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Keyboard Tester

Test keyboard input, key chatter, simultaneous key presses, and Caps Lock entirely in your browser.

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This tool only displays input events within the browser. There is no function to send or save key input contents or detection results to the server.

Flag repeated input within this many milliseconds as possible chatter
Currently pressed 0 key
Maximum simultaneous keys 0 key
CapsLock Not detected
Suspected chatter events 0 items

Connected keyboard information

Display only devices authorized by WebHID in your browser. No server transmission or external dictionary inquiries are performed.

Not retrieved yet. Previously authorized HID devices will appear automatically.

Pressed down Pressed Suspected chatter events

Simultaneous press detection

Not detected yet.

Suspected Chattering Log

Not detected yet.

About this tool

You can visually check if each key on your keyboard is responding correctly, and if there are any repeated or simultaneous presses for a short period of time.

Features

  • 100%, 75%, 60% keyboard with JIS/English layout
  • Detection of press history, simultaneous presses, CapsLock, and suspected chattering

How to use

  1. Select the layout and keyboard size you are using.
  2. Press the actual keyboard and see the reaction on the screen.
  3. Check the history of suspected chattering and simultaneous pressing.

Limitations

  • Some key combinations reserved by the browser or operating system may not be detected.
  • WebHID device information is acquired only when the user allows it with a compatible browser.

Related tools

Guides and troubleshooting

Privacy: Key detection runs in the browser. Input history is neither sent to nor stored on the Develop Tools server, and WebHID information is accessed only after the user grants permission.