Keyboard testing guides.
Step-by-step help for the most common keyboard problems — each guide pairs a plain-English explanation with a free, no-install browser tool so you can test as you read.
Keyboard keys not working? How to test and fix them
Diagnose dead, stuck, or dropped keys — from a quick online key test to fixing switches.
Read the guideLaptop keyboard not working? How to fix it
Isolate software from hardware, fix drivers and accessibility settings on Windows and macOS, and know when it’s a repair.
Read the guideKeyboard typing the wrong letters or symbols?
Why the wrong character types (it’s almost always a layout setting) and how to fix it on Windows and macOS.
Read the guideKeyboard typing numbers instead of letters?
U becomes 7, J becomes 1 — it’s almost always Num Lock and a hidden keypad. The fix for Windows and Mac.
Read the guideKeyboard double typing (key chatter)?
Confirm it with a key event logger, then fix it — cleaning, debounce settings, or a switch swap.
Read the guideFunction keys (Fn / F1–F12) not working?
Fix the Fn Lock toggle, BIOS setting, and dead-key checks so F1–F12 do what you expect.
Read the guideCaps Lock stuck or typing in all caps?
Tell a stuck Caps Lock key from a held-down Shift key, and fix both on Windows and macOS.
Read the guideSpacebar not working or mushy?
Debris, a bent stabilizer, or a worn switch — diagnose and fix a dead or mushy spacebar step by step.
Read the guideWireless or Bluetooth keyboard not connecting?
Work through pairing mode, re-pairing, dongle checks, and driver resets in the right order.
Read the guideKeyboard input lag and typing delay
Find the real source of lag — Filter Keys, wireless latency, polling rate, or background CPU load.
Read the guideHow to clean a keyboard: crumbs, sticky keys & spills
Clean crumbs and dust, pull keycaps safely, and what to do in the first 60 seconds after a spill.
Read the guideWhat is keyboard ghosting and NKRO?
Ghosting, jamming, rollover, 6KRO and NKRO explained — plus how to test your board’s limit.
Read the guideHow to test a mechanical keyboard
A complete checklist: every key, rollover, polling rate, chatter, and typing feel.
Read the guideKeyboard polling rate explained
What Hz actually means, the millisecond math behind 125–8000Hz, and whether higher numbers are worth it.
Read the guide