NKRO Keyboard Test
Observe simultaneous keys and the maximum combination your browser receives.
Simultaneous key observation
This reports the maximum delivered to the browser—not a claim of full N-key rollover.
Activate the test to begin.
Recent combinations
No multi-key combinations observed yet.
What this page helps you test
This focused browser tool also answers searches such as: what is nkro keyboard · nkro keyboard tester · how to know if keyboard is locked.
Guides for this tool
See how this check fits into real troubleshooting workflows.
If the result is not what you expected
Keep focus in the test
Input tests capture events only inside the clearly marked active area.
Try a direct port
Reconnect wired devices without a hub and retest the same control.
Compare another app
OS shortcuts and browser event filtering can hide otherwise working controls.
How it works
- Activate the test zone, then hold several keys at the same time.
- Watch the current pressed set and maximum observed count.
- Release all keys or leave the test to safely reset the pressed state.
What this result cannot prove
- This cannot prove full N-key rollover because the OS and browser may filter combinations.
- Firmware, connection type, and platform behavior can all affect observed results.
Related tools
Frequently asked questions
Is the NKRO Keyboard Test private?
Yes. Test input is processed in this tab and is not uploaded by this tool.
Why can browser results differ from another app?
Browsers, operating systems, permissions, device routing, and background load can all change what is exposed and measured.