DOCX to MOBI Converter

Convert DOCX to MOBI online, for free.



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By proceeding, you confirm you own the rights to the files you upload and agree to our Terms of Use.


Default
Optimizes layout and formatting for a specific e-reader. Choose the one that matches your device.
No
Attempts to detect and correct common styling problems in the source file. Experimental, so check the output before relying on it.
Add margin (0-10 cm)
No Change
The base font size is the size of the bulk of the text in your document. Set it and we rescale every font size proportionately, so the most common size becomes your chosen value and headings, captions, and other text scale with it. Select "No Change" to keep the original sizes.
For example, "Mikhail Gorbachiov" will be replaced by "Mikhail Gorbachiov."
Auto
Sets the character encoding of the input file. Use this if your text shows up as garbled symbols, which happens when a file has no encoding declaration or declares the wrong one. This overrides any encoding declared in the file, so leave it on "Auto" unless you're fixing a specific problem.
Enter a title (maximum 100 characters) for the output file. This is stored in the file's metadata and is what e-readers display in a library list, rather than the filename. Leave it empty to use the source file's title, if it has one.
Enter Author Name, maximum 100 characters


How to Convert DOCX to MOBI?

  1. Click the “Choose Files” button to select your DOCX files.
  2. Click the “Convert to MOBI” button to start the conversion.
  3. When the status change to “Done” click the “Download MOBI” button

Easy to Use

Simply upload your DOCX files and click the convert button. You can also batch convert DOCX to MOBI format.

Best Quality

We use both open source and custom software to make sure our conversions are of the highest quality. In most cases, you can fine-tune conversion parameters using “Advanced Settings” (optional, look for the icon).

Free & Secure

Our DOCX to MOBI Converter is free and works on any web browser. We guarantee file security and privacy. Files are protected with 256-bit SSL encryption and automatically deleted after 8 hours.


Word Open XML Document (DOCX) is the default format of Microsoft Word since the 2007 release and the most common word-processing format in the world. Despite appearances, a DOCX is not a single document but a ZIP package holding Office Open XML files, images, and styles. That structure makes DOCX smaller than the old DOC format, far more resistant to corruption, and readable by software that has never seen Word.

 

How to open a DOCX file?

Microsoft Word opens DOCX natively on Windows, macOS, the web, and mobile. Word for the web handles most documents in a browser.

 

LibreOffice Writer, Google Docs, and Apple Pages all read and edit DOCX, though very complex layouts can shift slightly. When the formatting must stay exactly as the author intended, convert the file with our DOCX to PDF tool before sharing it.

 

Developed by: Microsoft

Standard: ECMA-376 / ISO/IEC 29500

Initial Release: 2007


Mobipocket eBook (MOBI) is an e-book format built for handheld devices, storing text as compressed HTML so that it reflows to fit small screens. Amazon bought Mobipocket in 2005 and made MOBI the foundation of the original Kindle format. It supports bookmarks, annotations, and a table of contents, but not the complex layouts or embedded fonts that EPUB allows. Amazon retired MOBI support in 2022.

 

How to open a MOBI file?

Calibre is the most capable option: it reads MOBI, manages your library, and converts between every common e-book format.

 

Older Kindle e-readers and the Kindle desktop app still open MOBI files copied over USB, and mobile apps such as FBReader and Moon+ Reader handle them too. Because Amazon’s Send to Kindle service no longer accepts MOBI, converting your library with our MOBI to EPUB tool is worth doing.

 

Developed by: Mobipocket SA, later Amazon.com

Initial Release: 2000

FreeConvert.com can convert your other files to MOBI format:

FreeConvert.com can convert your DOCX files to these other formats:


Your Data, Our Priority

At FreeConvert, we go beyond just converting files—we protect them. Our robust security framework ensures that your data is always safe, whether you're converting an image, video, or document. With advanced encryption, secure data centers, and vigilant monitoring, we've covered every aspect of your data's safety.

Learn more about our commitment to security
  • SSL/TLS Encryption SSL/TLS
    Encryption
  • Secured Data Centers Secured Data
    Centers
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