Keyboard Tester
Press every key to light it up on a virtual keyboard and spot dead or stuck keys, with key code details for developers.
Last reviewed by the Radiatus Cloud team
Note: some browser/OS shortcuts (e.g. F11, Cmd/Win combos) may be intercepted before reaching the page. Tested keys stay highlighted so you can sweep the whole keyboard.
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Test your keyboard for dead keys
A sticky or dead key is a real annoyance, and testing every key finds them. This tool lights up each key on a virtual keyboard as you press it, so you can spot dead or stuck keys.
Why testing keys matters
A keyboard key that does not register, or one that sticks and repeats, is easy to overlook until it causes a typo at the worst moment, and it is hard to test systematically by just typing. A virtual keyboard that lights up each key as you press it lets you go through every key methodically and see immediately which ones respond and which do not. This is useful for diagnosing a suspected fault, checking a second-hand or new keyboard, or confirming a repair. It turns a vague sense that a key is faulty into a definite check.
Find the faulty key
It runs entirely in your browser, so nothing you enter is uploaded and it works without an account, keeping your data on your own machine.
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Frequently Asked Questions
How does the keyboard tester work?
It shows a virtual keyboard and lights up each key as you press the physical one, so you see which keys register and which do not.
Why test a keyboard systematically?
Because a dead or sticky key is easy to miss until it causes a typo, and typing normally does not exercise every key methodically.
What faults does it find?
Dead keys that do not register and stuck keys that repeat, by showing exactly which keys respond as you press them.
When is it useful?
Diagnosing a suspected fault, checking a new or second-hand keyboard, or confirming a repair worked.
Is my input uploaded?
No. The tester runs entirely in your browser.
Privacy & Security
Runs entirely in your browser. No data is sent to any server.
How to Use
Click the page and press keys one by one — tested keys stay highlighted. Use Reset to start a new sweep.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
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UtilityParse a User-Agent string into browser, engine, operating system and device. Explains why UA strings are unreliable and what to use instead.
QR Code Generator
UtilityGenerate QR codes for URLs, text, Wi-Fi and contact details. Adjustable error correction and size, produced entirely in your browser.
Credit Card Validator
UtilityValidate a card number with the Luhn algorithm and identify the issuing network from its prefix. Runs locally, nothing is transmitted.