Convert EPUB to MOBI

EPUB to MOBI converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.

Conversions

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All file types supported

About formats

EPUB

EPUB (Electronic Publication) is a free, open e-book standard maintained by the W3C (formerly IDPF). EPUB files are ZIP-based archives containing XHTML content, CSS styling, images, and navigation elements, providing reflowable content that adapts to different screen sizes. EPUB is the most widely supported e-book format and is read by Apple Books, Google Play Books, Kobo, Calibre, and most e-readers except older Kindle devices.

Developer: W3C (formerly IDPF)
Initial release: 2007
Compression: Lossless
Color depth: up to 32-bit
Transparency: Yes
Animation: Yes

Best for

Distributing e-books broadly
Reflowable reading on e-readers
Apple Books and Kobo publishing
Open-standard e-book delivery
Adaptive-screen digital books

Pros

+Open W3C standard
+Reflowable content adapts to screen size
+ZIP-based with XHTML and CSS
+Supported by most e-readers except older Kindle

Cons

−Older Kindle devices don't support EPUB
−DRM can restrict access
−Rendering varies across readers
−Complex layouts can be hard to reflow

MOBI

MOBI is an e-book format originally developed by Mobipocket and later acquired by Amazon. MOBI files are based on the Open eBook standard and support DRM protection, bookmarks, annotations, and reflowable text. MOBI was the primary format for Kindle devices until being superseded by AZW3/KFX. MOBI files can still be read by Kindle apps, Calibre, and many third-party e-readers.

Developer: Mobipocket / Amazon
Initial release: 2000
Compression: Lossy
Color depth: up to 8-bit
Transparency: No
Animation: No

Best for

Reading on older Kindle devices
Legacy e-book distribution
DRM-protected Kindle content
Calibre library management
Backward-compatible e-book delivery

Pros

+Supported by Kindle apps and devices
+Supports DRM, bookmarks, and annotations
+Reflowable text
+Readable by Calibre and many e-readers

Cons

−Superseded by AZW3 and KFX
−Limited formatting vs EPUB
−Only 8-bit color
−No longer Amazon's primary format

How to convert EPUB to MOBI

1
Select EPUB files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.
2
Choose mobi — or any other format you need as a result (more than 200 formats supported).
3
Let the file convert, then download your mobi file right away.

EPUB vs MOBI

Property	EPUB	MOBI
Compression	Lossless	Lossy
Animation	Yes	No
DRM support	Yes	Yes
Open format	Yes	No

When to use EPUB vs MOBI

EPUB

Distributing e-books broadly
Reflowable reading on e-readers
Apple Books and Kobo publishing
Open-standard e-book delivery
Adaptive-screen digital books

MOBI

Reading on older Kindle devices
Legacy e-book distribution
DRM-protected Kindle content
Calibre library management
Backward-compatible e-book delivery

Use cases for EPUB → MOBI

Distributing e-books broadly
Reflowable reading on e-readers
Apple Books and Kobo publishing
Open-standard e-book delivery
Adaptive-screen digital books
Reading on older Kindle devices
Legacy e-book distribution
DRM-protected Kindle content
Calibre library management
Backward-compatible e-book delivery

Frequently Asked Questions

Is converting EPUB to MOBI free?

Yes. This EPUB → MOBI converter runs entirely in your browser and is completely free — no account, no credits, no watermark.

Which devices and platforms can I use to convert EPUB to MOBI?

Any modern device with a current web browser: Windows, macOS, Linux, Android, iPhone and iPad. There is nothing to install — the conversion happens locally.

Are my EPUB files uploaded to a server?

No. Files never leave your device. The entire EPUB → MOBI conversion runs locally in your browser, so your data stays private.

Can I convert multiple EPUB files at once?

Yes — batch conversion is supported. Add as many EPUB files as you like and convert them to MOBI in one pass, then download the results together.

What is the maximum file size?

There is no fixed server-side limit because the conversion happens in your browser. Practical limits depend on the available memory and CPU of your device.

Will I lose quality converting EPUB to MOBI?

Yes — MOBI uses lossy compression, so the converted file will discard some information from your lossless EPUB. Choose a high quality setting to minimise the visible loss.

Will transparent areas of my EPUB file be kept in MOBI?

No — MOBI does not support transparency. Transparent areas of your EPUB file will be flattened onto a solid background colour during conversion.

Will the converted MOBI file be smaller than the EPUB?

Usually yes. Converting from a lossless or uncompressed format to a lossy one dramatically reduces file size. Typical savings range from 50% to 90%, depending on the quality setting you choose.

Related Conversions

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FREE

100% Free

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SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

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