How to convert MOBI to Kindle (AZW3)
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Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
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Convert MOBI to Kindle (AZW3)
NexMedia converts MOBI to Kindle (AZW3) on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About MOBI
MOBI is the Mobipocket ebook format, which Amazon acquired in 2005 and used for the first Kindles.
Older Kindle devices and ebook collections from before AZW3.
MOBI supports only basic formatting, and Amazon's Send to Kindle no longer accepts MOBI files.
Convert MOBI to AZW3 online free, no account required — AZW3 is Amazon's Kindle Format 8 ebook format.
Change MOBI to AZW3 without losing quality — convert MOBI to AZW3 free in your browser.
Why won't Amazon accept my MOBI file for the Kindle anymore? Amazon retired the old MOBI format for personal documents, and modern Kindles expect EPUB or AZW3 instead — converting keeps the book readable.
About Kindle (AZW3)
AZW3, also called KF8, is Amazon's Kindle Format 8, introduced in 2011 with HTML5 and CSS3 formatting.
Kindle ebooks with a richer layout than MOBI; Kindle devices and Calibre read it.
Books bought from Amazon usually carry DRM, and DRM-protected files cannot be converted.
Why convert an ebook to AZW3? To load it onto a Kindle in Amazon’s native format, with better typography support than old MOBI.
What changes when you convert MOBI to AZW3
- Ebook conversion is best-effort: the text, images and table of contents of the MOBI carry over to AZW3, but layout and styling can change.
- Fixed layouts, embedded fonts and complex styling in the MOBI may not survive the move to AZW3.
- MOBI files can carry DRM copy protection; protected files are detected and refused, because copy protection is never removed.
Settings you can change
Before you convert MOBI to AZW3, you can adjust: Title, Author, Language, Page size, Base font size, and Generate table of contents.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted AZW3 file is kept for 2 hours, then deleted.
MOBI to AZW3: questions and answers
Does converting MOBI to AZW3 reduce quality?
Ebook conversion is best-effort: the text, images and table of contents of the MOBI carry over to AZW3, but layout and styling can change.
What is the difference between MOBI and AZW3?
MOBI is the Mobipocket ebook format of early Kindles. AZW3 is Amazon's Kindle Format 8 ebook format.
Can I change the settings when converting MOBI to AZW3?
Before you convert MOBI to AZW3, you can adjust: Title, Author, Language, Page size, Base font size, and Generate table of contents.
Do I need an account to convert MOBI to AZW3?
No. You can convert MOBI to AZW3 without an account; signing in raises the file-size and daily limits.
How long is my converted AZW3 file kept?
The AZW3 file you convert from MOBI is kept for 2 hours, then deleted automatically.
Will the page layout of my MOBI survive in the AZW3?
Fixed layouts, embedded fonts and complex styling in the MOBI may not survive the move to AZW3.
What happens if my MOBI file is copy-protected?
MOBI files can carry DRM copy protection; protected files are detected and refused, because copy protection is never removed.