Protect PDF
Lock a PDF with a password using AES encryption, locally.
Runs on your device · no upload
Loading tool…
About Protect PDF
Protect PDF adds a password to your document so only people with the password can open it. You can also block printing, copying and editing. Your file is encrypted on your own device.
1
Add your PDF
Choose a file from your phone or computer. It never leaves your device.
2
Adjust and run
Pick your options, then tap the main button.
3
Download
Save the result. No watermark, no sign-up.
Frequently asked questions
Can I recover a forgotten PDF password?
No. Keep the password safe, because it cannot be recovered.
Is the encryption strong?
Yes. The PDF is encrypted with AES, the standard used by modern PDF readers.
Are my files uploaded anywhere?
No. This tool runs in your browser, so your file stays on your device and is never sent to a server.