Keyboard Test Online
Check every key works
The Keyboard Test lets you press every key on your keyboard and highlights each one on a visual layout as it registers. It is the fastest way to check for stuck keys, broken switches, or keys that do not register correctly. Use it after spills, drops, or when buying a used keyboard.
How to Use
- 1Click the test area to focus it
- 2Press each key on your keyboard one at a time
- 3Keys that register correctly will highlight on the virtual keyboard
- 4Any key that does not highlight may be faulty
The Four Faults This Tester Catches
A dead key is only the most obvious failure. Run through your whole board and you can catch four distinct problems. A key that never highlights points to a broken switch, severed trace, or debris blocking the contact. A key that highlights twice from one press has switch chatter, a worn contact that bounces, and it will sprinkle doubled letters through everything you type.
A key that highlights only when pressed hard is a dome or spring losing tension, the early warning before total failure. And several keys failing together in a row or column usually means liquid damage to the internal matrix rather than individual switch faults, because those keys share a circuit path.
How Long Should a Keyboard Last?
Mechanical switches carry ratings of 50 to 100 million keypresses per switch, which translates to many years of heavy daily typing. Membrane boards have no per-switch rating and typically wear out as a whole when the rubber dome sheet fatigues, often within 2 to 5 years of heavy use, with frequently hit keys like E, A, and the spacebar going first.
A used keyboard is worth testing before money changes hands. Thirty seconds on this tester reveals problems a visual inspection never will, and a board that passes every key with consistent feel has plenty of life left regardless of its age.
What is a Good Score?
Every key on your keyboard should register. If any key does not highlight, it may have a hardware fault, debris under the keycap, or a driver issue.
Tips to Improve
- →If a key fails, try removing the keycap and cleaning underneath with compressed air
- →Test in multiple browsers — a key that fails in Chrome but works in Firefox may indicate a browser-specific issue
- →For mechanical keyboards, a switch that double-registers may need cleaning or replacement
Frequently Asked Questions
Why does my keyboard test show some keys not working?
Possible causes include debris under the keycap, a faulty switch, keyboard firmware issue, or a driver problem. Try cleaning first, then testing with another device to isolate the problem.
What is keyboard ghosting?
Ghosting occurs when a keyboard fails to register certain key combinations pressed simultaneously. Gaming keyboards with N-key rollover (NKRO) prevent ghosting by registering every key independently.
What is N-key rollover (NKRO) and do I need it?
N-key rollover means the keyboard can register every key pressed simultaneously, no matter how many are held at once. Most gaming keyboards offer 6-key or full N-key rollover. For gaming and fast typing, NKRO prevents missed inputs when multiple keys are pressed together — particularly important for chord-heavy games and shortcuts.
Spilled something? Bought second-hand? Tap through every key above and know for sure in under a minute.
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Built and maintained by Abdul Shakoor. Every test runs locally in your browser, free with no signup.