Convert EPUB to MOBI Online Free
Convert EPUB ebooks to MOBI format. Powered by Calibre for reliable ebook format conversion with preserved chapter structure.
ChangeThisFile converts your EPUB ebook to the Kindle-compatible MOBI format using Calibre on our secure servers. MOBI can be sideloaded onto older Kindle devices via USB transfer. Your file is encrypted during transfer, processed quickly, and auto-deleted afterward, free with no signup needed.
Convert EPUB to MOBI
Drop your EPUB file here to convert it instantly
Drag & drop your .epub file here, or click to browse
Convert to MOBI instantly
EPUB vs MOBI: Format Comparison
Key differences between the two formats
| Feature | EPUB | MOBI |
|---|---|---|
| Format | Electronic Publication | Mobipocket |
| Developer | IDPF/W3C | Mobipocket SA / Amazon |
| Features | Reflowable text, CSS styling, embedded fonts/images | Basic formatting, bookmarks |
| File size | Compressed XHTML (small) | Compressed (moderate) |
| DRM | Optional DRM | Amazon DRM possible |
| Reader support | Most e-readers except Kindle | Kindle devices, Kindle app |
When to Convert
Common scenarios where this conversion is useful
Kindle device compatibility
Convert EPUB to MOBI for sideloading onto older Kindle devices that do not support EPUB.
Email to Kindle
Send MOBI files directly to your Kindle email address for wireless delivery to your device.
Kindle app reading
Read converted ebooks in the Kindle app on iOS, Android, and desktop platforms.
How to Convert EPUB to MOBI
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1
Upload your EPUB file
Drag and drop your .epub file onto the converter, or click to browse. Files up to 50 MB are supported for free.
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2
Server-side conversion
Your file is securely uploaded and converted on our servers using Calibre, the powerful ebook management tool. This typically takes a few seconds.
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3
Download the result
Once conversion is complete, click Download to save your .mobi file. The uploaded file is automatically deleted from our servers.
Frequently Asked Questions
Yes, completely free. Convert EPUB to MOBI with no cost, no signup, and no watermarks.
No. Files are automatically deleted immediately after conversion. Nothing is stored or retained.
Yes. Files are transferred over encrypted HTTPS connections. Your data is protected in transit.
The conversion uses Calibre, the powerful ebook management tool on our servers, ensuring reliable and high-quality output.
Yes. Chapter structure, headings, paragraphs, and basic styling are preserved during the EPUB to MOBI conversion.
Yes. Cover images and inline images are transferred to the output file.
Yes. The table of contents from the EPUB file is rebuilt in the MOBI output for easy navigation.
No. DRM-protected ebooks cannot be converted. Only DRM-free files are supported.
Footnotes and endnotes are preserved when both source and target formats support them.
Embedded fonts are included in the MOBI output when the format supports font embedding.
Currently, files are converted one at a time. Upload your next file after downloading the result.
Files up to 50 MB are supported for free conversion.
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