EPUB Cover Adder

The tool ingests an EPUB file and a cover image, validates input formats, and embeds the cover as the designated EPUB cover artifact within the EPUB container. It updates the EPUB's manifest and metadata so readers and library catalogs display the correct cover during discovery and reading. This workflow is useful for self-publishers, editors, and cataloging teams preparing titles for distribution on stores and library systems.
Conceptually, the process unwraps the EPUB, injects a new or updated cover item into the manifest, adjusts the metadata to reference that item, and repackages the archive back into a standards-compliant EPUB. It adheres to EPUB 3 packaging rules, ensuring compatibility with modern e-readers and metadata schemas.
The tool benefits authors, publishers, and distributors by reducing manual steps, improving consistency of covers across platforms, and minimizing retracing steps if a cover needs changes later. It supports JPEG or PNG covers and preserves existing content, text, and media while applying precise modifications to cover handling.
Core features include input validation, optional cover resizing, safe replacement of existing covers, metadata preservation, and an integrity check that confirms the output is a valid EPUB with an embedded cover ready for deployment.