Keyboard Tester | How to use and interpret results
Observe keyboard events reaching the browser, including the last key and Caps Lock state. This visual check is not an electrical diagnosis of keyboard hardware.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Loading the tool. If it does not appear, reload this page.
How to use this tool
Focus the test area and press and release the keys to inspect. Operating-system or browser shortcuts may be intercepted before the page receives them.
Results and examples
Pressing A can show a or A in the last-key and text display. If a drawn key does not light up, first consider differences between its label and event code mapping.
Worked example
Pressing A can show a or A in the last-key and text display. If a drawn key does not light up, first consider differences between its label and event code mapping.
Limitations
- Special keys, regional layouts and IME input may not match every drawn key.
- The activity cannot conclusively diagnose contact faults or rollover limits.
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
What is displayed when I press A?
Pressing A can show a or A in the last-key and text display. If a drawn key does not light up, first consider differences between its label and event code mapping.
Does an unlit key prove a fault?
Special keys, regional layouts and IME input may not match every drawn key. The activity cannot conclusively diagnose contact faults or rollover limits.
