Why browser MIDI testing does not work in Safari

You open a MIDI test in Safari, press a key on your controller, and nothing happens. That does not necessarily mean the keyboard is broken. Safari does not support the browser MIDI access the test needs, so it cannot receive MIDI messages from your device.

Use a browser that supports MIDI access to check the controller. The MIDI Test can show whether keys, knobs, pedals, and other controls send messages to your computer.

Test your MIDI controller in a supported browser

1. Open the MIDI Test in Chrome or Edge on your computer. If you opened it in Safari, switch browsers rather than changing Safari settings.
2. Connect your MIDI keyboard or controller to the computer. Turn it on if it has a power switch, and connect any MIDI interface it needs.
3. If the browser asks to access MIDI devices, allow access. If the test offers a list of devices, select the controller you want to check.
4. Press and release a key, then try a knob or pedal. Look for incoming MIDI messages or changes in the test as you operate each control.

Connect the device before opening the test if possible. If you connect it afterward, reload the page so the browser can look for it again.

What the result means

No device appears in Safari

This is expected. Safari does not provide the MIDI access needed by the browser test. Changing a site permission, restarting Safari, or reconnecting the controller will not add that support. Open the test in Chrome or Edge instead.

The browser sees the controller and messages change

The controller is sending MIDI data, and the browser is receiving it. A MIDI message is a digital instruction, such as a key being pressed or a knob being moved. This confirms that the tested control and connection are working, though it does not check whether an instrument or music app plays sound.

The controller is listed, but no messages appear

The browser may have access to the device, but the controller is not sending input. Check that you selected the right device, that it is powered, and that you are pressing a control that sends data. Some devices have separate MIDI input and output ports, so make sure the connection goes from the controller's MIDI output to the computer or interface's MIDI input.

No controller appears in Chrome or Edge

This points to a connection, permission, or device issue rather than Safari's limitation. Check that the computer recognizes the controller, then reconnect it and reload the test.

How to fix MIDI access or connection problems

1. Switch away from Safari. Open the test in Chrome or Edge. Safari cannot be made compatible with this test by clearing its cache or changing its privacy settings.
2. Allow the browser to access MIDI devices. If a permission request appears, allow it. If you dismissed it, use the browser's site controls beside the address bar to review the site's permissions, then reload the page. The wording and available controls can differ by browser version.
3. Check the cable and power. Try a direct USB connection instead of a hub, use another USB port, and check the controller's power light. For a Bluetooth controller, make sure it is paired and connected. In Windows 11, check Settings › Bluetooth & devices › Devices. On a Mac, check System Settings › Bluetooth.
4. Check whether the computer recognizes the device. On a Mac, open Audio MIDI Setup and look for the controller in the MIDI configuration window. For a USB controller, try a different cable or port. If the computer does not detect it, the browser will not be able to test it either.
5. Reconnect the controller and reload the page. Close the test, unplug the controller, reconnect it, wait a few seconds, and reopen the page in Chrome or Edge. If another music program is open, close it temporarily and test again.
6. Check the controller's operating mode. Some keyboards have a setting for USB MIDI, computer connection, or MIDI output. Consult the device's own controls or manual and make sure it is set to send MIDI data over the connection you are using.

When the controller or connection may be faulty

Test the controller in Chrome or Edge on another computer, if one is available. If it sends no messages there either, check it with another cable or MIDI interface. A failed cable or interface can look like a broken keyboard. If the controller still sends nothing through a known-good connection, its USB port, MIDI output, or internal electronics may need repair. Check the warranty before paying for service.

MIDI messages are not the same as sound

A MIDI keyboard usually sends instructions, not recorded audio. A key message tells software which note was pressed and how hard, but it does not contain the sound of a piano. The MIDI Test checks those instructions. It will not play the notes for you, and a controller can pass the test even if your music software has no instrument selected or its audio output is muted.

If messages appear in Chrome or Edge but you hear nothing, troubleshoot the instrument and audio settings in your music app separately.