A red and white logo features a check mark inside a square on the left, with the text "mobisystems" in lowercase red font to the right.
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Meet MobiPDF – formerly PDF Extra

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Securing PDFs - File protection settings

A curved, metallic blade rests horizontally against a plain, light gray background.

Accessing the security settings

To start protecting documents in MobiPDF, simply head over to “Home” → “Tools” → “Protect”

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If you’ve already opened a PDF file that you want to secure, you can also access this functionality from MobiPDF’s tool ribbon.

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If you’ve already opened a PDF file that you want to secure, you can also access this functionality from MobiPDF’s tool ribbon.