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DOCX is the modern Word document format introduced with Microsoft Office 2007. It uses ZIP compression and XML structure to reduce file size and improve compatibility. DOCX files support text formatting, images, tables, styles, and many other document features.
MOBI is an eBook format originally developed by Mobipocket and later acquired by Amazon. It supports bookmarks, notes, and reflowable text. While largely replaced by AZW and EPUB, MOBI files are still readable on many Kindle devices and apps.
Convert your .docx files to .mobi right in your browser — no downloads, no installs. Everything happens securely in the cloud.
We never store your files permanently. Only you can access them, and they’re automatically deleted from our servers within 2 hours.
Turn your DOCX files into MOBI in just a couple of clicks. No registration, no limits — and it’s 100% free.