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I need to convert a whole bunch of PDFs to some other file format (Doc, DocX, RTF etc), and then back to a PDF a little later.

I need to the new PDFs to look the same as far as possible.

Is there any difference between these file formats as to how lossy the conversion will be, or does it not really matter? What factors will make a difference?

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PDF is a page layout description format: It describes the general structure of the document, resources like fonts and embedded images, a tree of all pages, and possible other things. For each page, it contains commands to put certain glyphs into certain positions, or other image operations, like placing an embedded image.

The other three formats you mention (Doc, DocX, RTF) are Microsoft-specific "source" formats, which describes sequences of characters with attributes, and doesn't describe (at least in principle) the layout of these characters on visible pages.

So all conversion from PDF into any of these formats (and basically all formats you can sensibly edit) will be lossy. Very lossy.

If you put enough effort in the conversion, you may get an PDF back that resembles more or less the original PDF, but making it look the same is really, really difficult.

Bottom line: PDFs are not editable. Edit whatever was used to create the PDF. If you don't have access to that, tough luck. You can still try to edit the PDF directly, but that's also not easy.

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