Password Protect PDF
Encrypt PDF files with AES-256 so only people who know the password can open them, with no upload.
Processed on your device, not uploaded.
How to Password Protect a PDF
- 1
Select Your PDF Files
Several files can share one password.
- 2
Type a Password
Tap the eye icon to check the spelling.
- 3
Press Lock PDF
The document is locked with AES-256 encryption.
- 4
Download the Locked File
Download PDF, or Download ZIP for several files.
Protect PDF Features
AES-256 Encryption
The strongest encryption level the PDF format supports.
Password Required to Open
Without the right password, the document can't be read or printed.
Check the Password Spelling
The eye icon shows what you typed, so typos appear before locking.
Lock 20 PDFs With One Password
Protect many files at once with the same password in one ZIP.
Common Questions
Select the file, type a password, then press Lock PDF. Only people who know it can open the file.
A forgotten password can't be recovered, and Unlock PDF also needs the correct one.
Yes, encryption runs in your browser, so the document and password aren't sent to a server.
Yes, in modern PDF reader apps on phones and computers, using the password you share.
Open it with Unlock PDF using the old password, then protect it again with a new one if needed.
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