Translate Illustrated EPUBs: Image Limits
Translate an illustrated EPUB with LangBox when its body text and captions are selectable text, then read the translation or export a rebuilt text edition. Before upload, highlight a sentence and a figure caption in a local viewer to confirm they are live text, not part of an image. Exports omit covers and inline images, so keep the original open for diagrams.
When Illustrated EPUBs Work and When They Fail
This workflow suits light novels, biographies with photo inserts, and textbooks where paragraphs are standard reflowable text and pictures are supplementary. It is unsuitable for comics, manga, children's picture books with text baked into artwork, or fixed-layout technical manuals where meaning depends on spatial alignment between labels and diagrams. LangBox does not perform OCR on EPUB images or translate text embedded inside graphics.
How to Translate an Illustrated EPUB in LangBox
- Open your DRM-free EPUB in a local viewer first and try highlighting a sentence and a figure caption to confirm they are live text rather than part of an image.
- Choose your target language in the interface (signed-in users can also select a translation model). You do not need to select a source language for EPUB files.
- Upload the file to trigger processing: use the public translator for DRM-free EPUB, MOBI, or AZW3 files under 10 MB, or use the signed-in EPUB reader for EPUB files up to 100 MB.
- For 10 to 100 MB EPUBs in the signed-in reader, translate chapters individually and ensure every chapter finishes processing before exporting the rebuilt text and table of contents.
Inspecting Text References to Omitted Diagrams
Invented example for illustration, not measured LangBox output.
- Original
- See Figure 4: only the upper bypass valve remains open during purging. [Image: fig4_manifold.png] Figure 4 caption (HTML text): Upper bypass valve and lower drain port.
- Example interpretation
- The bracketed marker represents an embedded image asset rather than parsed HTML, while the sentence and caption are live text. Because rebuilt exports drop inline images and may not extract every caption structure, check whether the caption appears in the exported EPUB and consult the original book for the diagram.
If the translation broadens 'only the upper bypass valve remains open' to include both valves, or drops the caption's contrast with the lower drain port, a reader cross-referencing Figure 4 in the original file could open the wrong port during purging.
Pre-Translation Checks for Illustrated Ebooks
| What to Check | How to Verify |
|---|---|
| Body Text Selectability | Drag your cursor across a paragraph in a local reader. Pass: individual words highlight separately. Fail: the whole page selects as a single image block, meaning the book is a scan that EPUB translation cannot read. |
| Caption Text vs. Flattened Labels | Try selecting the words beneath a figure and inside the diagram. Pass: captions highlight as normal HTML text. Fail: labels like port names are painted inside the PNG or JPEG and will not appear in the translation. |
| Format and Size Routing | Check the file properties before uploading. Pass: DRM-free EPUB, MOBI, or AZW3 under 10 MB for the public tool, or DRM-free EPUB between 10 MB and 100 MB for the signed-in reader. Fail: MOBI or AZW3 over 10 MB. |
| Standalone Text Meaning | Read a sample paragraph while covering the illustration. Pass: the prose still makes sense or points to a clear figure number you can check in the original file. Fail: comprehension depends on fixed side-by-side layout or ruby glosses. |
When to Stop or Change Your Source File
Stop immediately if translated chapters appear completely blank or contain only a single copyright line. While empty chapters can stem from several causes, including malformed internal structure, DRM restrictions, or chapters consisting entirely of full-page image scans, retrying the same file in the EPUB tool will not fix embedded graphics. Do not expect an automatic repair feature; instead, switch to a reflowable text edition of the book.
LangBox Product Limits for Illustrated Ebooks
LangBox supports only DRM-free files and provides no DRM bypass, EPUB OCR, or image translation. The public translator accepts EPUB, MOBI, and AZW3 under 10 MB, whereas the signed-in large-file reader accepts only EPUB up to 100 MB. Exports rebuild text and the table of contents while omitting original covers, inline images, and complex formatting. Interactive word lookup, saving, and review remain inside LangBox and are not exported. Usage for both guests and accounts is measured in tokens: guests receive a one-time 2M-token public EPUB trial without needing a free account, and signed-in users receive 10M tokens every 30 days.
Frequently Asked Questions
Why did all the pictures and the book cover disappear in my downloaded EPUB?
LangBox rebuilds the exported EPUB using only the translated text and table of contents. It intentionally omits the original book cover, inline illustrations, and complex CSS layouts. Keep your original EPUB file if you need to view the artwork alongside the translated text.
Can I upload a 45 MB illustrated MOBI or AZW3 file to the signed-in reader?
No. The public translator accepts DRM-free EPUB, MOBI, and AZW3 files under 10 MB, but the signed-in large-file reader for books between 10 MB and 100 MB accepts EPUB format only. You would need a valid DRM-free EPUB version to proceed.
How should I read a translated textbook or light novel when chapters refer to numbered figures or maps?
Keep the original untranslated EPUB open in a separate reader window while reading the translated text. Because exported files keep the rebuilt text and table of contents—including figure numbers written as live text—you can use those chapter and figure references to locate the matching map, photograph, or diagram in the original book.