Tutorial: Saving Multiple Images to Target File Size for Kindle MOBI

In a recent project, I converted a graphic novel originally destined for print to EPUB and Kindle (MOBI) formats. The author/illustrator reformatted any spreads to work on single pages, and provided me with nearly 300 images, each each of which would be a single page in the ebook. Rather than creating a fixed-layout ebook, I found the more efficient route in terms of was to create a regular reflowable ebook in EPUB format, then after filling out the metadata and adding various code tweaks, converting it to Kindle format using Calibre. Continue reading “Tutorial: Saving Multiple Images to Target File Size for Kindle MOBI”

iTunes Store Ebook Uploads: Image Size Limitations

Shortly after the I uploaded the epub file in my previous blog post, I received the following email from Apple:

Dear [hidden by AZ – this is a client],

Your book, vendor ID: [hidden by AZ], could not be delivered. The following images are larger than two million pixels and must be resized:

Full ePub:


To calculate the image pixels, multiply the image height by its width. For more information on image specifications, see the FAQ module on iTunes Connect.

Once you have corrected the issue, you can resubmit your book.


The iBookstore team

The screen resolution of the Retina display on the new iPad (aka iPad 3) is 1536 x 2048, or a total of 3,145,728 pixels, which is indeed a hell of a lot larger than two million. I thought I’d be clever and upload a cover that was precisely this size. Not allowed…or so I thought. Continue reading “iTunes Store Ebook Uploads: Image Size Limitations”