Keyboard test
Press keys to check that each one works. Supports Windows and Mac layouts and shows how many keys you hold at once and their key codes. Nothing is sent to the server.
Pressed keys are only shown on this page in your browser and are never sent or stored. Still, do not type passwords or other sensitive text here.
Press any key. It lights up on the keyboard below.
Held now Already pressed Not pressed yet
Keys held now
0
Most keys held at once
0
Try pressing many keys together. Ordinary keyboards often stop registering around 6.
Keys tested
Keys not pressed yet (if one does nothing when pressed, it may be faulty)
Keys not on the layout (IME, media keys, etc.)
Recent events
Combinations the browser or OS takes first (Ctrl+W, Alt+F4, Cmd+Q), the laptop Fn key and some media keys cannot be received by a web page. On some systems PrtSc is only seen on release.
FAQ
- If a key shows nothing, is it broken?
- First check whether the same key works in another app (a text editor). If it fails everywhere, the switch or contact under the keycap is likely faulty. Laptop Fn combinations may not be visible to the web.
- Some keys do not light up when I press many at once.
- That is a limit of the keyboard circuit (ghosting / rollover). Office keyboards usually handle about 6 keys; gaming keyboards offer N-key rollover. Use "Most keys held at once" to measure yours.
- Does it work while typing in Korean?
- Yes. Keys are matched by physical position (code), not by the character, so the same key lights up whatever the input language.
- On Mac, other keys look released when I hold Cmd.
- Mac browsers often send no key-up for other keys while Cmd is held, so this tool clears the held state when you release Cmd.
How to use this tool
Use it to check that a keyboard works. Press keys to see whether they register, along with how many keys are down at once and the key codes. Windows and Mac layouts are supported and input is not sent to a server.
Frequently asked questions
What can I check?
Whether keys register when pressed, how many keys are held at once, and the key codes.
Does it support Mac keyboards?
Yes. Windows and Mac layouts are supported.
Are my key presses recorded?
No. Input is not sent to a server.
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