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Supported EPUB files

For the best results, use a standard, DRM-free EPUB with a valid table of contents and readable text chapters.

Requirements

  • File extension: .epub
  • Media type: EPUB
  • Maximum upload size: 50 MB
  • Valid EPUB ZIP structure
  • At least one readable section

Unsupported or problematic files

The app may reject:

  • encrypted or DRM-protected books;
  • corrupt or incomplete EPUB archives;
  • files with unsafe archive paths;
  • EPUBs with invalid metadata or no readable sections;
  • another format renamed to .epub.

When a book does not open

Try opening the EPUB in another reader first. If it also fails there, obtain a fresh copy from the publisher or export the source document as EPUB again.