Back to Error DirectoryW3C EPUBCheck Standard
MED-004Retailer Warning

Image file header may be corrupted.

Image file header may be corrupted.

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Fix all MED-004 errors in your EPUB automatically

PreFlight checks for MED-004 issues in memory and provides 1-click remediation during client-side packaging.

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What This Error Means in Plain English

EPUBCheck detected Image file header may be corrupted.. Digital reading systems and bookstores require standard conformance to ensure compatibility across all reading apps.

Why Retailers & EAA Regulations Block This File

Automated book distributors (Apple Books, Amazon KDP, Kobo, and IngramSpark) run strict EPUBCheck validation on ingest and reject non-compliant files.

Technical Specification: W3C EPUBCheck rule MED-004: Image file header may be corrupted.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule MED-004 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the MED-004 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.