MOBI/AZW3 → HTML
Converting a novel from Kindle / Mobipocket (.mobi, .azw3, .azw) to HyperText (.html, .htm, .xhtml, .xml, .mhtml) is a routine step in practice — HTML opens in any browser and embeds easily into a web page. Fortunately Kindle / Mobipocket and HyperText are structurally close, so there is not much to lose. Below we explain in detail how Kindle / Mobipocket becomes HyperText and what to watch out for, and the page ends with a converter that does the job right in your browser — nothing is uploaded, the file never leaves your machine.
What is MOBI/AZW3?
The Kindle family (.mobi, .azw3, .azw) is Amazon's proprietary e-book format. It reflows and can carry a table of contents, and it is read mainly on Kindle devices and the Kindle app, or delivered through Send to Kindle. AZW3 supports a reasonable amount of CSS while the older .mobi barely supports any. It is one of the most common proprietary formats in existing libraries — plenty of books bought or downloaded years ago are in it — which is why converting it to something more portable is such a practical need. Read the MOBI/AZW3 format guide
| Extensions | .mobi.azw3.azw |
|---|---|
| Typical use | Reading on Kindle devices and the Kindle app; one of the most common proprietary formats in existing libraries. |
What is HTML?
HTML and XHTML are the structural languages of the web, and XHTML is also what EPUB uses internally to hold its content — so converting between HTML and EPUB is essentially a matter of swapping the shell and how assets are packaged. .mhtml goes further and packs a page together with its images and styles into one file, which suits preserving online pages that may disappear. HTML's strength is that it is universal and opens in any browser; its weakness is that styles and images are usually external links, so shipping one self-contained file means inlining them first. Read the HTML format guide
| Extensions | .html.htm.xhtml.xml.mhtml |
|---|---|
| Typical use | Captured web content, EPUB internal content, and a general intermediate representation for other formats. |
How to convert MOBI/AZW3 to HTML
.mobi/.azw3 are proprietary Amazon binary containers with no official parsing spec; third-party tools rely on reverse engineering and occasionally fail or drop metadata. AZW3 stores HTML internally, so extracting text is easier than preserving layout.
Whether images and styles are linked or embedded decides if the result travels as one file. To ship a single file, inline the assets as data URIs or use MHTML; otherwise moving the file breaks the images. Keep semantic tags (h1–h6, p) so a later EPUB conversion still yields a table of contents.
If you still want chapter navigation inside the HTML file, a novel reader such as Tide Reader can split it automatically by recognising explicit chapter-heading lines in the text.
Convert MOBI/AZW3 to HTML
KINDLE → HTML
The Kindle formats (.mobi, .azw3, .azw) are Amazon's proprietary binary containers with no public specification, so they cannot be reliably parsed or produced in a browser. This direction needs a desktop e-book tool; the EPUB or TXT you convert can be read in the Kindle app directly.
A novel reader that syncs your progress across every platform
Tide Reader opens TXT and EPUB, detects chapters on import, lays the text out the way you like it, and syncs your reading position across Windows, macOS, iOS and Android. Drop the converted file in and start reading.
Download Tide ReaderTXT and EPUB; local-first reading, with optional cloud sync and WebDAV.