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OneFileConverter
PDF

Password-protect a PDF

Lock a PDF with industry-standard AES-256 encryption so only people with the password can open it.

Formats
PDF
Max size
500 MB
Price
Free

Drop files here

or browse your device

PDF · up to 500.0 MB per file

Related tools

Unlock PDFRemove the password from a PDF you can open.Watermark PDFStamp text like CONFIDENTIAL or DRAFT on every page.Compress PDFShrink PDFs — or hit an exact size like 1 MB.

How to password-protect a PDF

  1. Add your PDF.
  2. Choose a password and permissions.
  3. Click Protect and download the encrypted PDF.
Are my files safe?

Yes. Your files are only used to create your result — they’re never shared and never used to train AI.

What if I forget the password?

It can't be recovered — that's what makes the encryption strong. Keep a copy of the original.

Do the printing and copying settings stop everyone?

Only the open password is enforced by encryption. Printing and copying restrictions are stored in the PDF and honoured by mainstream readers such as Acrobat, Preview and Chrome, but some software ignores them.