Keyboard Tester
Press each key and watch it light up on a full keyboard layout, with key codes, rollover and chatter checks.
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Full layout with tested keys
Main keys, function row, navigation cluster and numeric keypad light up while held and stay green once tested, so missed keys stand out.
Key, code and location
See the character, the physical key code, the legacy key code and whether a left, right or keypad key sent it.
Rollover and chatter checks
Hold several keys to see how many register at once. A key that re-triggers within 30 ms of release is flagged as possible chatter.
How to test a keyboard online
- 1
Select Start test or click the keyboard area.
- 2
Press every key, and hold several together to check rollover.
- 3
Look for keys that never turn green or are flagged for chatter, then press Esc twice quickly to stop.
What people use this tool for
- Check a new or second-hand keyboard before the return window closes.
- Find a dead or double-typing key after a spill or cleaning.
- Confirm how many keys a gaming keyboard registers at once.
Frequently Asked Questions
How do I test my keyboard?
Select Start test, then press every key once. Each key turns green after it registers. Keys that never turn green may be faulty, remapped or blocked by your operating system.
Why don't some keys register?
Your operating system or browser handles some keys before web pages see them, such as Fn, the Windows key with some shortcuts, media keys, Print Screen on some systems and browser shortcuts like Ctrl+W. Their absence here does not prove the key is broken.
What is key rollover and ghosting?
Rollover is how many keys a keyboard reports at the same time. Hold a group of keys and watch Most held at once. If a pressed key never lights up while others are held, the keyboard may be blocking or ghosting that combination.
What does possible chatter mean?
Chatter is a worn or dirty switch sending a second press you did not make. This tester flags a press that arrives within 30 ms after the same key was released. Repeat the test slowly to confirm before replacing a switch.
Does it work with non-US layouts and laptops?
Yes. Keys are matched by their physical position, so the layout shows US labels while the Key readout shows the character your layout produced. Keys outside this layout, such as an extra ISO key, appear under Other keys detected.
Is anything recorded or uploaded?
No. Key presses are only shown on this page while the test runs and are cleared when you reset or leave. Phone on-screen keyboards often do not send physical key events, so use a connected keyboard.