The keyboard tester lets you confirm every key press in real time. Use a consistent checklist so you can isolate the problem fast instead of guessing.
1. Match the layout and connection
Choose the layout that matches your physical keyboard. If you are on a wireless board, verify the receiver or Bluetooth connection first.
- Pick the correct layout (QWERTY, AZERTY, QWERTZ, and so on).
- Unplug and reconnect if the board is not fully recognized.
- Avoid hubs if the keyboard is dropping inputs.
2. Run a baseline pass
Press every key once from left to right. Missing highlights can signal a stuck switch or a layout mismatch.
3. Test rollover and ghosting
Hold two or three keys and press a fourth. If the tester stops registering, your keyboard may have a rollover limit.
4. Check modifiers and layers
Press Shift, Ctrl, and Alt with regular keys. If modifiers fail, test on another browser or confirm no remapping is active.
Some Fn layers are handled in hardware and will not show in the tester, so focus on standard modifiers and alphanumeric keys.
5. Rule out software issues
Open the tester in another browser or a private window. If the problem disappears, it may be caused by extensions or input remapping software.
- Disable key remaps or macro tools temporarily.
- Check OS-level accessibility settings.
- Test the same key on a second device if possible.
6. Document and decide next steps
Take a screenshot, clean the keyboard, and retest. If the same key fails again, it is likely hardware related.
Fast checklist
- Match the layout first
- Press every key once
- Test 3-4 key combos
- Check modifiers
- Retest after cleaning
Next steps
If the issue repeats, test on a second device or replace the switch.
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