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Logitech K840 Mechanical Keyboard Review

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The Logitech K840 delighted expert testers with its remarkably low latency and typing noise. They were pleased that its Romer-G Tactile key switches offered an excellent typing experience but were disappointed with its lack of backlighting. They also complained that its keys were not programmable and lamented the absence of a wrist rest.

What Is Not on the Box

What the brand doesn’t always tell you…

our Verdict

The Logitech K840 had testers happy with its exceptionally low latency and relatively quiet typing noise. Expert testers from Rtings did not notice or complain…

The Logitech K840 had testers happy with its exceptionally low latency and relatively quiet typing noise. Expert testers from Rtings did not notice or complain about any lagging during their tests, and they were also pleased with typing quality. They credited their good typing experience to the keyboard’s Romer-G Tactile key switches, which they also credited as the main reason why its typing noise was very low. As a result, they deemed it fit for office use, Reviewers from 9to5 Toys were also impressed with the K840’s build quality, as they found it quite sturdy.

However, product reviewers were not very happy with its lack of backlighting. Being a drawback that it shares with the Logitech K480 (which we’ve covered in our Logitech K480 Bluetooth Multidevice keyboard review), it might be challenging to use in low light conditions. They were also dissatisfied with its lack of programmable keys and missing wrist rest.

True Score


Reasons to Buy

  • Outstandingly low latency
  • Good build quality
  • Low typing noise
  • Good typing experience
  • Full-size keyboard

Reasons to Avoid

  • No backlighting
  • No wrist rest
  • Keys are not programmable


  • Foldable
  • Form Factor
    Full size
  • Key Switch Behavior
  • Keyboard Technology
  • Multimedia Keys
  • Numeric Keypad
  • Palm Rest
  • Spill Resistant
  • Touchpad


Launched in 2017, the Logitech K840 is an entry-level mechanical keyboard that has an excellent 2.1ms latency, which is quite common with some of the best keyboards on the market. This low latency means it is very responsive to key presses, and since it ships with Romer-G tactile switches, typing on it feels quite comfortable. The wired keyboard offers one incline setting, and even though its cord is not detachable, it extends to a comfortable 5.9ft. Being a full-size keyboard, the K840 will also take up a decent amount of desk space, measuring about 17.5 by 5.2 inches. The K840 does not have a backlight, but if this is something that cannot be compromised on, then the Logitech G815 with its RGB backlighting may be well worth looking into. Find out what else it has to offer by reading through our Logitech G815 LIGHTSYNC RGB review.

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Customer Score



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True Score


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Expert Score Breakdown

  • Rtings

    Trust Score

    The Logitech K840 is okay for gaming. While the Romer-G tactile switches are fine for… read more

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