offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers
Keyboard Rollover Tester
Check how many keys your keyboard can register simultaneously and monitor live key states.
Free to use, no watermarks, runs in your browser—nothing uploads to our servers
Press and hold any combination of keys. Release everything and press again to reset the current list.
Currently pressed
None
Max simultaneous keys
0
Recent key presses
No key activity yet.
Report a bug
If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.