Copy text without formatting from PDF or other Rich Text source

I want to copy a text from a Rich Text source (like PDF, Word document, Notes taking app, etc), but without the formatting, so I can copy-paste like normal text.
 Most of the time when I copy text from PDF, it is copied with a lot if new lines, but I want to just make a list of technologies or quotes to use in my articles/documents. What is nice and quick way to copy formatted and paste as unformatted text, when there is no such option in the context menu?
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