Skip to content
Fylane
Get API key

Free tools › Documents

EPUB to MOBI

Chapters, pictures, title and author carried into a MOBI every Kindle reads.

More free conversions, where you upload. The Fylane extension does the same work inside any upload form, on its own free share every day.Add to Chrome

How to convert EPUB to MOBI

  1. Drop the .epub file.
  2. Nothing to choose.
  3. Press Convert and download the MOBI.

What happens to your file

The EPUB is opened as the ZIP it is; its chapters are read in spine order, its pictures collected, and the lot is written as a MOBI 7 — the Kindle’s classic file, PalmDOC-compressed, with the title, author and language in its metadata. No Calibre, no kindlegen: a writer of Fylane’s own.

Send to Kindle now takes EPUB directly; a MOBI is for a device loaded over USB, an older Kindle, or a reader that asks for it. Styling beyond what MOBI 7 knows (fonts, CSS layout) is simplified.

Questions

AZW3 (KF8) out?

Not yet — MOBI 7 is what every Kindle since the first reads. For a new Kindle, send the EPUB itself.

Is the book’s DRM removed?

No, and a DRM-locked book is refused; this converts books you may convert.

Do it once, not on every form

Fixing a file here means downloading it and going back to the form. The Fylane extension does this work inside the form instead, on the file you already have.

And it keeps the result. The next application that asks for a résumé, a cover letter and a photo fills all three from one tap, each one refitted to what that site accepts.

Your files stay in the browser, encrypted, on your machine. Nothing is uploaded to keep them and nothing is sent anywhere to fill a form.

Filmed from the extension: three upload fields on a job application, filled from one tap.

Add to Chrome — freeWhat it does

Do this in code

curl -X POST https://api.fylane.dev/v1/jobs \
  -H "Authorization: Bearer $FYLANE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "file_id": "<file id>",
    "operation": "ebook.convert",
    "options": {
      "format": "mobi"
    }
  }'

The same operation, ebook.convert — EPUB to Kindle MOBI, or MOBI / AZW / AZW3 to EPUB (`format`), both shapes read and written in-house: chapters, pictures, title, author and language kept; a KF8-only AZW3 read best effort. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.