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Amazon Kindle has an excellent library of eBooks that you can read on your Kindle device. But sometimes the book you want is not available on the Kindle store. Here’s how to transfer any eBook to your Kindle using Caliber.

How to set up Caliber on your computer

We will use the free and open source eBook manager app Caliber. It is available on Windows, Mac and Linux. The app is packed with pro-level features but is also easy to use if you want to do something simple like manage your e-book library or transfer eBooks between devices.

The best part about Caliber is that it supports converting formats. You don’t have to worry about uploading files to the MOBI format (which is Amazon Kindle’s default eBook format). Even if you have eBooks in ePub format open, Caliber will convert the eBook for you before transferring it to your Kindle (as long as you are using a DRM-free eBook).

RELATED: What is a MOBI file (and how do I open one)?

Go to The Caliber website to download the application. After installing it, the Caliber Welcome Assistant will guide you through the installation process.

The first step is to choose a location for your Caliber library. You can use the default location or click the “Change” button to choose a different folder. If you plan to manage your entire eBook library using Caliber, we recommend that you use a Dropbox or iCloud Drive folder to store your Caliber library. Once you have chosen your preferred location, click on the “Next” button.

Change the Caliber Library folder and click Next

From the next screen, choose your Kindle model, then click the “Next” button.

Select your Kindle device and click Next

On the next screen, Caliber will ask you if you want to configure wireless email delivery for eBooks. If you have configured a Kindle email address, enter the details, then click the “Next” button. This is an optional step because we will not be using the email method to transfer eBooks.

Choose Kindle Email and click Next

Now you have finished configuring Caliber. Click the “Finish” button to launch the Caliber application.

Click on the Finish button to exit the Caliber wizard

RELATED: How to Back Up Your Kindle Highlights and Notes

How to Transfer Books to Kindle Using Caliber

Now that you’ve opened the Caliber eBook Manager app on your Windows PC, Mac, or Linux computer, it’s time to add your downloaded books. You can use both MOBI and ePub format e-books.

To add eBooks to Caliber, simply drag the eBook into the Caliber window from where you saved it on your computer.

Drag a book into the Caliber window to import it into the library

In a second or two, Caliber will import the eBook and retrieve the associated metadata, book details, and cover art.

Caliber interface displaying an imported book

Connect your Kindle to your computer using a USB cable. Once your Kindle is recognized by Caliber, you will see a new “On Device” column next to the book title column.

Now let’s transfer the eBooks to Kindle memory. Select a book (or multiple books), and then right-click the selected eBook (s). In the contextual menu, click on the “Send to device” button, then choose the “Send to main memory” option.

Click on Send to main memory

If you selected a MOBI eBook, the transfer will complete in a second or two. If you have selected a ePub eBook, Caliber will ask you if you want to convert the book before the transfer. Here, click on the “Yes” button.

Click Yes to convert the book

Caliber will convert the eBook first and then transfer it. It will take a little longer, depending on the size of the eBook.

You can click on the “Jobs” button in the lower right corner to follow the progress.

Click on Jobs to monitor the book transfer

From there, you can see a history of all imports, conversions, and transfers across all of your devices.

Jobs section in the Caliber application

Once you have transferred all the desired eBooks to your Kindle, it is time to safely eject the device. You can do this directly from Caliber.

In the top toolbar, click the drop-down icon next to the “Device” button and select the “Eject this device” option.

Click Eject this device

You can now unplug the Kindle device from your computer and start reading the book you transferred.


You can do a lot more with Kindle outside of the Amazon ecosystem. For example, you can search and save all your highlights and notes from your Kindle device without using third-party software.

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