How to use the Online Keyboard Test
Focus the keyboard board and press each key once, then test combinations that matter to your workflow. Note the displayed key value and physical code for unusual layouts. Finish with suspected keys on a second browser or device so software focus problems are not mistaken for hardware faults.
How to interpret your result
A highlighted key confirms that a keyboard event reached the page. The code identifies the physical position while the key value reflects the active layout. Rollover checks show whether simultaneous events arrive together, but they do not prove that every switch is electrically perfect.
Important limitations
Operating-system shortcuts, media controls, power keys, and vendor firmware may never be exposed to a webpage. Compact boards and international layouts may not match the visual drawing. A browser test cannot measure switch force, chatter outside the captured events, or wireless radio quality.
Troubleshooting checklist
Reconnect the keyboard directly, remove hubs, and try another USB port. Check the operating-system layout and browser focus, then compare with an independent keyboard tester or text field. If one application fails while this page works, investigate that application before replacing hardware.
Practical use cases
Use the page after building a keyboard, buying a used board, or changing layouts. Support teams can ask users for a key code when diagnosing a remote issue. Gamers can verify rollover for a specific movement combination before changing firmware or remapping controls.
Try the live tool
Frequently asked questions
Why are media keys missing?
Many media and power keys are intercepted by the operating system and are not delivered to normal web pages.
Can this test prove a keyboard is broken?
It can confirm missed browser events, but a complete diagnosis also needs another port, application, and sometimes a second device.