This is a small utility shared on the Geekhack forum so let's click on the attachment as shown below to download:
Tool Aqua Key Test is evaluated as their safe and check with the software Kaspersky Internet Security without finding any hazards.
KbTester utility is a free application from the French software company that helps you to check whether the common features on the keyboard are working normally or not. Software with interface used in French and a little English should probably not popular with us Vietnamese. However, this is also one of the free keyboard testing software worth a try.
Link to download the software at https://www.pages-informatique.com/kbtesterv0.4.php
Because the site is all French, use the text translation feature on Chrome, Coc Coc to translate the website. Next, click Download KbTester to download the software to your computer.
With the fast and accurate keyboard testing tools, readers can find out the status of your keyboard and feel secure to use it. Good luck!