Free Online MOBI to AZW3 Converter
Convert MOBI to AZW3 online for free.
Selected files
| File name | Size | Convert to |
|---|
Pick a format to convert to.
Preparing files
Checking files and selected output formats.
MOBI vs AZW3: Side-by-side
Technical comparison of the two formats, useful for deciding which to use, or for confirming what changes during conversion.
| Property | MOBI | AZW3 |
|---|---|---|
| Full name | Mobipocket eBook | Kindle Format 8 |
| Year introduced | 2000 | 2011 |
| Developer / standard body | Mobipocket / Amazon | Amazon |
| MIME type | application/x-mobipocket-ebook | application/vnd.amazon.ebook |
| File extension | .mobi | .azw3 |
| Compression | PalmDOC compression | Variable |
| Color / data depth | N/A | N/A |
| Max dimensions / size | Software-limited | Software-limited |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | Mobipocket | Amazon |
| Best for | Older Kindle devices (replaced by AZW3 then KFX) | Modern Kindle devices, enhanced typography and layout |
Frequently asked questions
Can I convert MOBI books to AZW3 for my Kindle or Kobo?
Yes. Upload your MOBI ebook and it converts to AZW3 with chapter structure, cover art, and formatting preserved. Load the AZW3 onto your Kindle, Kobo, Nook, or any eReader that supports the format.
How to convert MOBI to AZW3 without losing the table of contents
Chapter navigation, the cover image, and text formatting all carry over during conversion. The AZW3 has proper chapter links so you can jump between sections on your eReader just like the original MOBI.
Can I convert multiple MOBI ebooks to AZW3 at once?
Yes. Upload a batch of MOBI files and they are all converted to AZW3. Each book downloads separately or as a ZIP, so you can convert an entire library in one session.
Does the text still reflow after converting to AZW3?
Yes. AZW3 keeps text reflowable, so it adapts to any screen size and font setting on your eReader rather than being locked to a fixed page like a PDF.
Which reader is AZW3 for?
AZW3 is the AZW3 format best for its intended use. Convert your MOBI to AZW3 when your eReader or app opens AZW3 more reliably, so the whole library works on one device.
What is MOBI?
MOBI is an Amazon ebook format, typically used for older Kindle devices. Converting it to AZW3 produces a file that opens on systems without MOBI support.