Terms of use

Effective November 7, 2026. EPUB Chapter Lab is a focused local EPUB editorial tool.

Your publications

Use publications you are entitled to inspect and modify. You select the source, changes and recipients. Keep independent originals and backups. Exports are separate files; inspect them in your intended reader and production workflow before distribution.

Repair scope

Rebuilding replaces EPUB3 navigation with a flat TOC and updates metadata and spine linear flags/order. Nonlinear items remain linked from the TOC. Original chapter bodies, styles and unmodified resource bytes are retained; body links are not rewritten. This is not a full ebook layout editor, DRM-removal service, visual-rendering validator or EPUBCheck certification. Supported files and limits are on the support page.

Purchase and support

The Android edition is planned as one paid-upfront Google Play purchase, without subscriptions or in-app purchases. Google Play controls payment, availability and refunds. iOS and Android are separate purchases. Contact maga40@naver.com for reproducible product issues.