I'm reading mostly PDFs on my Kindle Classic (e-ink) device. Most of my e-books are PDFs, and after converting them, I've find out it's easier for me to read original PDF than converted version.

However, how does the energy consumption look like? Consider the number of page changes is the same for both format, for which format the energy used to load/parse/process the energy consumption would be lower?

MOBI is designed to be easier to read on e-book readers, but are those readers designed to process that format more energy-efficient than the alternatives?

  • epub? not mobi?
    – asalamon74
    Commented Dec 31, 2013 at 20:30
  • @asalamon74 yes of course, I'm using practically only PDFs :)
    – user43
    Commented Dec 31, 2013 at 20:33
  • Is this LCD or eInk kindle?
    – DVK
    Commented Jan 1, 2014 at 19:44
  • @DVK added clarification.
    – user43
    Commented Jan 1, 2014 at 19:46
  • How is it easier to read a PDF than a MOBI on your Kindle? How do you need the same number of page turns for each format? as @AlexandreMarcondes mentions in the answer below, most PDF is inherently ugly on a kindle. Commented Feb 1, 2014 at 10:51

1 Answer 1


If the PDF file is not formatted to the size of your Classic Kindle screen (roughly A6 format or 6"x4") you will consume a lot more power because you will need to zoom in and out and navigate on the page in order to read it. A MOBI file does not have this kind of problem because it dynamically resize the text so you can read without interaction.

Your e-ink device (any Kindle generation) will be off while you read and will power on when you click on any button or on the screen. So as well as it is on sleep mode it will consume less power. The device only needs power to refresh the screen and redraw anything or change pages, thus any interaction that redraws anything consumes more power.

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