TXT → MOBI/AZW3
Converting a novel from Plain text (.txt) to Kindle / Mobipocket (.mobi, .azw3, .azw) is a routine step in practice — the Kindle format reads natively on Amazon devices and apps, and can be delivered with Send to Kindle. Fortunately Plain text and Kindle / Mobipocket are structurally close, so there is not much to lose. Below we explain in detail how Plain text becomes Kindle / Mobipocket 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 TXT?
TXT is plain text: nothing but characters and line breaks, with no presentation information at all. That makes it the smallest and most compatible option — from the most basic feature phone to any operating system, there is almost no software that cannot open it. Most Chinese web novels circulate as TXT, and it is the easiest format to copy, search, batch-process and convert further. The cost is that it stores no images, colours, tables or table of contents, and there is nowhere to keep the title and author, so it behaves more like a clean body of text than a complete book. Read the TXT format guide
| Extensions | .txt |
|---|---|
| Typical use | Chinese web novels, logs, and any text-only content that needs maximum compatibility. |
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. |
How to convert TXT to MOBI/AZW3
TXT carries no chapter markers — a heading is just a line that looks like one. Before converting, confirm the text has been split correctly (a regex matching chapter patterns), otherwise the whole book becomes one un-navigable block inside EPUB or Kindle.
Producing .mobi/.azw3 requires Amazon's toolchain or Calibre. AZW3 supports reasonable CSS while legacy .mobi supports very little; for newer devices, target AZW3 — or simply deliver an EPUB.
The source contains no images, so the result has no cover or illustrations. EPUB/Kindle library views then show a blank placeholder — add a cover manually afterwards or the title is unrecognisable on a shelf.
The source carries no metadata at all — plain-text formats such as TXT and Markdown are the classic case — while the target expects a title and author. Converters fall back to the filename, so libraries fill up with "Untitled" or titles still carrying the .txt or .md suffix — fill them in during conversion.
Chapter headings in the source are ordinary lines while the target demands a real table of contents. Converters try to match patterns such as "Chapter N"; when the match is poor the TOC is garbled or the book has a single chapter. Check that TOC entries match the actual chapter count.
Convert TXT to MOBI/AZW3
TXT → KINDLE
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.