How to Write Notes on PDF Files. The Sticky Note tool in Adobe Acrobat and Adobe Reader allows for commenting on your business PDF files. The tool can display notes in multiple colors and styles ...

How to Write Something in a PDF File and Save. The ability to change and save changes to PDF files lets you fill out the PDF forms on which your business depends. Lacking these basic functions ...

If you are wondering how to annotate a PDF on Windows, you can use free online tools and software that we have included in this article.

To write on a PDF on Android, open the PDF file in the Adobe Acrobat Reader: Edit PDF app, and tap on the Text icon. Select where you want to input new text and type away.

You can edit a PDF on your Mac with Preview, an app that's built-in to your computer from the start. You can use this program to edit photos, too.