Focus the test area, then press keys. Tab can always move focus away.
Some Fn, media and system shortcuts are handled by hardware or the operating system and may not reach this page. The diagram uses a US-style layout; reported key values follow your active layout.
See keyboard events received by the browser, a recent key history and the highest number of keys held together. The diagram is a US-style reference; typed characters and event codes are shown separately.
How to use this tool
Click or tab into the keyboard area, then press each key and try combinations. A highlighted key is held; green shows a previously tested key. Reset clears the counters. Tab moves focus out of the test area.
What this test can and cannot show
The browser may never receive system shortcuts, Fn keys or some media keys. An absent event alone does not prove a broken key. The simultaneous count describes events observed here, not a certified keyboard rollover rating. No key history is uploaded by this tool.
Updated October 1, 2026. Browser and device support varies.
Questions and troubleshooting
Why do the diagram letters differ from my keyboard?
The diagram shows a US-style physical layout. The last-key value follows your active layout, while the event code identifies a key position. For example, an AZERTY character can appear over a different letter in the diagram.
Does an unlit key or missing combination prove a fault?
No. Focus the test area and retry individual keys first. The operating system can intercept shortcuts, Fn and media keys. The simultaneous count only includes events received by this page; it is not a certified rollover rating.
How this tool was checked
Automated Chromium checks on October 1, 2026 covered quote and Unicode key events, counters, reset and leaving with Tab in all six versions. This was browser-event testing, not certification of a physical keyboard.
Technical references: MDN: KeyboardEvent.code