Step 1: Submit your EPUB files using the button above or by pull and release.
Step 2: Click the 'Transform' button to start the transformation.
Step 3: Save your converted AZW3 files.
EPUB to AZW3 Transformation FAQ
How do I convert EPUB to AZW3 for my e-reader?
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Upload the EPUB file and the converter produces a reflowable AZW3 ebook: text re-flows to fit any screen size, font size is reader-adjustable, and chapters become navigable entries. Sideload the resulting AZW3 to a Kindle, Kobo, or any e-reader app and it behaves like a native ebook, not a fixed-layout page scan.
Will EPUB to AZW3 create a clickable table of contents?
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Yes — heading structure in the EPUB (or existing bookmarks / nav) is turned into a proper AZW3 navigation document, so the e-reader's chapter menu and progress jumps work. If the EPUB has no headings, the converter falls back to page or section breaks to build a usable TOC.
Is the AZW3 reflowable or fixed-layout?
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AZW3 is generated as a reflowable ebook by default — text adapts to the screen and to the reader's chosen font size. This is the right choice for prose. Fixed-layout (preserving exact page geometry, e.g. for comics or heavily-designed pages) is a separate option and trades away font resizing.
Will book metadata (title, author) transfer from EPUB to AZW3?
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Title, author, language, and publisher metadata are read from the EPUB where present and written into the AZW3 OPF package, so the ebook shows the right title and author in your library instead of a filename. You can edit these fields after conversion in Calibre if the source metadata was missing or wrong.
Will the cover image survive EPUB to AZW3 conversion?
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If the EPUB has an identifiable cover (first-page image, embedded cover metadata) it is set as the AZW3 cover so it appears as the library thumbnail. For sources without one, you can add a cover image after conversion — most readers and Calibre let you assign it in a click.
Does AZW3 keep my chapters and section breaks?
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Yes — each chapter becomes its own navigable section in the AZW3, so "next chapter" and the progress bar work correctly. The converter detects chapter boundaries from heading styles, page breaks, or existing structure in the EPUB.
Will the AZW3 work on Kindle / Kobo / Apple Books?
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EPUB is read natively by Kobo, Apple Books, Google Play Books, and most Android readers. For Kindle, target MOBI or AZW3, or send the EPUB to your Kindle address (modern Kindles convert it on receipt). The converter picks sensible defaults per AZW3 format for the target device.
How does the AZW3 handle images and illustrations from the EPUB?
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Embedded images are extracted and re-packaged inside the AZW3 at a screen-appropriate resolution, anchored at their original position in the reading flow. In a reflowable AZW3 they scale to the device; oversized images are downscaled so the ebook file stays small enough to sideload quickly.
Is my EPUB file private during ebook conversion?
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Yes — same privacy model as every conversion: isolated workers, automatic deletion within minutes, no human review of the manuscript. See /privacy/.
Why does my AZW3 have odd line breaks or run-together paragraphs?
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This usually traces to the EPUB: a PDF source with hard line-breaks at every visual line, or a document with manual breaks instead of real paragraphs, confuses paragraph detection. Converting from a structured source (DOCX, EPUB) gives the cleanest AZW3; for PDF sources, the converter applies de-hyphenation and line-join heuristics to recover flowing paragraphs.
Can I convert EPUB to AZW3 and edit it before publishing?
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Yes — the AZW3 is a standard ebook package you can open in Calibre or Sigil to fine-tune metadata, cover, CSS, and chapter splits before distributing. The converter gets you a clean, valid AZW3 starting point; the editor handles final polish.
Will footnotes and endnotes carry from EPUB to AZW3?
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Footnotes and endnotes are converted to AZW3 popup or linked notes where the source marks them as real notes (DOCX, ODT). E-readers then show them as tap-to-view popups. If the EPUB only has notes as plain superscript text, they are preserved inline as text but won't be interactive.