| My EPUB will not open | The file may be corrupt, incomplete, password protected or not actually EPUB despite its extension. | Try opening the original in a reputable reader, re-export a valid DRM-free copy and review tool errors before converting. |
| MOBI conversion fails | The source may contain unsupported structures, unusual encoding, oversized assets or DRM. | Check DRM status, simplify or validate the source if you control it, and retry with a small known-good test book. |
| AZW3 output is actually MOBI | The browser workflow describes a MOBI fallback rather than true AZW3/KF8 generation. | Use the actual MOBI as intended or consult the separate API availability for true AZW3; do not just rename the file. |
| Kindle will not open the converted file | The format, transfer method, codec-like internal features or reader generation may be incompatible. | Check the exact Kindle model and official transfer guidance, and try an appropriate supported EPUB delivery or legacy MOBI route. |
| Book cover is missing | Cover metadata may point to an absent asset, or the reading app may cache old metadata. | Replace or regenerate the permitted cover, re-convert and re-import the book into the target application. |
| Table of contents links do not work | The source navigation or anchors may be malformed or lost during format reconstruction. | Review chapter IDs and navigation in the source if editable, convert again and test several links in a reader. |
| Words contain strange characters | Incorrect source encoding or font substitutions can distort text. | Confirm UTF-8 or the source encoding where available, inspect Unicode characters and use a suitable reader font. |
| PDF to EPUB paragraphs are jumbled | The original uses columns, floats, headers, footnotes or fixed-page positioning. | Proofread reading order; use a cleaner editable source if possible, and preserve PDF when exact layout is essential. |
| Scanned PDF converts to empty pages | The PDF may contain only page images and OCR did not run or recognize text. | Enable the available OCR flow, improve scans and inspect recognized text before converting again. |
| OCR produces wrong names and numbers | Low contrast, unusual fonts, skew or language settings cause recognition errors. | Rescan or preprocess pages and proofread high-value names, dates, measurements and citations. |
| Images are blurry after conversion | Image optimization may downsample source illustrations. | Reduce optimization, use higher-quality assets and review the output on the target screen. |
| Converted eBook is unusually large | Embedded high-resolution pictures, covers or output packaging can increase file size. | Review image settings and use conservative compression while retaining legibility. |
| Chapters appear in the wrong order | The source manifest or reading order may be invalid or parsed ambiguously. | Repair chapter sequence in an editable source or EPUB package, then test navigation and reading flow. |
| Fonts or margins look different | Reader applications override CSS or the output format has less styling support. | Use simpler typography and test the book on the device; avoid fixed-width assumptions. |
| Device preset does not match the reader | Presets are general optimization starting points, not device certification. | Try a different supported output and inspect the result on the exact device and firmware version. |
| A DRM warning appears | The file contains access restrictions detected by the converter. | Use the publisher or library authorized reading route; the tool does not remove DRM. |
| Batch conversion stops halfway | Large images, too many files or browser memory limits may interrupt jobs. | Reduce batch size, close memory-intensive tabs and retry failed DRM-free books separately. |
| ZIP download is missing titles | Some batch jobs may have failed or browser downloads may have been interrupted. | Check per-file status, retry failed items and inspect the ZIP manifest after downloading. |
| Conversion preview differs from the reader | Preview engines and e-readers implement fonts, layout and navigation differently. | Use the preview for early review but perform final checks in the intended reader app. |
| Import from URL fails | The remote source may deny cross-origin access, require authentication or be unavailable. | Use a permitted local copy when possible, confirm the URL and avoid protected or untrusted sources. |
| The file appears to upload despite privacy messaging | An optional URL import, API request or Chromium-assisted PDF mode may involve remote processing. | Check the active workflow and privacy policy, and avoid sensitive content until data handling is understood. |
| Converted book loses notes and highlights | Annotations often live in reader databases instead of the eBook itself. | Export notes through the original reading app where permitted and do not expect annotations inside a converted book. |
| Reader says publication is invalid | The generated file may have malformed manifest, navigation or resource references. | Run a suitable format validator, inspect the report and retry with a repaired source. |
| Text wraps badly around images | Fixed-width styling or floating assets may translate poorly to a reflowable destination. | Simplify layout in an editable source, adjust image dimensions and retest on a narrow screen. |