When you click on a retailer link, we may earn affiliate commission, which helps fund our not-for-profit mission. This tracks your activity using third party cookies. By clicking a link you are consenting to this.
A knife sharpener is a must-have for your kitchen if you don't want to end up hacking away and turning your tomatoes into a pile of pulp rather than sleek slices.
In March 2021, we tested nine handheld knife sharpeners from Lakeland, Joseph Joseph, Robert Welch and more. As well as comparing these against each other to discover the best knife sharpener, we also compared them with a traditional whetstone used for sharpening knives to see which gives better results.
Pricing and availability last checked: 9 April 2023
Tips for living well - get our free Food & Health newsletter: shop savvy, eat well, stay healthy
Only logged-in Which? members can view the knife-sharpener test results. If you're not a member, or not yet logged in, you'll see an alphabetically ordered list of the handheld knife sharpeners we tested.
Join Which? to get instant access to our test results and recommendations below.
Cheapest price: £6 available at ASDA, also available at Amazon, AnySharp, Lakeland.
Size and weight: 7 x 6 x 6cm, 61g
Suitable for serrated edges: Yes
Other key features: Suction pad
The AnySharp knife sharpener is a compact device that fits easily in any kitchen drawer.
This knife sharpener has a suction pad to lock it in place on your countertop when in use.
AnySharp claims this is the 'world's best knife sharpener' – a bold claim considering that it's also the cheapest we tested.
Find out whether paying less gets you more. Log in or join Which? to read our full review.
Cheapest price: £32 available at John Lewis, also available at Amazon, Lakeland.
Size and weight: 12 x 13 x 4cm, 624g
Suitable for serrated edges: Yes
Other key features: No extras
The Chantry Knife Sharpener is short and stout, and the heaviest we tested.
It has two spring-loaded steels that rotate as you use it.
Log in or join Which? to find out how it compared with others we tested.
Only available at Amazon: £47.99.
Size and weight: 7 x 24 x 8cm, 189g
Suitable for serrated edges: No
Other key features: Coarse and fine setting
This knife sharpener from Global was the priciest one we tested, and has not one but two sharpening wheels.
The first, according to Global, is to sharpen your kitchen knife, and the second to hone the blade.
To find out whether the extra sharpening wheel means a better result, log in or join Which? to read our full review.
See our reviews of the best kitchen utility knives, best chef's knives, best bread knives and best knife sets.
Only available at John Lewis: £15
Size and weight: 9 x 13 x 3cm, 113g
Suitable for serrated edges: Yes
Other key features: No extras
This John Lewis knife sharpener is a simple design that's compact and light for its size.
Was it a case of small but mighty when it came to sharpening knives? To find out, log in or join Which?.
Cheapest price: £16 available at Amazon, John Lewis, also available at Joseph Joseph, Selfridges & Co.
Size and weight: 4 x 20 x 4cm (when rotated closed 4 x 13 x 4cm), 121g
Suitable for serrated edges: No
Other key features: Coarse and fine setting, folds for storage
This knife sharpener from Joseph Joseph is able to fold in half for storage, and has a rotating arm.
The sharpener has two settings: one to sharpen the blade and the other to hone it.
The real test, though, is how well it sharpens. To find out how it did in our tests, and to see our full review, login or join Which?.
Cheapest price: £19.95 available at Amazon, also available at John Lewis (out of stock), Kuhn Rikon.
Size and weight: 7 x 18 x 6cm (when collapsed 7 x 12 x 6cm), 143g
Suitable for serrated edges: Yes
Other key features: Collapsible for storage
This Swiss-designed knife sharpener has two settings: one to sharpen the kitchen knife and the other to hone the blade.
It's collapsible, so it takes up less space while in storage.
How did it fare in our tests? To find out, log in or join Which? to unlock the full review.
Only available at Lakeland: £16.99.
Size and weight: 8 x 22 x 4cm, 257g
Suitable for serrated edges: No
Other key features: Two-stage honing for both Japanese and European-style knives.
Get two sharpeners in one – this handheld knife sharpener has a setting to hone and sharpen both Japanese and European-style kitchen knives.
How did it do in our tests? To find out, log in or join Which?.
Only available at ProCook: £12.
Size and weight: 6 x 17 x 4cm, 66g
Suitable for serrated edges: No
Other key features: No extras
This ProCook knife sharpener has a simple design. But that's no bad thing if it sharpens knives well.
Log in or join Which? to find out whether it does.
Cheapest price: £27.99 available at Lakeland, also available at John Lewis, Robert Welch.
Size and weight: 7 x 9 x 5cm, 294g
Suitable for serrated edges: No
Other key features: No extras
The Robert Welch sharpener is arguably one of the more elegantly designed knife sharpeners we tested.
But is this a case of style over substance? To find out, log in or join Which?.
Whetstones are a different way of sharpening knives. They're sometimes known as sharpening stones, and are essentially a two-sided block of coarse stone (one side more coarse than the other) and a base/holder.
We tried one out alongside the knife sharpeners we tested to see how the two compared, and discovered that a whetstone is much harder to use. To get a good result you need skill and practice, plus considerable patience.
Once you've mastered a whetstone it does sharpen knives brilliantly, but you'll end up with a mess wherever you choose to use it, which you won't see with a knife sharpener.
A honing steel (sometimes also called a honing rod or a sharpening steel) doesn't exactly sharpen your knife. What a honing steel does is to realign the cutting edge to smooth out microscopic bumps and jagged edges.
To use a honing steel:
Little and often. If you hone a knife frequently then you shouldn't need to sharpen it as much. Hone it for every couple of hours of use.
It's essentially taking away a bit of the metal each time, but it's so little that you won't notice.
There are two easy ways to test the sharpness of your knife.
First, we blunted 10 identical knives using a whetstone.
We used the Gourmet X30 chef's knife from ProCook.
We then examined each of the knives to make sure we were satisfied that each was blunted to the same degree.
We used one of each of these knives to test each knife sharpener, following the manufacturers' instructions.
We rated each knife sharpener on how easy it was to use for sharpening a knife.
We examined the cutting edges of each blade, checking for any still-blunt areas. If there was no reflected light across the cutting edge of a blade, we gave it a higher rating.
We took each sharpened knife and used it to slice the following items in half:
We investigated the most popular and bestselling brands from national retailers. We chose one handheld knife sharpener per brand in our selection.
We bought all the products we tested.