Keyboard and mouse tester

Shows which keys, mouse buttons and wheel movements are detected as you use them. It also counts auto-repeat from held keys and clicks that come unusually close together.

Only key names, counts and click intervals are counted, on this page. The characters you type are not recorded. Nothing is saved or sent.

Press “Start test” to check keys and mouse here.

Keyboard

Key presses: 0
Auto-repeats: 0
Different keys: 0

Keys held downNone

Highlighted keys have responded at least once. Keys you are holding are filled in.

Keys pressed (0 keys)

No keys pressed yet.

Mouse and touch

Button	Presses	Shortest interval	Fast repeats
Left	0	—	0
Middle (wheel)	0	—	0
Right	0	—	0
Back	0	—	0
Forward	0	—	0
Touch	0	—	0

Clicks: 0
Double-clicks (as detected by the browser): 0
Clicks with other buttons: 0
Right-click menus: 0

Wheel

Up: 0
Down: 0
Left: 0
Right: 0

Recent intervals (time between two presses of the same button)

Press the same button twice or more to see intervals here.

A fast repeat means the same button was pressed twice within the threshold. A quick double-click also counts. The count alone cannot tell you whether a device is faulty.

How it measures

Press “Start test” to move focus to the test area. Keys and mouse events are counted only while the test area has focus. Clicking elsewhere or switching tabs pauses the test, and any keys still held are treated as released (the page cannot tell when they are let go).
Keys are counted by physical position (code). Presses and auto-repeats from a held key (repeat) are counted separately. You can show the keyboard as a US or JIS layout; the page language does not decide this.
For the mouse, the interval (in milliseconds) between two presses of the same button is measured. Intervals shorter than the threshold you choose are counted as fast repeats. A quick double-click also counts.
Touch input is counted separately from mouse buttons.

What cannot be detected

Keys used first by the browser or operating system (Ctrl+W, F5, Windows key shortcuts, volume keys and so on) may never reach the page or cannot be blocked. A key that does not show up is not necessarily broken.
While testing, the page only blocks the default action of keys that would scroll (Space, arrow keys, Page Up/Down, Home, End) and of / and ', which open Firefox’s quick find. Tab is not blocked by default (it moves focus out of the test area). If you choose “Also test the Tab key”, Tab is counted too, and Esc leaves the test area.
On phones, the on-screen keyboard does not appear. You can test an external keyboard or mouse.
Some browsers reduce timer precision (for example in privacy modes), so intervals may be rounded to 1 ms or 100 ms.

Reading the results

Fast repeats or auto-repeat counts alone cannot prove that a keyboard or mouse is faulty. Repeat the same action several times and compare with another computer or browser.

What is not recorded

Only key names and counts are kept, on this page. The order of presses is not kept, so the text you typed cannot be reconstructed. Results are not saved or sent. Only the keyboard layout and threshold settings are saved.

This tool processes your input and files on this device (in your browser) and does not send them to a server. See Privacy and ads for details.