W
An older Kindle
Devices that lost wireless service still take a MOBI over the cable perfectly well, which keeps a working Kindle working.
50 BOOKS AT ONCE · CHAPTERS AND COVER KEPT · NO INSTALL
EPUB to MOBI.
Convert EPUB books into MOBI files for your Kindle. Plug the Kindle in, copy them across, and they appear in your library with their chapters and cover intact. Up to 50 at a time. Worth knowing before you start: if you can email books to your Kindle, you probably do not need this conversion at all — the section below explains when you do.
Convert EPUB to MOBI
Up to 50 files
Drop EPUB files here or browse
MOBI
MOBI
MOBI
MOBI
MOBI
+45
Your MOBI files are ready
Converted
MOBI · chapters · no watermark
MOBI
MOBI
MOBI
MOBI
MOBI
MOBI
+ 12 more queued
Upload your EPUBs, get MOBI files back. This is the whole app.
Every conversion is anonymous — we never track who converts what
4.8 / 5
· 10,000+ paid
€1 day pass · €6 yearly · €30 lifetime · no ads, ever
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€1 day pass · €6 yearly · €30 lifetime · no ads, ever
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One account unlocks all 79 AppsCyborg tools
One account unlocks all 79 AppsCyborg tools — convert, compress, download and extract, across video, audio, images, PDF and more. See all tools →
Two steps. That's it.
1
Upload your EPUBs
One book or 50 at once
2
Download the MOBI files
EPUB
novel.mobi
MOBI · no watermark
Grab it within the hour. Download links expire 60 minutes after conversion. Copy the file into the Kindle's Documents folder over USB and it appears in your library. Coming from a Word document rather than an EPUB? That's Word to MOBI Cyborg.
Why a paid converter is the one worth using
Free e-book converters are funded by advertising, and it shows in the limits: one file at a time, a size cap, and a queue. If you are moving a shelf of books onto a Kindle rather than a single title, the batch is the whole point.
50 books in one pass
A whole series, a backlog you have been meaning to read, everything you downloaded from a public-domain library. Queue the lot instead of feeding them in one at a time.
Anonymous & private
Your library stays yours. We don't track who converts what, and files are never handed to third parties.
No watermark, no sign-up wall
Nothing is stamped into your book and nothing is held back for a paid tier. What you download is the file.
Try it for €1
A 24-hour day pass costs €1. No subscription, no auto-renewal — enough to convert a shelf and check the results on the device.
START HERE
Day pass
€1
/ 24 hours
Just need a batch converted today? Unlimited conversions for 24 hours. No commitment.
- Unlimited conversions for 24h
- No subscription, no auto-renew
Yearly
€6
/ year
The price of a coffee, once — for a whole year of conversions.
- Unlimited for 365 days
- Best value if you convert often
Lifetime
€30
once
Pay once, own it forever. Every future format and update included.
- One payment, never again
- All future updates included
Every plan unlocks all 79 AppsCyborg tools — no ads, no watermarks, plus a 7-day money-back guarantee.
How €1 compares to “free”
| EPUB to MOBI Cyborg | Free online converter | Desktop app | |
|---|---|---|---|
| Files per batch | 50 | 1 | Many |
| File size cap | 200 MB per file | Capped, often 10–25 MB | None |
| Daily conversion limit | None | 1–2 / day | None |
| Nothing to install | Desktop app | ||
| Ad-free & untracked | Ad-funded | ||
| Price | from €1 | Free (ad-funded) | €20–60 |
Free EPUB-to-MOBI tools exist because advertising pays for them, and the model shows: one file at a time, a size cap, a queue, and an upgrade prompt when you drag in a second. Installing Calibre on your own machine is a genuinely good answer and costs nothing — it is the same conversion engine we run — but it is a desktop program to install, learn and keep updated. EPUB to MOBI Cyborg starts at €1 for a day, installs nothing, and takes 50 books at a time at up to 200 MB each.
When you need this, and when you don't
Both formats are reflowable e-books, so this is a clean conversion — chapters, cover and metadata all carry across and the Kindle treats the result like any other book. The honest question is not whether it works. It is whether you need it, because Amazon changed the answer a couple of years ago and a lot of guides have not caught up.
50
books per batch
200
MB per book
60
minutes to download
0
watermarks
You may not need to convert at all
!Send to Kindle accepts EPUB directly now and converts it on Amazon's side. If you can email or upload books to your Kindle, send the EPUB as it is and skip this page — that is genuinely the easier route.
When the cable is the only way
USBAn older Kindle with no working wireless service, a device you would rather not register, a book you want on the thing without it passing through Amazon at all. That is what MOBI over USB is still for, and it works.
Chapters and cover survive
✓Both sides are e-book formats, so the structure maps across cleanly: the chapter list, the cover and the title and author all arrive intact.
Copy-protected books are refused
DRMBooks bought from a shop or borrowed from a library are locked to an account and nothing here can open them. The file is refused rather than half-converted.
Nothing stamped on it
cleanNo watermark, no advert chapter appended at the end, no banner on the cover. The file is your book and nothing else.
