Keyboard Tester
Press every key. Keys that reach your browser light up, so a dead key is easy to spot.
This test needs a physical keyboard connected to this device.
Press any key
Each key lights up when your browser receives it.
Keys are captured while you test. Press Esc twice to release Tab and shortcuts.
- Keys seen
- Most keys held at once
- press several together
- Double-typing
- tap one key many times
- Held down now
- none
Details and settings
- Character or name (key)
- ·
- Position name (code)
- ·
- Keys not on this layout
- none
Key legends follow the US layout. Positions are what count.
Recent presses
How to test
- Pick the layout that looks like your keyboard.
- Press each key once. Pressed keys stay tinted.
- Hold several keys together to see how many register at once.
- Tap one key many times to look for double-typing.
What the results mean
A key that never lights up did not reach the browser. Try it in another app before you blame the keyboard, because some keys (for example some Fn combinations and system shortcuts) are handled by the system and may never arrive on a web page.
How double-typing is judged
If the same key is pressed again within 30 ms of being released, this site counts it as possible double-typing (often called chattering). 30 ms is this site’s own rule, not an official standard. You can change it under Details and settings.
Keys held at once
Hold keys down together and the tester shows the largest number it saw at the same moment. If a key stops registering once others are held, your keyboard limits that combination.
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Questions
Why does a key not light up?
Either the keyboard did not send it, or the system kept it. Media keys, the Fn key on many laptops and some system shortcuts may not reach a web page. Test the key in a text editor as well.
Does this keyboard tester record what I type?
No. Key presses are counted inside this page and are gone when you close or reload it. The only things saved on your device are the layout you picked and the double-typing setting.
Which layout should I choose?
ANSI 104 is the common full-size layout with a wide Enter key. ISO 105 has a tall Enter key and one extra key next to the left Shift. Tenkeyless 87 has no number pad. Mac matches Apple keyboards.
Guides
- Keyboard typing double letters: how to confirm chatteringOne press, two letters? Confirm double-typing (chattering) on a single key with the keyboard tester, see how the 30 ms rule decides, and rule out other causes.
- Key rollover and ghosting: test how many keys register at onceHold keys together and see how many your keyboard really reports. A practical way to test key rollover and spot ghosting or blocked combinations.
Other tests
- Mouse TestButtons, wheel, double-click fault, report rate
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- Webcam TestLive picture, size, frames per second, photo
- Speaker Test (Left / Right)Left, right, both, rising tone
- Dead Pixel TestFull-screen black, white, red, green, blue
- Refresh Rate TestScreen Hz and a moving bar
- Gamepad TesterButtons, sticks, triggers, drift, vibration
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