Mechanical Keyboard Tester.
Test every switch, catch chatter and stuck keys, and confirm N-key rollover on your mechanical keyboard — right in the browser. Nothing is installed or uploaded
What to check on a mechanical keyboard
- Every switch actuatesPress each key once and watch it light up on the board above. A key that stays dark has a dead or unseated switch — common after a hot-swap or a spill.
- Key chatter (double-typing)Tap a key slowly and deliberately. If a single press registers twice, the switch is chattering. Confirm it in the key event logger, which timestamps every keydown.
- N-key rolloverHold several keys at once. The anti-ghosting / NKRO test shows whether your board registers every simultaneous press or drops keys (ghosting).
- Stabilizers on the big keysPress Space, Enter, Backspace and both Shifts at each corner. Rattle, a mushy return, or an uneven feel points to loose or dry stabilizers rather than a bad switch.
- Keycodes match the legendsEach key shows its raw
event.code, so you can confirm a remapped layer, a hot-swapped switch, or a foreign layout reports exactly the key you pressed.
Why a mechanical keyboard needs its own test
Mechanical keyboards use an individual spring-loaded switch under every keycap instead of a single rubber membrane. That makes them repairable and satisfying to type on — but it also means faults are per-switch: one key can chatter, stick, or die while the other 100 feel perfect. A quick visual test catches exactly which switch is at fault.
Run the online keyboard tester above and press every key methodically, row by row. Each key you press lights up and logs its keycode. Then stress the things a membrane board never has to worry about: simultaneous presses (rollover), rapid repeats (chatter), and the stabilized keys.
Testing after a hot-swap, lube, or new switches
Whenever you swap switches, lube stabilizers, or reflash firmware, retest before you trust the board:
1. Seat check. Press every changed key — a switch with a bent pin won't register at all and will stay dark above.
2. Chatter check. Slowly tap each new switch 10–15 times and watch the event logger for doubled keydowns.
3. Rollover check. Hold a handful of keys together on the NKRO test to confirm the matrix still reads them all.
4. Feel check. Run a quick typing test — chatter and scratchy stabilizers show up fast in real words.
Frequently asked questions
How do I test a mechanical keyboard?
Open the keyboard tester above and press every key once — each one lights up and shows its keycode, so any key that stays dark is dead. Then hold several keys together to check rollover, and tap keys quickly to check for chatter. It all runs in the browser with nothing to install.
What is keyboard chatter and how do I detect it?
Chatter is when a single keypress registers two or more times because the switch bounces. To detect it, tap a key slowly and deliberately while watching the key event logger — if one press produces two keydown events, that switch is chattering and usually needs cleaning or replacing.
How do I test N-key rollover (NKRO)?
Hold down as many keys as you can at the same time on the anti-ghosting test. A board with full NKRO registers every key; one limited to 6KRO stops lighting up new keys after six. Ghosting is when keys you never pressed appear.
Can I test a mechanical keyboard without downloading software?
Yes. This tester runs entirely in your web browser — no download, no install, and nothing is uploaded. Your keypresses are read locally by the page and never leave your device.
Does it work for hot-swappable keyboards?
Yes. After swapping a switch, press that key on the tester to confirm it seats and registers, then tap it repeatedly to rule out chatter. The keycode display also confirms the key maps where you expect.