Password protect a PDF
Lock a PDF so it needs a password to open. AES-256, in your browser.
I want to
my PDF.
Runs on your device. Your file is not uploaded. Choose several to batch them.
Works well with Protect PDF
Explore all Secure tools- Compress PDFReduce the file size of your PDF, with control over image quality.
- Sign PDFDraw, type or upload your signature and place it on a PDF.
- Redact PDFPermanently black out and remove sensitive text and areas from a PDF.
- Watermark PDFStamp text or an image over your PDF pages, choosing position and opacity.
- Unlock PDFRemove the open password from a PDF when you know the current password.
- Digital signatureSign a PDF digitally with your own certificate file (P12 or PFX).
Ready to sign it?
Sign PDF adds your signature, initials and date on this device. Request signatures sets signers, order and an audit trail.
Runs in your browser, so your file is not uploaded.
Also searched as: password protect pdf, encrypt pdf, lock pdf, add password to pdf, protect pdf with password.
Questions
What if I forget the password?
We never see or store it, so it can't be recovered. Keep it somewhere safe.
Can I share a protected PDF by email?
Yes. Attach it as usual and send the password another way, such as a text message or a call.
Are my files uploaded?
Runs in your browser, so your file is not uploaded.
Is Protect PDF free?
Yes. No signup and no watermark.
Will it work on an old phone?
Yes for most files. On low-memory phones files up to 20 MB are safest; above your device's limit you get a warning and can try anyway.
Does it work on Mac, Windows, iPhone and Android?
Yes. It runs in any current browser, so there is nothing to install on any of them.