DOC to MOBI Converter

Convert DOC to MOBI Online

Turn a legacy Microsoft Word document into a reflowable MOBI ebook that resizes to fit any Kindle screen, with chapter navigation instead of fixed Letter-size pages. DOC is the old binary Word format Microsoft used by default before Word 2007 switched to DOCX, and it converts cleanly to MOBI because both formats centre on running prose. One thing to know first: MOBI is Amazon's legacy ebook format and Send to Kindle stopped accepting it on December 20, 2023 — so MOBI now suits USB sideloading, older Kindles, and library tools like Calibre. If you want to push a new book wirelessly to a current Kindle, convert DOC to EPUB instead.

How to Convert DOC to MOBI

1. Upload Your DOC File: Drag and drop your .doc into the box or click "+ Add Files" to pick it from your computer. Batch is supported — drop several documents in and each converts in turn.
2. Confirm MOBI as the Output: MOBI is already selected as the target. The converter maps your Word headings, paragraph styles, bold/italic, lists, and embedded images into the ebook's reflowable structure automatically.
3. Keep the Defaults (Optional): The Advanced Options panel notes that the defaults are tuned for the best results — leave them unless you have a specific need. For cleaner chapter navigation, base your structure on Word's built-in Heading 1/Heading 2 styles before uploading.
4. Convert and Download: Click "Convert" and download your .mobi. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared or made public.

MOBI vs EPUB for Kindle

Frequently Asked Questions

What carries over from my DOC file, and what gets dropped?

Headings, paragraph styles, bold and italic, lists, and embedded images carry across, and Word headings become the ebook's chapter navigation. Because MOBI is reflowable, fixed page layout, multi-column sections, headers and footers, and precise positioning are simplified to a single column of running text that wraps to each screen. Anything that depended on the old binary DOC features — VBA macros, field codes, and embedded OLE objects — is dropped, and any non-standard embedded fonts may not carry. In our testing, a 60-page DOC manuscript built from Heading 1/Heading 2 styles produced a MOBI with a clean, tappable chapter list.

Can I still send the MOBI to my Kindle?

Not wirelessly through Amazon's Send to Kindle service — Amazon began winding that down on November 1, 2023 and fully stopped accepting MOBI (plus the related AZW and PRC formats) on December 20, 2023. You can still copy a MOBI onto a Kindle over USB by dropping it into the device's documents folder, and MOBI files already in your library keep working. For wireless delivery of a new title, convert DOC to EPUB instead, since Send to Kindle accepts EPUB.

Why convert DOC to MOBI instead of just sending the Word file to Kindle?

Send to Kindle does accept DOC and DOCX directly and converts them on Amazon's side, but that route only works through Amazon's cloud and produces a file you cannot reuse elsewhere. Converting to MOBI yourself gives you a portable ebook you can sideload over USB, drop into a Calibre library, or read in the Kindle apps and other readers — handy for older Kindles and for keeping an existing MOBI collection in one format.

Should I use MOBI or EPUB for a new ebook?

For anything new aimed at a current Kindle, EPUB is the better target: Amazon recommends it, Send to Kindle accepts it, and it is an actively maintained open standard. MOBI makes sense when you specifically need the older format — for an older e-reader, an existing MOBI collection, or a tool that expects it. You can convert DOC to EPUB in one step here, or migrate later with MOBI to EPUB.

Is there a file size limit for the Word document?

There is no fixed page or word-count cap; the practical limit is how large the upload is and how fast your connection can send it. Most manuscripts are a few megabytes even with images, so they convert quickly. If you also need to email the finished ebook, note that Gmail caps attachments at 25 MB — large illustrated files can exceed that and are better shared by link or copied over USB.