase, numbers, and symbols. Avoid simple passwords like "password123". A strong password keeps your document truly secure.
We use 256-bit AES encryption, the same standard trusted by banks and governments. Breaking it with a regular computer would take thousands of years.
The PDF cannot be opened without the password. We do not store your password, so there is no way to recover it. Make sure to save it somewhere safe.
Barely. The file size increase is usually just 1 to 2 kilobytes, so you will not notice any difference.
Yes. Set a user password to require a password to open the file, and an owner password to control printing, copying, and editing permissions. Also try PDF Unlock to remove restrictions later.
Yes. Use only an owner password to block printing, copying, or editing without requiring a password to view the document.
Your files are encrypted in transit and handled securely. We never store your documents permanently.
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