What happens when you convert DOCX to MOBI
- The Word document is read by pandoc, the open-source document converter, on our conversion server: headings, paragraphs, lists, tables, links, footnotes and images, and written as an EPUB, which Calibre then turns into a MOBI e-book.
- Images inside the DOCX are kept.
- The book title is taken from the DOCX's own title if it has one, otherwise it is called Document. MOBI is an older Kindle format: Send to Kindle no longer accepts it, but older Kindles and the Kindle apps still read it.
- This conversion runs on our server: the file is uploaded, converted, and deleted together with the result as soon as the result has been sent back to you. Nothing is kept. Files up to 25 MB are accepted.
How to convert DOCX to MOBI online
- Press "Choose DOCX files" and select one or more files, or drag them onto the box. Files up to 25 MB each can be converted.
- There are no settings to choose: the converter keeps everything the target format can hold.
- Press "Convert to MOBI". The file is uploaded to our conversion server, converted in a few seconds, and deleted together with the result as soon as the result is sent back.
- Save each MOBI with its download button. Our server has already deleted both your DOCX and the MOBI by then.
Why convert DOCX to MOBI?
DOCX files usually come from letters, reports, CVs and most documents shared at work. People convert them to MOBI because MOBI is what older Kindles and the Kindle apps read.
In short, DOCX is good at what it was made for, and MOBI is the more practical choice when the file has to open, upload or print somewhere else. DOCX opens in Word, Google Docs, Pages and LibreOffice Writer, while MOBI opens on older Kindles and in the Kindle and Calibre apps.
How to convert DOCX to MOBI on Windows, Mac, iPhone and Android
On Windows
Open this page in Chrome, Edge or Firefox, drag your DOCX files in from File Explorer, and press Convert. Each MOBI is saved to your Downloads folder.
On a Mac
Safari, Chrome and Firefox all work. Drag the DOCX files from Finder onto the drop zone and the MOBI files land in Downloads.
On iPhone and iPad
Open the page in Safari and tap Choose DOCX files. You can pick from Photos or from the Files app. The converted MOBI appears in Files, in the Downloads folder.
On Android
Open the page in Chrome, tap Choose DOCX files and pick them from Files or your gallery. The MOBI is saved to the Download folder, where any file manager can find it.
Best settings for DOCX to MOBI
There are no settings: pandoc's defaults give a clean, standard result that is easy to restyle.
If something is missing, check whether it depended on a file outside the DOCX; the converter reads the file alone.
DOCX vs MOBI: the differences
| DOCX | MOBI | |
|---|---|---|
| Full name | Word document | Mobipocket e-book |
| Type | document | e-book |
| Created by | Microsoft | Mobipocket, later Amazon |
| First released | 2007 | 2000 |
| Compression | Lossless | Lossless |
| What it holds | formatted text, images, tables and styles in a ZIP of XML files | a book's text, images and table of contents |
| In a browser | opens in Word, Google Docs, Pages and LibreOffice Writer | opens on older Kindles and in the Kindle and Calibre apps |
| Common uses | letters, reports, CVs and most documents shared at work | older Kindle e-readers and e-books from the 2000s |
| MIME type | application/vnd.openxmlformats-officedocument.wordprocessingml.document | application/x-mobipocket-ebook |
About DOCX and MOBI files
What is a DOCX file?
DOCX has been Word's default format since 2007. Like XLSX it is a ZIP archive of XML files, which is how its text can be read without Word.
What is a MOBI file?
MOBI was the Kindle's original format. Amazon has since moved to AZW3 and KFX and no longer accepts MOBI through Send to Kindle, which now takes EPUB instead.
DOCX to MOBI not working? Common problems
- "Files up to 25 MB can be converted." Server conversions have a size limit. Compress the images inside the file, or split it, and try again.
- "The conversion took too long and was stopped." Very long or complex files can pass the 90 second limit. Split the file and convert the parts.
- The file will not convert. It may be password protected, damaged, or saved in a newer or unusual version of the format.
Convert DOCX to MOBI from the command line
pandoc does the same on your own computer, with Calibre for the last step:
pandoc input.docx -o output.epub
ebook-convert output.epub output.mobiConverting on your own computer keeps the file entirely local, which is worth it for very large or very sensitive documents. For everything else, the converter on this page does it without installing anything.
DOCX to MOBI converter FAQ
Will I lose quality converting DOCX to MOBI?
The text and its structure are kept exactly. Layout and styling from the DOCX are not, because pandoc converts the document's structure rather than its look.
Why is the MOBI a different size from the DOCX?
Larger than the DOCX, because MOBI wraps the text in styles and settings inside a compressed package, even when the text is short.
Are my DOCX files uploaded?
Yes, for this conversion. A faithful DOCX to MOBI conversion needs pandoc and Calibre, two open-source tools, which cannot run in a browser. The file travels over an encrypted connection, is converted in a private temporary folder, and is deleted together with the MOBI as soon as the result has been sent back to you. We do not keep, read or share it.
Can I convert several DOCX files to MOBI at once?
Yes. Select or drop as many files as you like; they are converted one after another and each gets its own download button.
How do I open a MOBI file?
MOBI opens on older Kindles and in the Kindle and Calibre apps. MOBI is common for older Kindle e-readers and e-books from the 2000s.
Is this DOCX to MOBI converter free?
Yes. There is no sign-up and no watermark. Because this conversion uses our server, there is a fair-use limit of 25 MB per file and a number of files per hour, which stops the service being overloaded.
Can I convert DOCX to MOBI on my phone?
Yes. It works in Safari on iPhone and iPad and in Chrome on Android. The conversion happens on our server, so it is as fast on a phone as on a computer; the MOBI is saved to your Downloads folder.