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Many publishers also publish a supplementary HTML version these days, which may be an acceptable format or at least easy to convert to other formats with pandoc.
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- I ended up using Grobid, which converts the PDF to a very detailed XML format. The format is not a word processing format though, but a format specifically for representing scientific documents. I don't know, if it would, for example, contain tags about bold or italicized text. The tool is working really well, but since you probably cannot use the output XML format directly, it will need some postprocessing, which would be relatively simple with XML parsing libraries.
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- An alternative is pdfextract by Crossref. They probably use this to build their own large database. It also works really well and gives you some JSON that would probably need less postprocessing than Grobid. I didn't use it for some minor technical reason that I forgot.
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- pdffigures2 is from the team behind Semantic Scholar, and they probably use it to extract the figures that they show in their search engine. It only extracts figures and their captions and no other things. I don't recall whether the other tools can also extract figures, but if not, then this will be a perfect supplement.
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- Another alternative that's on my list but that I didn't try is Cermine.
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Their library is built on Grobid and probably makes it easier to use, and thus probably the best overall choice.
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