LOCAL EBOOK CONVERTER / MOBI TO EPUB

MOBI to EPUB

Convert readable chapter text and core metadata from an unprotected MOBI into a clean EPUB 3 package with a generated table of contents.

Processed in this browserOne unprotected .mobi file up to 20 MB, 500 chapters, and 2,000,000 visible characters. DRM-protected and unsupported Kindle variants are rejected.

Step 1 / source

Choose the source

MOBI - 20 MB - no DRM

Drop one file here

Choose the readable mobi ebook you want to turn into text-focused epub 3.

Browse filesChecking publication status...

No file upload

This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.

Original stays unchanged

The converter creates a separately named output. It never writes back into the source file.

Bounded work

One unprotected .mobi file up to 20 MB, 500 chapters, and 2,000,000 visible characters. DRM-protected and unsupported Kindle variants are rejected.

Plain-language method

How MOBI to EPUB works

A browser MOBI parser reads metadata and spine chapters, Nirmion removes active content and proprietary resource references, keeps visible chapter structure, generates XHTML chapters and navigation, and writes a standards-based EPUB ZIP with an uncompressed mimetype entry.

01
Choose a valid source
Use a MOBI you own or are authorised to convert. Passwords and DRM are not accepted, removed, guessed, or bypassed.
02
Review the conversion choices
There are no conversion choices in this release. The output intentionally favours readable text and interoperable packaging over proprietary Kindle presentation details.
03
Inspect the separate result
The _nirmion_tools.epub contains title, author, language, identifier, ordered XHTML chapters, and navigation. Cover art, embedded images, original CSS, custom fonts, annotations, positions, and advanced Kindle layout are omitted.

Useful when

Practical jobs this tool handles

Move an old unprotected text ebook into an EPUB reader.
Create an interoperable reading copy of authorised content.
Recover chapter text and reading order from a legacy MOBI.

Before converting

Check the source and destination rules

Confirm ownership or conversion permission.
Review chapter boundaries and metadata.
Keep the MOBI until the EPUB opens correctly in your reader.

Know the boundary

Know what the destination format cannot keep

This is not a DRM-removal tool and does not promise full Kindle fidelity. Test the EPUB in at least one standards-based reader before deleting or distributing anything.

Quick answers

Questions before you convert

The conversion contract is deliberately explicit.

Can it convert DRM-protected Kindle books?

No. Protected or unreadable inputs fail without bypass attempts.

Are images preserved?

No. This release packages visible chapter text and core metadata only.

Is the result a real EPUB?

Yes. It uses EPUB 3 container, package, navigation, spine, and XHTML chapter files.