Specialized Diagnostic

MIDI Controller & Keyboard Tester

Test USB MIDI keyboards, drum pads, pitch bend, and CC controllers online. Monitor MIDI note events, velocity (0-127), and control change messages free.

Click 'Enable MIDI Access' to test USB MIDI keyboards & drum pads...
No MIDI Device Active
LAST MIDI NOTE --
NOTE VELOCITY (0-127) 0
CC MESSAGE / PITCH BEND 0

Live MIDI Event Stream

Click "Enable Web MIDI Access" above to begin monitoring real-time MIDI signals.

MIDI Signal Guidelines

Key velocity ranges from 1 (softest) to 127 (maximum dynamic velocity). Pitch bend and modulation wheel CC messages update continuously.

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Web MIDI API Standard and Controller Diagnostics

The W3C Web MIDI API allows web applications to communicate directly with Musical Instrument Digital Interface (MIDI) hardware over USB or Bluetooth MIDI.

Frequently Asked Questions

How do I test a USB MIDI keyboard or drum pad online?

Connect your USB MIDI keyboard, synthesizer, or drum pad to your computer, click "Enable Web MIDI Access" above, grant browser MIDI permissions, and press keys or pads. Real-time MIDI note events and velocity levels will display.

What MIDI messages does this online tester monitor?

Our tool monitors MIDI Note ON/OFF, Note Velocity (0-127), Continuous Controller (CC) messages, Pitch Bend, and Modulation wheel parameters via the standard Web MIDI API.

Which browsers support Web MIDI API testing?

Google Chrome, Microsoft Edge, Opera, and Brave natively support the Web MIDI API on Windows, macOS, and Linux without installing external MIDI drivers.

100% Client-Side

All Gamepad API data stays in your browser. Zero tracking or data collection.

Instant Results

No downloads, plugins, or software installation needed. Works instantly.

Free Forever

No paywalls, subscription requirements, or hidden usage limits.