MIDI Player

The 'MIDI Player' is a browser-based online MIDI playback and analysis tool that lets you simply drag and drop your standard MIDI files (SMF: .mid / .midi) into the browser to instantly play MIDI music and automatically analyze and display detailed song information—including MIDI format type, track count, tempo BPM, time signature, total note count, and each track's instrument name, note count, and channel number—all completely free and without any software installation.

Powered by a Web Audio API synthesizer engine, it faithfully reproduces instrument timbres for high-quality playback. With velocity-based dynamic volume control and waveform selection by track and channel, it generates more realistic audio. Additionally, a piano roll-style canvas visualization allows you to visually and in real-time examine the song structure and note placement. A white-key and black-key background pattern improves visual clarity.

Transport controls for play, pause, and stop along with a seek bar let you jump to any position in the song. Whether you are a DTM beginner wanting to inspect the contents of MIDI files, a composer or arranger needing to quickly check track configurations and instrumentation of reference songs, or an educator using MIDI data as teaching material, this tool proves invaluable for all MIDI-related tasks.

To tap-check the tempo of a song by ear, use [Find Song BPM](/en/audio/bpm-counter/). For steady practice at a fixed tempo, use the [Online Metronome](/en/audio/online-metronome/). If you need to analyze the key of an audio recording rather than a MIDI file, use the [Music Key Detector](/en/audio/music-key-detector/). For single-note frequency and note-name checks, use the [Audio Pitch Detector](/en/audio/audio-pitch-detector/). All processing is completed entirely within browser JavaScript, and files are never uploaded to any server.