Keyboard tester
Press and release keys to see them on the keyboard diagram. Hold keys together to check a combination, or choose a test below for counts, timing and characters.
What the test received
Press and release a key to begin.
A key does not appear on the board
A checkmark means this page received a press and release. An unmarked key has not completed that cycle here. Orange lock dots show reported On states; a dash in Key states means unknown.
Confirm the test has focus
Click the board, press an ordinary letter, then press and release the affected key. Select the size and physical shape that include that position.
Check what the key actually does
Try it in another app. Print Screen may open a screenshot tool instead of reaching this page. For Fn layers or Windows/Mac modes, check your exact keyboard manual.
Review unexpected input filters
Check Filter Keys on Windows, or Slow Keys and Mouse Keys on Mac. Preserve settings you rely on; change only an unintended option and restore it after comparison.
Compare the connection
Try a direct USB port and check wireless charge. Retest on another computer if available. For an obstructed key, follow your model’s unplugged cleaning instructions.
Retest
Reset the board and repeat the same press and release. If it works in another app but not here, investigate focus or shortcut handling first.
If it persists
If the same key also fails in other apps or on another computer, contact the manufacturer with the key, model and connection details.
NEED A FOCUSED CHECK?
Investigate a specific symptom.
For repeated characters, interrupted holds, missed combinations, repeat pace or layout questions, choose a dedicated test.