Password protect PDF

Here’s how to add a password to your PDF document.

How to password protect a PDF

It’s also called an open password, because others can’t open the file without knowing this password.

We’ll use Sejda PDF’s toolset for editing PDF files to password protect pdf.

  1. Open with your favourite browser the password protect PDF file page
  2. Drag your PDF files onto the page
  3. Type a password. Choose a strong password
  4. Click Encrypt PDF and then Download your protected PDF file. 

After that try to open the result and confirm that the open password works.

How do you lock a PDF from editing?

One way to do that is by setting PDF permissions on the document. This will make it harder (but not impossible) for others to edit your document.

How do you secure a PDF file?

By setting an owner password, which prevents others that don’t know the password from changing the PDF document permissions.

How to add security permissions to a PDF document

Here’s how do to it, in few easy steps, The same page where we show how to password protect a pdf allows setting PDF permissions as well.

Click More options and Select all permissions that you want others to have on your document. By default none as selected (most secure, most restrictive).


Here’s the available permissions:

  • Modifying - Modify the contents of the document by operations other than those controlled by other permissions.
  • Copying text or graphics - Copy or otherwise extract text and graphics from the document, including extracting text and graphics.
  • Printing - Print the document (possibly not at the highest quality level, depending on whether ‘High Resolution Printing’ is also selected).
  • High resolution printing - Print the document to a representation from which a faithful digital copy of the PDF content could be generated. When this permission is not selected and only 'Printing’ permission is, printing is limited to a low-level representation of the appearance, possibly of degraded quality.
  • Filling forms - Fill in existing interactive form fields (including signature fields).
  • Commenting - Add or modify text annotations, fill in interactive form fields, and, if 'Modifying’ permission is also selected, create or modify interactive form fields (including signature fields).
  • Insert, rotate or delete pages - Assemble the document (insert, rotate, or delete pages and create bookmarks or thumbnail images), even if 'Modifying’ permission is not selected.

You should know that these permissions are not enforced by all PDF readers, so they are not 100% safe.