The honest caveat: Amazon is retiring MOBI
MOBI still opens on a Kindle and copying one across by cable still works, but the format is on its way out and it would be dishonest to sell this page without saying so. Amazon stopped accepting MOBI through Send to Kindle at the end of 2023 and stopped accepting it for publishing in March 2025, and in the same period it began dropping wireless service for Kindles made before 2013, pushing those devices to USB-only. So the case for converting is narrower than it was: an older Kindle, a sideload-only workflow, or a book you would rather not route through Amazon. If none of those describe you, send the EPUB with Send to Kindle instead — Amazon converts it on the way in and you skip a step. We would rather tell you that here than take a euro for a conversion you did not need.
Prefer to go wireless? Send to Kindle takes an EPUB as it is. Coming from a document instead? Word to MOBI Cyborg.
See it in action
EPUB to MOBI Cyborg, start to finish · Watch the walkthrough →
A short walkthrough: drop the files in, watch them convert, download the MOBI files. That's the whole tool.
Ready to try it? Create your account above.
Who still converts EPUB to MOBI
Fewer people than a few years ago, and for more specific reasons:
R
Sideloading a whole shelf
Fifty public-domain books at once, converted and copied across in one go rather than emailed one at a time.
P
Keeping Amazon out of it
Send to Kindle means the file passes through Amazon's servers. A cable does not, and for some books that matters.
F
A tidy library
Converted books sit alongside bought ones with covers and chapter navigation, rather than as loose documents.
T
Working offline
No account, no email round trip, no waiting for delivery — the file is on the device as soon as you eject it.
S
Archiving in both formats
Keeping a MOBI alongside the EPUB so an old device and a new one can both read the same book.
If one of those is you, upload your EPUBs and get MOBI files back.
Different format — or the other direction?
Going back to EPUB? MOBI to EPUB. Starting from a document rather than a book? Word to MOBI and Word to EPUB. Need the text back as something editable? EPUB to Word and MOBI to Word — all included in one account.
Common questions
Getting started
What is EPUB to MOBI Cyborg?
A web app that converts EPUB books into MOBI files for the Kindle, keeping the chapter list, the cover and the book's title and author. Upload up to 50 at a time — nothing to install and no watermark.
Does it work on a phone?
Yes. It works on all Android phones, and on iOS 12 and higher. Conversion happens on our servers, so a phone finishes as fast as a desktop — you only need a browser.
How do I convert EPUB to MOBI?
Two steps. Drag your books onto the upload box at the top of this page — up to 50 at a time — then collect the result. One book comes back on its own; a batch comes back as a single ZIP. There is nothing to install and no settings to pick.
Structure, size & batches
Do I actually need to convert, or can I just send the EPUB?
For most people, just send the EPUB. Send to Kindle has accepted EPUB since 2022 and converts it on Amazon's side, so if you can email or upload books to your device that is the shorter path and this page is unnecessary. Converting is worth it when the cable is your route: an older Kindle without working wireless service, a device you have not registered, or a book you would rather not send through Amazon at all.
How do I get the MOBI onto my Kindle?
Over the USB cable. Plug the Kindle into your computer, open it like a drive, drop the file into the Documents folder and eject — it appears in your library with the rest of your books. You cannot email a MOBI to a Kindle any more: Amazon removed MOBI from Send to Kindle at the end of 2023.
How many files can I convert at once?
Up to 50 per batch. Each result is named after the book it came from. One book comes back on its own; a batch comes back as a single ZIP.
Is there a file size limit?
200 MB per book, far more than an EPUB needs — you would only approach it with hundreds of high-resolution images embedded. A conversion that somehow runs longer than five minutes is stopped rather than left hanging.
Why does my book fail to convert?
Almost always because it is copy-protected. Books bought from Kobo or Google Play Books, and anything borrowed through a library, are locked to the account that got them, and no converter can open them — ours refuses the file rather than producing something broken. Books you made yourself, files from Project Gutenberg and Standard Ebooks, and anything sold DRM-free all convert normally.
Will the cover and chapters survive?
Yes. Both formats are reflowable e-books built on the same ideas, so the chapter list, the cover image and the title and author all carry across. The Kindle shows the result the way it shows any other book.
Is MOBI still worth using at all?
For sideloading, yes — it opens on a Kindle and copying it across by cable works. Beyond that the format is being retired: Amazon dropped MOBI from Send to Kindle at the end of 2023 and from KDP publishing in March 2025, and it is winding down wireless service for pre-2013 devices. MOBI files already on a Kindle keep working. If you have a modern Kindle and a working Send to Kindle, EPUB is the better target and you do not need this conversion.
Pricing, privacy & limits
How much does it cost?
A €1 day pass gives you 24 hours of unlimited conversions. Yearly (€6) and lifetime (€30) plans are also available (+ VAT). Every plan unlocks all 79 AppsCyborg tools, not just this one.
How long does my download link stay valid?
60 minutes. After that the link expires and the converted files are removed — just re-run the conversion if you need them again.
Do you track or keep my files?
No. We don't run ad or analytics tracking on what you convert, and your files are never sold or shared for marketing. Uploaded books are processed only to build your MOBI files and are removed once the 60-minute download window closes.
Is there a limit on how often I can convert?
No. While your day pass, yearly or lifetime plan is active you can run as many 50-file batches as you like — there is no monthly quota and no per-conversion charge.
Still have a question?
We usually reply within a day.
Your Kindle files are minutes away.
Create an account and upload your books — up to 50 at once, chapters and cover kept, no watermark.
Free account
€1 day pass
Anonymous
Creating your account is free — you only pay when you convert
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