PDF Tools
PDF Password Protect
Add a password to a PDF so only the holder can open it.
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About this tool
Add an open password to a PDF. The encrypted PDF requires the password in any standard reader (Acrobat, Preview, browsers). You can also pick which actions are allowed without the owner password — printing, copying, modifying, etc.
Frequently asked questions
Which encryption is used?
AES-256 (PDF 2.0) when supported by the source document, falling back to AES-128. The encrypted PDF is compatible with Adobe Acrobat, Preview, and browser PDF viewers.
Is my password sent anywhere?
No. Encryption happens in your browser — the password never leaves your device.
Can I lose access to a forgotten password?
Yes. There is no backdoor. Save the password somewhere safe — without it the file cannot be opened.