Current rollover result
Hold multiple keys and watch the current pressed key count and maximum simultaneous key value update.
Local testing only Start testing
Check simultaneous key detection.
N-Key Rollover Test
Use this N-key rollover test to see how many simultaneous keys your browser can detect from your keyboard.
Treat the result as a browser-based practical check, not a certified NKRO hardware measurement.
Start testingRollover capacity check
Rollover capacity check
Run the N-Key Rollover Test
Shows current and maximum simultaneous pressed keysUseful for 2KRO, 6KRO, and NKRO spot checksComplements the ghosting test
Inspection flow
Inspection flow
1. Full key pass
0/104Press every key in the selected layout until the progress reaches 100%.
2. Ghosting combos
0/4Hold each listed combo and confirm all keys appear together.
3. Chatter 10-tap check
0/10Tap Press a key ten times with normal pressure, then review possible chatter.
W + A + Shift + SpaceW + D + Shift + SpaceQ + W + E + RA + S + D + F
Live status
Test stats
0Tested keys
104Untested keys
0Pressed now
0Max simultaneous
0Possible issues
- Last key
- None
- Currently pressed
- None
Ghosting test
Rollover check
- Current pressed keys
- None
- Max simultaneous keys detected
- 0
Try common gaming combinations to check for possible ghosting.
W + A + Shift + SpaceW + D + Shift + SpaceCtrl + Shift + EscQ + W + E + RA + S + D + F
Diagnostics
Possible issues
- Possible chatter
- None detected
- Possible stuck keys
- None detected
These are browser-based estimates. Retest a suspicious key several times before treating it as a hardware fault.
Local report
Export results
Keyboard Tester Online Report ============================= Generated at: 2026-05-15T07:32:42.416Z Selected layout: Windows Full-size Browser / OS: Unknown browser on Win32 Tested keys: 0/104 Untested keys: 104 Untested key list: Esc, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, PrtSc, ScrLk, Pause, `, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, -, =, Backspace, Ins, Home, PgUp, Num, /, *, -, Tab, Q, W, and 64 more Max simultaneous keys detected: 0 Possible stuck keys: None Possible chatter keys: None Pass / fail checklist --------------------- All layout keys tested: CHECK No possible stuck keys: PASS No possible chatter keys: PASS Multi-key input detected: CHECK Issue summary: 104 layout keys were not tested; multi-key rollover was not meaningfully tested Notes: Browser-based estimate. Some hardware keys, Fn keys, media keys, and system shortcuts may not be detectable.
ChecklistAll keys: CHECKStuck keys: PASSChatter: PASS
How to run an N-key rollover test
Start with three keys, then add more keys one at a time while checking whether every key still appears.
2KRO, 6KRO, and NKRO explained
2KRO keyboards detect two keys reliably, 6KRO keyboards detect six, and NKRO keyboards aim to detect many keys at once.
Rollover limits in browser tests
Operating systems, browsers, and system shortcuts can affect what this page receives from the keyboard.
Related ghosting test
Use the ghosting page to test specific game or shortcut combinations after checking maximum simultaneous input.
Help
Can this confirm true NKRO?
It can show what your browser detects in practice, but it cannot certify a keyboard's hardware rollover rating.
Why do some shortcuts stop the test?
System-level shortcuts can be intercepted before the browser receives those key events.