Protect PDF - Private, Free, No Upload

Drop a PDF to protect

Add a password and control who can do what

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Network uploads during this session

0 (verify in DevTools > Network)

File size limit

None (browser memory)

Output watermark

None

Frequently asked

How strong is the encryption?

AES-256 - the industry standard used by banks and governments.

Can I restrict what users do?

Yes. Toggle printing, copying, editing, and annotation independently.

Is my password sent anywhere?

Never. It's applied to the PDF in your browser and then discarded. Not even we know it.

What's the difference between user and owner password?

User password opens the file. Owner password controls permissions. Set either or both.

Can I protect an already-encrypted PDF?

Unlock it first (see our Unlock tool), then re-protect with new settings.