EPUB Chapter Lab

About

EPUB Chapter Lab is a paid, local-first publication QA and repair workspace. Import a buyer-selected EPUB and inspect its container, package document, metadata, manifest, spine, navigation document, and chapter files. Review extracted chapter titles, file paths, previews, word counts, and reading order. Edit publication metadata, include or omit spine items, drag chapters into a new order, and generate a missing EPUB 3 navigation document. Source-level issues that cannot be repaired safely remain clearly identified instead of being silently changed. Export a repaired EPUB, a detailed chapter CSV, and a readable PDF audit packet from the same saved project. Duplicate a project before a production pass to preserve a revision. No login is required. The app has no subscription, in-app purchases, ads, analytics, tracking, cloud sync, AI processing, or developer-server upload.