If you want to extract highlighted text from PDF file as a plain text file, then this post covers some good free PDF Highlight Extractor software to do that.

Learn how to enable and use PDF editing tools in Firefox PDF reader. You can use Free Text Annotation tool and Ink Annotation tool in Firefox.

After exploring the offerings for each tool, PDF24 Creator is easily the best free option around right now. Having tested out ...

To see alt text in a completed PDF document, you'll need to use a screen reading app, which is an accessibility tool for visually impaired users.

Quick tip: You can also sign a PDF document on any device, without the need for a printer or scanner. Here's how to type on a PDF, whether you're using a Mac, PC, mobile device, or Microsoft Word.

With other file formats that have text, it is usually easy to copy or export the content to plain text — for example, to quote it in another text. This is not the case with PDF.