How do I use the keyboard tester?

Simply click on the keyboard tester page and press any key on your physical keyboard. The corresponding key will highlight on the on-screen keyboard map, and the event.code and event.key values will be displayed for that key press.

What does event.code and event.key mean?

event.code is a physical key identifier (e.g., 'KeyA' for the A key) that doesn't change based on layout or modifiers. event.key is the character or function the key produces (e.g., 'a', 'A', 'Enter'). This helps identify which physical key is pressed and what input it generates.

Can this tester detect stuck or dead keys?

Yes, by pressing each key and observing if it highlights on the map. If a key doesn't highlight when pressed, it may be dead. If a key stays highlighted without being pressed, it may be stuck. The tester helps you identify such issues.

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Sofort, privat und kostenlos

Tastatur-Tester.

Überprüfen Sie jede Taste auf Ihrer Tastatur. Drücken Sie eine Taste und sehen Sie sie auf der Karte aufleuchten, mit ihrem event.code und event.key.

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Starten Sie den Test und drücken Sie dann jede Taste, die Sie überprüfen möchten.

Esc

F10

F11

F12

Backspace

Tab

[

]

Caps

;

Enter

Shift

Ctrl

Erkannte Tasten

Noch keine Tasten aufgezeichnet.

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Cite this calculator

Canonical URL: https://mathify.one/de/random/keyboard-test

Cite as: Mathify. (n.d.). Tastatur-Tester. https://mathify.one/de/random/keyboard-test

Use Cases

Diagnose keyboard issues

Use the tester to check if all keys are working properly. Press each key and see if it registers on the map. This helps identify dead or stuck keys before replacing the keyboard.

Example: Press every key one by one to ensure each highlights correctly.

Learn key codes for development

Developers can use the tester to see the exact event.code and event.key values for each key, which is useful when implementing keyboard shortcuts or handling input events.

Example: Press 'Shift' to see event.code 'ShiftLeft' and event.key 'Shift'.

Frequently Asked Questions

How do I use the keyboard tester?: Simply click on the keyboard tester page and press any key on your physical keyboard. The corresponding key will highlight on the on-screen keyboard map, and the event.code and event.key values will be displayed for that key press.
What does event.code and event.key mean?: event.code is a physical key identifier (e.g., 'KeyA' for the A key) that doesn't change based on layout or modifiers. event.key is the character or function the key produces (e.g., 'a', 'A', 'Enter'). This helps identify which physical key is pressed and what input it generates.
Can this tester detect stuck or dead keys?: Yes, by pressing each key and observing if it highlights on the map. If a key doesn't highlight when pressed, it may be dead. If a key stays highlighted without being pressed, it may be stuck. The tester helps you identify such issues.

Tips & Common Mistakes

Tips

Test all keys, including modifiers like Shift, Ctrl, and Alt, to ensure they register correctly.
Use the tester in a well-lit environment to see the on-screen keyboard clearly.
If a key doesn't highlight, try pressing it firmly or check for debris under the key.
Compare the event.code and event.key values to understand how your keyboard layout affects input.

Common Mistakes to Avoid

Pressing keys too quickly without observing the highlight, missing a dead key.
Assuming a key is stuck when it's actually the OS repeating the key due to holding it down.
Not testing all keys, especially less-used ones like F-keys or Print Screen.

Last updated: August 13, 2026