Convert MOBI to AZW3
Free, fast and secure — convert MOBI to AZW3 right in your browser.
MOBI
AZW3
Convert MOBI to AZW3 for wider compatibility
Converting MOBI to AZW3 gives you a more widely supported file that opens cleanly across more devices, apps and platforms — handy when MOBI will not play nicely everywhere.
How to convert MOBI to AZW3
- 1 Drop your MOBI file into the converter above.
- 2 It is converted to AZW3 automatically — no settings to fiddle with.
- 3 Download your new AZW3 file instantly.
MOBI vs AZW3
| Feature | MOBI | AZW3 |
|---|---|---|
| Compression | Lossless | Lossless |
| MIME type | application/x-mobipocket-ebook | application/vnd.amazon.ebook |
| Best for | Reading on older Kindle e-readers — often converted from or to EPUB. | Modern Kindle reading — converted to EPUB for other e-readers. |
About the formats
MOBI
Kindle MOBI e-book
MOBI is the older e-book format used by Amazon Kindle devices and apps. It holds reflowable text and is widely supported by older Kindles, though Amazon now favours newer formats.
Strengths
- Works on older Kindle devices
- Reflowable text
- Long-established e-book format
Limitations
- Being phased out by Amazon
- Weaker layout than EPUB
- Not ideal for complex formatting
Best for: Reading on older Kindle e-readers — often converted from or to EPUB.
AZW3
Kindle AZW3 e-book
AZW3 (KF8) is Amazon’s modern Kindle format. It supports richer styling and layout than MOBI and is the format newer Kindle content uses.
Strengths
- Richer styling than MOBI
- Modern Kindle format
- Good text reflow
Limitations
- Locked to the Kindle ecosystem
- Not opened by most non-Kindle readers
- Often needs converting to EPUB
Best for: Modern Kindle reading — converted to EPUB for other e-readers.
Frequently asked questions
Upload your MOBI file above and it is converted to AZW3 automatically. When it is ready, download your new Kindle AZW3 e-book — the whole thing takes just a few seconds in your browser.
Converting MOBI to AZW3 gives you a more widely supported file that opens cleanly across more devices, apps and platforms — handy when MOBI will not play nicely everywhere.
AZW3 is a lossless format, so your converted file keeps its full quality with no degradation.
Yes. The converter is free to use, with no watermark and no sign-up required.
Your files are processed securely and are never shared with anyone.