DOCX, PPTX, XLSX and EPUB all start with the same magic bytes — auto-detect means asking the ZIP what it is
This story is from 2026-10-03. It is preserved in the archive; the latest stories are on the live feed.
When I added auto-detect to my universal document converter, I assumed file extensions and Content-Type headers would carry the weight. Both lied to me within the first week. A contract arrived named contract.pdf . The extension said PDF, the upstream header said application/pdf. My PDF parser chok…
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- 2026-10-03 19:33 · DEV Community — AI
DOCX, PPTX, XLSX and EPUB all start with the same magic bytes — auto-detect means asking the ZIP what it is