Keyboard Key & Rollover Tester

Why Test Keyboard Keys & Anti-Ghosting Online?

Whether assembling a custom mechanical keyboard or inspecting for spilled liquid damage, mechanical switches can develop key chatter (double-typing) or dead contacts. Gaming and complex hotkey workflows also require N-Key Rollover (NKRO) without ghosting.

Key Metrics and Testing Tips

• 全键无冲突 (NKRO)：Press multiple keys simultaneously. Standard membrane keyboards lock up after 3–6 keys; full NKRO mechanical boards register unlimited concurrent keys.
• 连击排查 (Key Chatter)：Tap a switch once. If the event counts rapidly register multiple strikes, the mechanical contact leaf is chattering.
• event.code 与 event.key 区别：event.code reflects physical switch location regardless of keyboard layout; event.key reflects the produced character.