Free Online Keyboard Tester

1. Click anywhere on the page, then press any key.
2. Watch the visual layout — pressed keys highlight.
3. Read the live event.key, event.code, event.keyCode and location values.
4. Use Reset to clear the highlights between tests.

Keyboard testers are useful for two things: spotting a dead or sticky key on a physical keyboard, and figuring out the exact event values your code will receive when a user presses a key. JavaScript exposes three (and a half) different identifiers — key is the logical character, code is the physical position, keyCode is the deprecated numeric value, and location distinguishes left versus right modifier keys.

IT support uses it to confirm a hardware fault before approving a replacement. Software developers verify how their keydown handler will see modifier combinations across operating systems. Mechanical-keyboard hobbyists test newly built boards before declaring them ready. The tool maps every keydown to its KeyboardEvent.code and lights up the corresponding cell in a US-layout grid. Hold a key to see auto-repeat in action; press modifier keys to see left/right location values change.

Nothing is logged or sent anywhere. Reset clears highlights between tests.