A free program for Android, by Knight Zone App.

This app allows you to convert all your document files into PDFs. You can add security watermarks, custom watermarks, and even the watermark of the country where the document was printed.

You can also add a logo or image to the watermark to make it more unique and attractive. You can add multiple logos or images to your document.

It is a free and easy-to-use app. You can scan to PDF in a few seconds and you don’t need to install anything else.

You can convert images into PDFs.