EPUB to MOBI Converter Guide
Read EPUB metadata client-side and get personalized Calibre/KindleGen conversion instructions — no upload to any server.
Use the EPUB to MOBI Converter Guide
EPUB File Inspector
Inspect metadata locally and generate Calibre CLI conversion commands.
Cover Preview
Upload an EPUB to see its metadata
Title, author, chapters, and conversion commands will appear here.
Book Metadata
Chapters / Spine
Conversion Instructions
- Install Calibre from calibre-ebook.com
- Open a terminal in the folder containing your EPUB
- Run the command below:
The output MOBI file will appear in the same directory.
- Obtain KindleGen from an archived source (Amazon no longer distributes it)
- Place kindlegen in the same folder as your EPUB
- Run the command below:
Summary
This tool reads your EPUB file entirely in the browser using JSZip — nothing is uploaded to any server. It extracts the OPF manifest to surface the book title, author, publisher, publication date, language, and chapter list. Once you see your book's details, the tool generates exact Calibre and KindleGen command-line instructions pre-filled with your filename so you can convert EPUB to MOBI in seconds.
How it works
- Click "Choose EPUB File" and select any .epub file from your device.
- JSZip opens the EPUB's zip container entirely in your browser — no server upload occurs.
- The OPF package manifest is parsed to extract title, author, publisher, date, language, and chapter list.
- Any embedded cover image is displayed as a preview.
- Step-by-step Calibre and KindleGen commands pre-filled with your filename are shown below.
- 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.