Free keyboard diagnostic

Keyboard Tester Online

Press keys on your physical keyboard and watch them light up below. Use it to check letters, number keys, modifiers, arrows, function keys, punctuation and the numpad.

Live test

Press any keyboard key

Keys turn blue while held and remain marked after they have been tested.

Last key—

Code—

Location—

Keys tested0

Some browser or operating-system shortcuts can be intercepted before a webpage receives them. If a special key does not register here, that alone does not prove the key is defective.

What this tool checks

Test common keyboard keys in seconds

Letters and number row

Check A–Z, 0–9, punctuation, Backspace, Tab, Caps Lock, Enter and Space.

Left and right modifiers

The tester distinguishes left/right Shift, Control and Alt when the browser exposes the key location.

Function and navigation keys

Check F1–F12, Insert, Delete, Home, End, Page Up, Page Down and arrow keys.

Numpad

Test Num Lock, digits, decimal, Enter and calculator operators on a full-size keyboard or external keypad.

Useful before typing practice

When should you use a keyboard tester?

A keyboard tester is useful when a key feels inconsistent, repeats unexpectedly, stops responding, or behaves differently after cleaning, travel, a spill, a keyboard replacement, or connecting a USB/Bluetooth keyboard. It is also a quick way to verify left/right modifier keys and numpad input before a typing test.

For typing practice, a reliable keyboard matters more than an expensive one. If every key registers consistently and the keyboard feels comfortable, you can learn touch typing on it. If you are choosing a new keyboard, read our guide to choosing a comfortable keyboard for typing practice.