Question 1

How do I play a MIDI file online?

Accepted Answer

Drop your .mid or .midi file into the upload zone above and press Play. The tool parses the MIDI and synthesizes the audio in real time using the Web Audio API — no plugins or uploads.

Question 2

Can I change the instrument while playing?

Accepted Answer

Yes. Use the Instrument dropdown to switch between piano, organ, guitar, strings and 8 other basic synth waveforms. Each track can play a different instrument.

Question 3

Is my MIDI file uploaded anywhere?

Accepted Answer

No. Everything is processed locally in your browser. The file never leaves your device.

Question 4

Why does my MIDI sound different from my music software?

Accepted Answer

This tool uses a simple oscillator-based synthesizer rather than the full General MIDI sound bank. Notes, timing and structure are accurate, but the timbre will sound like a retro synth rather than a sampled instrument.