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Textor is a free iOS app that lets users easily create and edit plain text files in place from the Files app--a task that was a hassle.
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.
PDF documents are great for ensuring that recipients see a document formatted the way it was intended, and for making it relatively difficult - but by no means impossible - to muck around with the ...
If you keep on changing TextEdit from rich text mode to plain text each time you open the app, here's how you can change the default settings in the often-used text-editing tool.