Free online SMF to MUSICXML converter

What the SMF format is

SMF means Standard MIDI File, the sequencer file format commonly identified by .mid, .midi, or .smf. It stores musical events such as note-on and note-off messages, pitch, velocity, channel, program changes, controller data, tempo changes, and time signatures; it does not store recorded audio.

Type 0 SMF files place all channels in one track, while Type 1 files separate channels or musical parts across synchronized tracks. Type 2 files can contain independent sequences but are less common. DAWs, MIDI sequencers, notation programs, arranger keyboards, digital pianos, and hardware workstations create or export SMF files. You encounter them when transferring a performance between MIDI equipment, archiving a keyboard arrangement, or importing a sequenced part into notation software.

What the MUSICXML format is

MusicXML is an XML-based interchange format for written music. It represents measures, pitches, durations, rests, clefs, key signatures, time signatures, staff assignments, lyrics, articulations, dynamics, ornaments, and other notation data that SMF does not encode directly.

MusicXML is suited to moving a score between notation applications while preserving editable musical structure. Applications may use the .musicxml or compressed .mxl extension. Use it when the destination program must edit or print notation rather than merely play MIDI events.

How to convert SMF to MUSICXML

Using MuseScore

1. Install and open MuseScore Desktop.
2. Choose File → Open and select the .mid, .midi, or .smf file.
3. Review the MIDI import settings. Set the intended instrument or staff arrangement, and enable quantization or simplify the notation if the import dialog provides those options.
4. Open the imported score and correct the time signature, key signature, tempo, tuplets, beaming, rests, voices, and staff assignments.
5. Choose File → Export, select MusicXML as the format, and save as .musicxml or .mxl if the destination supports compressed MusicXML.

MuseScore is usually the most practical desktop route because it converts MIDI events into notation and provides an immediate editing environment. For a conversion without installing software, the 101convert.com website can convert the file online for free; upload the SMF, choose MusicXML as the output, run the conversion, and download the result.

Quality and compatibility limitations

SMF describes performance timing, not necessarily the notation intended by the composer. A human-performed passage may import as many short notes, tied fragments, or rests because of timing variation. Quantization can produce readable rhythms, but an overly strong setting can change intended syncopation or ornamental timing.

MIDI channel assignments do not reliably identify score staves, and a single channel may contain several voices. Inspect staff allocation, voice separation, clefs, transposition, and instrument ranges after conversion. Sustain-pedal data can make apparent note lengths differ from their written durations.

Many notation details require reconstruction because SMF may omit lyrics, chord symbols, articulations, dynamics, phrasing, enharmonic spelling, and precise layout. Playback tempo and controller information may transfer, but they do not guarantee equivalent printed notation. Open the exported MusicXML in the target application and proofread every measure before publication or engraving.