Back to Error DirectoryW3C EPUBCheck Standard
OPF-057Critical Ingestion Error

Image file length exceeds recommended size.

Image file length exceeds recommended size.

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Fix all OPF-057 errors in your EPUB automatically

PreFlight checks for OPF-057 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 length exceeds recommended size.. 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 OPF-057: Image file length exceeds recommended size.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule OPF-057 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the OPF-057 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.