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MIDIField Guide

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MIDI ReaderTool
MessagesDocs
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Web MIDI monitorTool

Try “sustain”, “CC 74”, “running status”, “rust”, “soundfont”, “GS reset”.

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Tools
Inspect

Message decoder

Paste raw bytes and see each message decoded, running status and real-time bytes included.

Background Messages RPN & NRPN SysEx

Libraries Utilities

Message decoder

MIDI 1.0 byte stream

Hex bytes

Paste or type bytes, e.g. B0 07 64 or 0x90,0x3C,0x64. Running status and interleaved real-time bytes are handled like a real receiver.

More to inspect

MIDI Reader Open a .mid file and see every part explained: tracks, tempo map, controllers, SysEx, a piano roll, and the raw bytes. Play it with sampled instruments.
Web MIDI monitor Plug in a controller and watch every incoming message decoded live, with a keyboard view and meters.
Clock & latency tester Measure the tempo and jitter of incoming MIDI clock, send clock to a device, and time a round trip through a loopback.
All 12 tools → Inspect, build and send, look up, calculate.

MIDI Field Guide is an open, community-maintained reference. Code MIT, content and data CC0. Contribute on GitHub.

MIDI is a trademark of the MIDI Manufacturers Association. This site is independent and not affiliated with the MMA or AMEI. Always check the official specifications at midi.org/specs.