Convert EPUB to MOBI Online Free

Instantly convert EPUB books to Kindle-readable formats. No upload, no signup, 100% private — runs entirely in your browser.

Drop EPUB files here or browse

Accepts .epub files · Up to 100 MB each · Batch supported

Your files never leave your device — 100% private

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How It Works

Step 1

Upload Your EPUB Files

Drag and drop your .epub files into the converter, or click to browse. Batch upload supported.

Step 2

Instant Browser Conversion

Your EPUB is parsed and converted to HTML right in your browser. Nothing is uploaded to any server.

Step 3

Download Your HTML File

Download each converted file individually or grab them all as a .zip. Your original EPUBs are never modified.

Why Use ConvertToMobi?

100% Free, No Limits

No premium tier, no watermarks, no daily caps. Convert as many ebooks as you need.

Complete Privacy

Files never leave your device. No server uploads, no cloud processing, no data collection.

Lightning Fast

JavaScript-powered conversion takes seconds, not minutes. No waiting for server processing.

Works Everywhere

Desktop, tablet, or phone — any modern browser. No app or software installation needed.

Batch Conversion

Drop multiple EPUB files at once. Download individually or as a single ZIP archive.

Metadata Preserved

Book title, author, cover image, and chapter structure are all preserved in the output.

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Frequently Asked Questions

Is ConvertToMobi really free?
Yes, completely free with no limits. There are no premium tiers, no watermarks, and no signup required. Convert as many EPUB files as you want.
Are my ebook files safe and private?
Absolutely. Your files are converted entirely in your browser using JavaScript. No files are ever uploaded to our servers. We literally cannot see your books.
What output formats are available?
We offer two output formats: Single HTML — a universal document readable on any device including Kindle via browser, and Clean EPUB — a re-packaged, optimized EPUB file. Both preserve your book's content, metadata, and cover image.
Can I read the HTML output on my Kindle?
Yes! Kindle devices and the Kindle app can open HTML files. Transfer the converted HTML to your Kindle via USB or email, and it will render as a readable document. For detailed instructions, check our guide on reading EPUB on Kindle.
What is the maximum file size?
Each file can be up to 100 MB. Since processing happens in your browser, very large files depend on your device's available memory. Most ebooks (1-10 MB) convert instantly.
Does it work on mobile?
Yes! The converter works on any device with a modern browser — iPhone, Android, iPad, desktop, laptop. Just tap the upload area to select files from your device.
Can I convert multiple files at once?
Yes! You can drag and drop or select multiple EPUB files. They'll all be converted in sequence, and you can download each individually or grab them all as a single .zip file.
What is the difference between EPUB and MOBI?
EPUB is the universal ebook standard supported by most readers except Kindle. MOBI was Amazon's proprietary format (now replaced by AZW3/KFX). Our converter produces Kindle-compatible output so you can read your EPUB books anywhere. Learn more about EPUB vs MOBI.

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EPUB to HTML

Extract EPUB content as a clean HTML document

About EPUB to MOBI Conversion

EPUB (Electronic Publication) is the most widely used open ebook format, supported by virtually every ebook reader except Amazon Kindle. MOBI was Amazon's proprietary ebook format, used by older Kindle devices. While Amazon has since moved to AZW3 and KFX formats, many users still search for EPUB to MOBI conversion when they want to read non-Amazon ebooks on their Kindle.

Our converter takes a practical approach: instead of producing the legacy MOBI format (which Amazon has deprecated), we convert your EPUB files into universally readable formats. The Single HTML output creates a beautifully formatted document that Kindle devices can display via the built-in browser, and that can be read on any device with a web browser. The Clean EPUB output re-packages your book for optimal compatibility with modern ebook readers.

The conversion happens entirely in your browser using JavaScript and the JSZip library. Your EPUB file is parsed locally — we extract the OPF metadata, spine order, chapter content, and cover image without ever sending your data to a server. This means your books remain completely private, and the conversion works even without an internet connection after the page loads.

Whether you're trying to read a library ebook on your Kindle, want a portable HTML version of your book collection, or need to re-package an EPUB for better compatibility, ConvertToMobi handles it in seconds. Drag, drop, download — it's that simple.

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