EPUB to MOBI Converter Guide

Summary

Read EPUB metadata client-side and get personalized Calibre/KindleGen conversion instructions — no upload to any server.

How it works

1. Click "Choose EPUB File" and select any .epub file from your device.
2. JSZip opens the EPUB's zip container entirely in your browser — no server upload occurs.
3. The OPF package manifest is parsed to extract title, author, publisher, date, language, and chapter list.
4. Any embedded cover image is displayed as a preview.
5. Step-by-step Calibre and KindleGen commands pre-filled with your filename are shown below.
6. Copy the command for your preferred tool and run it in your terminal to produce the MOBI file.

Use cases

• Verify an EPUB's metadata before sending it to a Kindle device.
• Inspect chapter structure and table of contents of a downloaded EPUB.
• Get the exact Calibre command to batch-convert a specific file to MOBI.
• Check author and publisher info embedded in a purchased or free EPUB.
• Confirm language and encoding of an EPUB before conversion.
• Preview a book's cover art without opening a full e-reader app.
• Learn the KindleGen CLI syntax for MOBI conversion with a real example.
• Audit EPUB metadata for self-published authors before distribution.

Frequently Asked Questions