Password protect a PDF
Encrypt your PDF with a password: no one can open it without it. Ideal before sending a sensitive document.
Drop your files here
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🔒 Processed on your device, never uploaded
∞ Unlimited: no limit on file size or number of files
Files ready Done
Preview
How can I password-protect a PDF?
Add the PDF to Lunyce, choose a password and confirm it, then download the file encrypted with AES 256-bit, which all recent readers can open. Nobody can view it without the password. Neither the document nor the password is ever sent: everything stays on your device, for free and without an account.
How to
- Add your PDF.
- Choose a password and confirm it.
- Start, then download the protected PDF.
Frequently asked questions
Which encryption is used?
AES 256-bit encryption, the strongest available for PDFs, readable by all recent readers. The password is never sent: it stays on your device.
Are my files uploaded to a server?
No. Processing happens entirely in your browser, on your device. No file is uploaded or stored. You can check: once the page has loaded, disconnect from the internet and the tool still works.
Is there a file size or number limit?
No. Since nothing goes through our servers, there is no quota. The only limit is your device's memory: a computer handles very large files more easily than a phone.
Is it really free?
Yes. No sign-up, no watermark added to your documents and no usage limit.