Document tool

EPUB to MOBI Converter

Convert EPUB ebooks to MOBI for older Amazon Kindle devices and apps.

EPUB MOBI
PrivConvert
Privacy-first conversion
No files stored
In-memory processing
Deleted instantly
No sign-up needed

Complete the security check to begin

EPUB vs MOBI

EPUB is the open ebook standard used by Apple Books, Google Play Books, Kobo and most readers. MOBI is Amazon's older format. Converting lets you read an EPUB on a legacy Kindle or in apps that still expect MOBI.

  • Kindle compatibility - open EPUB content on older Amazon devices
  • Structure preserved - chapters, headings and TOC stay intact
  • Offline & private - nothing is uploaded to a third party for storage

How to Convert EPUB to MOBI Online

Converting EPUB files to MOBI format is simple with PrivConvert. Our free online converter handles the entire process in your browser with no software installation required. Your files are processed securely in memory and never stored on our servers.

1
Upload your EPUB file

Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.

2
Automatic conversion

Once uploaded, the conversion from EPUB to MOBI starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.

3
Download your MOBI file

Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.

Why Choose PrivConvert?

Unlike other online converters that upload your files to remote servers, store them for days, and may use them for AI training or sell your data, PrivConvert was built with privacy as the foundation. Here's what makes us different:

Zero data retention

Files are processed in volatile memory (RAM) and immediately purged. Nothing is ever written to disk or backed up.

Encrypted transfers

All uploads and downloads are encrypted with TLS 1.3. Your files cannot be intercepted in transit.

No account required

Use any tool instantly without signing up, providing an email, or creating a profile. No tracking cookies, no user profiling.

Works on any device

Compatible with Windows, macOS, Linux, iOS, and Android. No plugins or desktop software needed - just a modern web browser.

EPUB vs MOBI - Format Comparison

FeatureEPUBMOBI
File extension.epub.mobi
Supported by PrivConvertYes (as input)Yes (as output)
Privacy-safe conversionIn-memory, zero storage
Max file size250 MB per file
Batch supportUp to 20 files simultaneously

Trusted by Thousands of Users

PrivConvert processes thousands of file conversions every day. Our commitment to privacy and security has made us the go-to choice for professionals, developers, and privacy-conscious users worldwide.

250 MB Max file size
120+ Conversion tools
0 sec File retention
100% Free to use

Frequently Asked Questions

Why convert EPUB to MOBI?
Older Kindle e-readers and the Send to Kindle workflow historically used MOBI. If your book is in EPUB and your device won't open it, MOBI is the compatible format.
Will my chapters and table of contents survive?
Yes. The converter preserves the book structure, chapter breaks, and navigation so your MOBI reads just like the original EPUB.
Is there a file size limit?
You can convert ebooks up to 250 MB, which is far larger than virtually any text-based EPUB.
Are my files private?
Completely. Conversion runs in an isolated, in-memory process. Your ebook is never stored, never shared, and is deleted the moment your download is ready.