Convert Documents to MOBI Online — Free eBook Converter
Use this free online converter to transform documents and eBooks from a wide range of formats into MOBI — the format used by Amazon Kindle devices and apps. No software installation or account required.
What is the MOBI format?
MOBI (short for Mobipocket) is an eBook file format originally developed by Mobipocket SA and later adopted by Amazon for its Kindle ecosystem. A MOBI file packages text, images, and metadata such as the title, author, and cover art into a single portable file optimised for e-ink readers and reading apps. It supports reflowable text, bookmarks, annotations, and basic DRM (Digital Rights Management). While Amazon has since introduced the newer AZW3/KF8 format, MOBI remains widely supported across Kindle hardware generations and third-party reading applications.
Why convert to MOBI?
Converting your document to MOBI makes it straightforward to read on Amazon Kindle devices or the Kindle app without the formatting issues that can arise when sending raw Word documents or PDFs to a device. Common reasons to convert include:
- Sending personal documents to a Kindle via the Send-to-Kindle service or USB transfer
- Self-publishing or sharing drafts with beta readers who use Kindle devices
- Archiving long-form articles, research papers, or reports in a readable eBook format
- Converting an existing EPUB eBook library to a format compatible with older Kindle models
Supported input formats
The converter accepts a broad range of source formats, including EPUB, PDF, DOCX / DOC, ODT, RTF, TXT, HTML, FB2, LIT, LRF, PDB, and many other document and eBook types. This means you can bring together content from virtually any source and produce a single Kindle-compatible MOBI file.
Frequently asked questions
Is this MOBI converter free to use?
Yes, the converter is completely free. No subscription, payment, or account creation is required to convert your files.
Do I need to install any software?
No installation is needed. The conversion runs entirely in the cloud, so you only need a web browser to upload your file and download the result.
What happens to my uploaded files?
Files are processed on the server solely to perform the conversion and are deleted automatically afterwards. They are not stored, shared, or used for any other purpose.
Can I open the converted MOBI file on my Kindle?
Yes. MOBI is the native format for Amazon Kindle devices and the Kindle app. You can transfer the file via USB or email it to your Kindle’s personal document address.
What is the difference between MOBI and EPUB?
EPUB is an open standard supported by most eReaders and reading apps, while MOBI is Amazon’s proprietary format optimised for the Kindle ecosystem. If your target device is a Kindle, MOBI is the better choice; for other devices, EPUB is generally preferred.