Online MIDI player

As soon as the file loads you see everything stored in it:

• Length, tempo (including tempo changes), time signature and key signature, if the file contains them.
• The total number of notes and the file format (SMF type 0 or 1, number of tracks, ticks per quarter note).
• Every track with its name, its General MIDI instrument and family (for example Acoustic Grand Piano – Piano), and its note count. Drum tracks on channel 10 are labeled separately.
• Any text embedded in the file, such as titles, copyright lines or karaoke lyrics.

The piano roll draws each track in its own color, with the playhead in the left quarter so you can see what's coming. Click the piano roll or drag the position slider to jump.

Press Play and the file plays through a built-in synthesizer. You can:

• Mute tracks by clicking them, for example to practice your own part along with the rest of the band.
• Change the speed from 0.5× to 2× without changing the pitch of the notes.
• Switch the sound: by instrument (automatic), or all tracks as piano, organ or sine wave.
• Turn drums on or off; they're played with simple synthesized percussion sounds.

The synthesizer is generated in your browser rather than using a sampled General MIDI sound bank, so files open instantly even on a phone. Expect a simple, clear sound rather than a realistic orchestra.

Under Save as audio, choose MP3 at 128, 192 or 320 kbps, or lossless WAV, and click Download. The audio is rendered with your current settings: muted tracks are left out, and the speed and sound choices apply. Rendering happens offline, faster than real time, and files up to 20 minutes long can be exported.

The player reads Standard MIDI Files in format 0 and 1 (the two you'll find almost everywhere), with the .mid or .midi extension. Karaoke .kar files and RIFF-wrapped .rmi files work too, because they contain ordinary MIDI data. Running status, tempo maps, program changes, time and key signature events are all handled. If a file is damaged or not really MIDI, you'll see a short explanation instead of silence.

Your file is read in your browser and never uploaded to a server.

• To learn a piano part, mute the other tracks and set the speed to 0.75× or 0.5×.
• Use the piano roll as a simple visual guide: notes higher on the screen are higher in pitch, and longer bars are longer notes.
• If a file sounds wrong, check the track list: some files put the melody on an unusual instrument, and switching the sound to All tracks piano makes it clearer.
• To edit the notes themselves, open the file in a DAW or notation program. To create a new MIDI file, record one with the online piano.