EPUB Chapter Lab

Correct an EPUB reading order without overwriting your source. EPUB Chapter Lab is an offline editorial workspace for existing DRM-free EPUB3 publications. Import a file, inspect its package and chapter text, save a revision plan and build a separate EPUB with a rebuilt table of contents. • Reorder chapters by dragging or using Earlier/Later controls. • Rename table-of-contents labels while preserving the original chapter bodies and headings. • Mark primary reading-order items. Other items remain in the package and spine as linear=no, reachable from the TOC; Primary controls sequential reading. • Edit the primary publication title, creator and language tag. Other metadata and the publication identifier are retained. • Keep up to20 local publications, duplicate a revision, reopen a saved plan or confirm deletion. • Build a flat EPUB3 contents document and update the legacy NCX when present. Existing TOC hierarchy, landmarks and page lists are replaced. • Reopen and verify the built reading order, metadata, TOC targets and unchanged resource payload bytes before delivery. • Save a real EPUB or a ZIP containing that EPUB, full PDF/CSV/text editorial audit, source-bound plan JSON and SHA-256 manifest. Share the ZIP through Android. • Save the original separately. Restore plan JSON only when its source hash matches the selected original EPUB. The source stays separate Private copies and plans survive restart. Export creates new files; it does not edit the file you selected. Original chapter bodies, CSS, images and other unchanged resource bytes are retained in the rebuilt package. Internal chapter-body links are not rewritten. Extracted text preview never runs HTML, scripts or network resources; it is not a rendered ebook page. Word counts are whitespace-token counts. Detailed reports are English and retain original text; controls support English and Korean. Supported scope and limits Repair supports EPUB3 with local XHTML reading-order items. EPUB2, navigation inside the spine, fixed-layout, encrypted/obfuscated or signed packages, media overlays, invalid/duplicate IDs and unsafe paths cannot be rebuilt. External/internal XML DTDs are rejected; UTF-8 and BOM-marked UTF-16 XML are accepted. This is not a full HTML/CSS editor, DRM-removal tool, visual rendering check or EPUBCheck certification. Up to16MiB per original EPUB,32MiB expanded,4MiB per entry,2000 ZIP entries and300 spine items. The library holds20 publications and250MiB of private originals. Chapter text preview is limited to200,000 characters. No account, ads, analytics, subscription, in-app purchases, network or broad storage permission. Android backup is disabled. You select individual files, save destinations and sharing recipients; document providers and other apps follow their own policies. Keep independent copies of important files. Android and iPhone/iPad editions are separate purchases.

Initial Android edition with durable publication plans, reading-order and flat-TOC rebuilding, and real EPUB/PDF/CSV delivery.