Free online AIFF to MXL converter

AIFF files contain recorded audio, while MXL files contain compressed MusicXML notation. The conversion is needed when a notation program requires a score file, but audio must first be transcribed into notes; changing the file extension cannot create musical notation.

What the AIFF format is

AIFF, or Audio Interchange File Format, is an audio container developed by Apple and commonly used for uncompressed PCM recordings. It stores samples, channel information, sample rate, and metadata, usually at higher file sizes than compressed formats such as MP3.

Audio workstations and editors including Logic Pro, GarageBand, Pro Tools, Audacity, and Adobe Audition can create or export AIFF files. You may encounter AIFF when receiving studio recordings, sampled instruments, archival audio, or music exported from macOS software.

What the MXL format is

MXL is the compressed form of MusicXML. It stores structured notation such as pitches, rhythms, measures, clefs, key signatures, dynamics, lyrics, articulations, and part information rather than recorded sound.

Notation applications including MuseScore, Finale, