Online MIDI Tester

Web MIDI

Connect a MIDI keyboard or controller and see notes, velocity, control changes and pitch bend in real time.

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Plug in a MIDI keyboard or controller, then enable MIDI access.

Keyboard

A0 – C8 · 88 keys

Last note—

Velocity—

Held0

Program—

Aftertouch—

Message Log

Messages: 0

Source: —

Control Changes

Knobs, faders, pedals

Turn a knob or move a fader

Pitch Bend

Testing MIDI Devices

Uses the Web MIDI API — nothing to install.

Notes & Velocity

An 88-key keyboard lights up with every note and shows its velocity.

Knobs & Faders

Control-change messages appear as bars with their CC number.

Message Log

Every message with channel and data, including pitch bend and aftertouch.

Start in 3 Steps

Connect

Plug in your device and click Enable MIDI.

Allow access

Accept the browser permission prompt.

Play

Press keys, turn knobs and move the pitch wheel.

Frequently Asked Questions

Which browsers support Web MIDI?

Chrome, Edge, Opera and Firefox. Safari does not support Web MIDI.

My device isn't listed

Close other apps (DAWs) that may hold the device exclusively, then reconnect it.

Can it send MIDI?

This tester only listens; it does not send messages.

Bluetooth MIDI?

Pair it in your OS MIDI settings first and it will appear here.

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