Keyboard Click Tester - Test Any Keys - Check Key Press - Button Checker & Detector

Press any key to see it light up on the virtual keyboard. Detect missing, stuck, or double-registering keys instantly. Track how many of your 104 keys have been tested.

0 / 104 Keys Tested
10%
25%
50%
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100%
Coverage
0 / 104
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Keyboard Click Tester
Press Start Test, then press any key
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Last Key
0
Unique Keys
104
Not Tested
0
Total Presses

🔎 What to Look For

Working keyLights orange
Currently heldStays bright
Missing keyStays dark
Chattering switchCount badge >1

Session Stats

Keys Tested0
Coverage0%
Total Presses0
Most Pressed—
Tests Run0

Recent History

No tests yet. Complete a test to see history.

Test Mode

Match the target to your keyboard's key count.

Keyboard Coverage Guide

100%
✅ Full Coverage
All 104 keys
75–99%
High Coverage
78–103 keys
50–74%
Mid Coverage
52–77 keys
25–49%
Low Coverage
26–51 keys
<25%
⏰ Just Started
Under 26 keys
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What This Tests

Every keydown event sent by your OS is shown on the virtual layout. If a key produces no event, the switch may be broken or the key may be blocked by the OS or browser.

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N-Key Rollover

Hold multiple keys simultaneously and verify all of them light up. Budget keyboards may miss keys when 3 or more are held — known as ghosting. Gaming keyboards support full NKRO.

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Key Chatter

A key with a count badge showing 2+ from a single press has a chattering switch — it fires multiple signals per physical actuation. Common on worn mechanical switches.

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Blocked Keys

Some keys may not register: PrintScreen, ScrollLock, and media keys are sometimes intercepted by the OS before reaching the browser. This is normal behaviour.

Keyboard Size

Or pick by the common percent-size naming.

Frequently Asked Questions

Press Start Test, then press any key on your keyboard. Each key lights up orange on the virtual keyboard when it registers a keydown event. If a key never lights up after pressing it, the switch may be broken or the OS is intercepting the signal.
Some keys (PrintScreen, ScrollLock, certain media keys) are blocked by the OS or browser and will never fire a keydown event. For other keys, if pressing produces no response, the switch is likely failed or the keycap is stuck.
N-key rollover means every key is scanned independently so any number of simultaneous keypresses all register correctly. Hold several keys at once and watch the keyboard — with full NKRO all keys light up simultaneously.
Ghosting occurs when pressing a combination of keys causes a phantom keypress on a key you never touched, or causes a real keypress to be dropped. It happens on keyboards with simple key matrices that cannot handle certain key combinations.
Yes. A small count badge appears on each key showing total presses. If a single physical press shows a count of 2 or more, the switch is chattering — firing multiple keydown events per actuation. This is a sign of a worn mechanical switch.

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F1 Reaction
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