6 file types you can upload to ChatGPT that are far more useful than PDFs

PDF has become the default answer to “how do I get this into ChatGPT,” even when the original file would preserve far more useful structure. PDF is designed primarily to preserve a document’s fixed appearance. Although well-made PDFs can contain tags and logical structure, exports often flatten spreadsheets, slide decks, and other working files into pages that are harder to analyze reliably. Tables can lose clear column relationships, multi-column text may emerge in the wrong order, and formulas disappear behind their displayed values.

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