Check Translated EPUB Chapters Before Export
Before exporting a translated EPUB in LangBox, inspect each chapter to confirm all sections finished processing, the rebuilt table of contents links to the right headings, and no paragraphs shifted. If a chapter appears blank, check the original view to see whether it reflects an unfinished job, an unsupported image-only page, or a source parsing and structure issue.
When This Chapter Inspection Workflow Applies
Use this workflow for DRM-free, text-based EPUB, MOBI, or AZW3 files under 10 MB in the public translator, or for DRM-free EPUB files from 10 MB to 100 MB in the signed-in EPUB reader using chapter-by-chapter translation (large MOBI and AZW3 files are not supported in the signed-in reader). This guide does not apply to DRM-protected purchases, scanned page images inside an e-book wrapper, or graphic novels, because LangBox does not perform EPUB OCR or image translation.
Four Steps to Verify EPUB Chapters in LangBox
- Select your target language and upload your DRM-free e-book to start processing, then check the chapter navigation list. For EPUB files between 10 MB and 100 MB in the signed-in reader, trigger translation on each chapter and confirm every section has finished before attempting a full-book export.
- Click through the table of contents from top to bottom. Verify that each entry jumps to the corresponding translated heading and that no front matter, epilogue, or numbered chapter title was skipped or left in the source language.
- Compare the opening and closing paragraphs of several chapters against the original text. Confirm that source and target blocks align without merging across scene breaks, and check whether decorative running headers were accidentally pulled into the body text.
- Scan across chapter boundaries to verify that character names, place names, and chapter numbers remain consistent, especially if you translated chapters in separate sessions or changed the selected translation model mid-book.
Illustrative Chapter Heading and Dialogue Inspection
The following snippet and inspection result are invented examples for illustration, not measured LangBox output.
- Original
- Chapter 7: The Glass Conservatory 7 | THE GLASS CONSERVATORY "Did you lock the south greenhouse?" Clara asked, setting her lantern on the stone bench. "Before dusk," Julian replied.
- Example interpretation
- Plain text alone cannot prove which line is the structural heading, though 'Chapter 7: The Glass Conservatory' is likely the heading and '7 | THE GLASS CONSERVATORY' a print-style header. Consult the original navigation or HTML structure to confirm the table of contents links to the true heading.
If the stray line '7 | THE GLASS CONSERVATORY' merges into the next paragraph, the translation may attach those title words to Clara's question about locking the south greenhouse, turning a clean dialogue opening into a confusing run-on sentence, or the two dialogue lines could merge into one.
Key Chapter Checks Before Full-Book Export
| What to Check | How to Verify |
|---|---|
| Table of Contents Links | Pass: Clicking 'Chapter 7' in the navigation jumps directly to the translated Chapter 7 heading. Fail: The link jumps to Chapter 6, skips an unnumbered prologue, or displays the title in the source language. |
| Opening and Closing Alignment | Pass: The first and last dialogue lines of the chapter match the original paragraph breaks. Fail: Two separate speaker turns merge into one paragraph or the final sentence of the chapter is cut off. |
| Embedded Running Headers | Pass: Stray print headers like '7 | THE GLASS CONSERVATORY' stay isolated or out of the narrative flow. Fail: A repeated chapter title or page number appears mid-sentence where an old page break used to be. |
| Cross-Chapter Name Consistency | Pass: Recurring names like 'Clara' and 'The Glass Conservatory' keep the same translated spelling from Chapter 1 through Chapter 7. Fail: A character or location name shifts spelling after you switch translation models mid-book. |
When to Stop, Retry, or Change Your Source File
If a translated chapter appears completely blank or contains only a title, stop before exporting and inspect the original file at that exact section. Empty chapters can have several causes: the section may simply be a blank divider or spacer in the source structure, the chapter translation may not have finished processing, the file may have formatting or DRM restrictions, or the section may consist entirely of graphics. If reflowable source text is present in the original view, try selecting the chapter again in the signed-in reader so translation can finish. However, if the original section consists only of full-page text images, decorative title graphics, or scanned pages, retrying will not recover text—LangBox has no automated repair button and cannot perform OCR or image translation inside EPUBs, so you will need a reflowable text edition.
Relevant LangBox EPUB Limits
The public translator supports DRM-free text EPUB, MOBI, and AZW3 files under 10 MB with a one-time 2M-token guest trial (subject to usage limits), while signed-in users receive 10M tokens every 30 days, can choose among available translation models, and can open EPUB files up to 100 MB in the signed-in reader. EPUB files from 10 MB to 100 MB use chapter-by-chapter translation, and every chapter must finish before full-book export is available. Exports rebuild the text and table of contents while omitting original covers, images, and complex formatting. Interactive word lookup, saving, and review remain inside LangBox and are not exported.
Frequently Asked Questions
Why is the full-book export option unavailable for my 25 MB EPUB?
Files between 10 MB and 100 MB are handled in the signed-in EPUB reader using chapter-by-chapter translation. LangBox requires all chapters in the book to finish translating before unlocking the full-book export. Check your chapter list for any untranslated sections, including front matter, notes, or appendices.
Why did my exported EPUB lose its chapter opener illustrations and maps?
When LangBox exports a translated e-book, it rebuilds the text and table of contents into a clean structure and intentionally omits original book covers, embedded images, and complex layout formatting. If a chapter contained only a map or illustration, that section will appear empty in the exported text.
How can I tell if a blank translated chapter is an unfinished job or an unrecoverable image section?
Open the chapter in the original view to see what the source file actually contains. If selectable text appears in the original, trigger the chapter translation again in the signed-in reader and wait for it to finish. If the original section is just an illustration, decorative title graphic, or blank spacer page, retrying will not produce text because LangBox omits images and does not perform EPUB OCR.