Protect PDF
Encrypt a PDF with a password. Nobody can open it without the password, including us.
- 100% freeNo sign-up needed
- Works in your browserNo upload to a server
- Secure and privateFiles stay on your device
Add your PDF files
Drop your files anywhere on this page, or choose them from your device.
- Processed on your deviceNothing is uploaded
- No file size limitUse as much as you need
- No waitingNo upload or download step
- Safe and privateYour files never leave your device
How to password protect a PDF
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Add a file
Add your PDF.
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Set a password
Type a password, then type it again to confirm.
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Protect and download
Select Protect PDF and download the encrypted file.
Lock a PDF with a password
Add a password to a PDF before you email or share it. The file is encrypted with AES-256, the strongest protection the PDF format offers, and cannot be opened without the password. The encryption is done on your own device, so the unprotected document and the password never travel over the internet. Keep the password safe: nobody, including us, can recover it.
Good to know
Answers to common questions about Protect PDF.
How strong is the protection?
The file is encrypted with AES-256, the strongest encryption the PDF format supports. Its real strength depends on your password, so use a long one.
What if I forget the password?
It cannot be recovered. Your password never leaves your device and is not stored anywhere, so keep a copy somewhere safe.
Is my file uploaded anywhere?
No. Protect PDF runs inside your browser tab and your file never leaves your device. Close the tab and nothing remains.
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