Why you need this
Books from the Amazon store appear on your Kindle automatically. But if you downloaded a book elsewhere or converted it yourself, you need a different delivery method. There are four main options — here's what each one is good for.
Method 1 — Email via BooksTuner
The most convenient option for FB2 files: upload, convert, and send in one step.
- Go to BooksTuner and upload your file
- Edit metadata if needed — title, author, cover
- For FB2 files, make sure the "Convert to EPUB" checkbox is checked
- Enter your Kindle email address and click "Next"
The book arrives wirelessly — no cable, no apps to install.
Before the first send, add no-reply@tech.bookstuner.app to your approved senders list once: amazon.com → Content & Devices → Preferences → Approved Personal Document E-mail List → Add a new e-mail address.
Pros: works in the browser, FB2 converts automatically, you can fix the cover and metadata, no cable needed.
Cons: Amazon's 25 MB attachment limit applies, one-time approved sender setup required.
Method 2 — USB cable
Connect your Kindle to a computer via USB — it shows up as a flash drive. Copy your file into the documents folder.
Kindle supports EPUB, MOBI, PDF, and a few other formats natively. FB2 won't open without conversion first.
Pros: no internet needed, no file size limit, easy to transfer multiple books at once.
Cons: requires a cable, no automatic FB2 conversion.
Method 3 — Send to Kindle app
Amazon's official desktop app for Windows and Mac. Drag a file into the window or right-click and choose "Send to Kindle."
Download: amazon.com/sendtokindle
Pros: official Amazon app, simple interface, wireless delivery.
Cons: requires installation, Windows and Mac only, FB2 not supported.
Method 4 — Calibre
Calibre is a free desktop program for managing your ebook library. It converts formats, edits metadata, and sends books to your device via USB.
Pros: converts FB2 and dozens of other formats, full metadata editor, free and open source.
Cons: requires installation and setup, steeper learning curve than the other methods.
Comparison
| Method | Cable needed | Converts FB2 | File size limit | Difficulty |
|---|---|---|---|---|
| BooksTuner | No | Yes | 25 MB | Easy |
| USB | Yes | No | None | Easy |
| Send to Kindle | No | No | — | Easy |
| Calibre | Yes | Yes | None | Medium |
If your book is in FB2 format, BooksTuner is the most straightforward option — conversion and delivery in one step, no software to install.