Keyboard Tester
Press every key and see which ones work, plus key codes and rollover.
Click the keyboard below (or press Start), then press keys.
How to use Keyboard Tester
- Click the on-screen keyboard (or press Start testing keys) so the page receives your key presses.
- Press each key. Keys that work turn green; keys you are holding light up. The panel shows the key, its code and its location.
- To test rollover (anti-ghosting), hold several keys at once, for example A S D F J K L: the counter shows the most keys registered together. Press Esc twice quickly to stop.
How to read the results
Each physical key has a code (such as KeyA or ShiftLeft) that does not depend on your language layout, and a key value that does (A, Q or Ä on the same physical key). The tester lights keys by code, so it works with any layout; the on-screen keyboard is drawn as a full-size US/ANSI board, and keys missing on your keyboard can simply be ignored.
Rollover is the number of keys a keyboard registers at the same time. Many office and laptop keyboards manage 2–6 keys in some combinations; gaming keyboards often claim “N-key rollover” (all keys). When a keyboard cannot register a combination, a key is missed (blocking) or a wrong one appears (ghosting). Hold combinations you use in games to test them.
Some keys never reach a web page because the operating system takes them first: Fn, Print Screen on some systems, the Windows key combinations, and media keys. A key that stays grey may be fine; check it in a text editor too.
Example
Holding W, A, Shift and Space on a laptop keyboard shows “most keys held at once: 3” — one key was blocked, a common limit of laptop keyboards. A mechanical keyboard with NKRO shows all 4.
Frequently asked questions
How do I test my keyboard?
Click the keyboard picture and press each key. Working keys turn green. Keys that stay grey when pressed did not reach the browser.
How do I test keyboard ghosting or rollover?
Hold several keys together, for example W, A, S, D and Space. The counter shows the largest number registered at once; if a held key does not light up, your keyboard does not support that combination.
Why does a key not light up?
Either the key is faulty or the system intercepts it before the browser (Fn, some Print Screen and Windows-key shortcuts, media keys). Try the key in a text editor. Laptop function keys may need Fn held.
Does it work with non-English keyboards?
Yes. Keys are matched by physical position, so AZERTY, QWERTZ and other layouts light the corresponding key on the picture, and the panel shows the character your layout produces.
Is what I type recorded?
No. Key presses are only shown on this page; nothing is stored or sent.
Limitations
- The picture is a full-size ANSI layout; ISO and compact keyboards have a few different keys.
- Keys intercepted by the operating system cannot be tested in a browser.
- Rollover depends on which keys are combined; test the combinations you care about.
Guides for this tool
- What Is a Good Typing Speed? Average WPM by the NumbersThe average typist manages about 52 words per minute, according to a study of 168,000 people. How WPM is measured, what counts as fast, and how to improve.
- Dead Pixel vs Stuck Pixel: Check a Screen in 2 MinutesHow to spot dead and stuck pixels, backlight bleed and a wrong refresh rate on a new or used monitor, laptop or phone, and what you can do about each.
Last reviewed November 9, 2026. How we build and test tools.