How we test ebook readers

We put ebook readers through a series of gruelling lab tests. Whether you're using your ebook reader on a beach, in bed or while squashed on a train, we'll be able to recommend one that won't disappoint.

Each ebook reader we review is put through its paces using a combination of tests designed to mimic how you'll use your device in real life. 

We test whether ebook readers can stand up to the bumps and scratches that come with living at the bottom of your bag, and see how easy they are to read in different light conditions.

No matter how and where you intend to use your e-reader, we'll be able to tell you which model is the perfect fit for you. Our ebook-reader reviews answer common questions such as:

• What's the screen quality like?
• How easy is it to read in different light conditions?
• How durable is the device?
• Is it easy to download books from the ebook store?
• Should I buy it?

With the help of our experts, we rate every ebook reader passing through our test lab, offering a comprehensive review that you can trust.

Head over to our ebook reader reviews to see which models offer great value for money.

Video: How we test ebook readers

How we assess ebook reader screen quality

Ebook readers are designed to accompany you anywhere and everywhere, which is why it’s essential that they’re easily readable in all sorts of conditions. 

We run a series of screen-quality tests in different light conditions to see how well each device performs.

Ebook reader viewing test 

We get three experienced assessors to use every ebook reader in bright sunlight. We then change the intensity of the light – just like when you're reading on the beach and the sun goes behind a cloud. From this, we can see whether the ebook reader screen adapts to changing light conditions and whether it remains comfortable to read. 

We also test ebook readers in living room conditions and in near darkness. This is to see how the built-in light copes, so you'll know if a device will work the way you want it to at night. 

This means our ebook reader reviews can provide you with a clear picture of how each model behaves in a variety of situations.

Contrast measurement 

We use a luminance meter to measure the contrast value so we can provide an accurate assessment of the contrast ratio.

The measurement is taken in three different light conditions: 

• Direct illumination with daylight source 
• Indirect illumination with fluorescent lamps in office surroundings 
• Indirect illumination with bulb lamps in office surroundings.

This test helps us determine the quality of the display.

Just want to see which ebook readers we recommend after our independent lab tests? See our expert pick of the best ebook readers for all budgets

How durable is the device?

Following feedback from Which? members reporting that some ebook-reader screens break too easily, we’ve incorporated durability into our test programme.

We run two tests to investigate how sturdy each device is. Some ebook readers prove to be much sturdier than others, though we'd still recommend you use a case to protect your device if you're tossing it into a bag.

• The scratch test is performed with a stylus test pencil. We increase the force of the stylus point to a level where first scratches or other problems appear. Our tests reveal large differences in the resilience of each device.
• The drop test simulates the effect of an impact on the ebook reader by dropping it in a tumbling drum six times. After the test we rate the amount of damage. In cases of serious damage, we repeat the test using a second sample.

Is it easy to download books from the store?

Getting books onto your device is crucial to the ebook-reader experience. After all, you don't want to waste valuable reading time wrestling with an awkward-to-use online store.

If the process isn't smooth and simple, it can leave you wishing you’d packed a paperback instead. 

We assess how easy it is to download books onto the device, as well as what file formats are supported, whether you're tied to one ebook store and if there's an option to borrow books for free from an online library.

Should I buy it?

Using all of our independent test data, we award each ebook reader a total test score so that you can easily see which are the best and worst. The score that we give each ebook reader is made up of a combination of elements – you can see the breakdown below.

Please note that we don't take price into account. However, we do give Great Value logos to high-performing devices that are cheaper than your average Best Buy.

• 50% performance
• 25% ease of use
• 15% features
• 5% durability
• 5% battery

An ebook reader has to achieve 74% or more to be a Best Buy. Our best ebook readers guide has more tips on picking the model that's right for you.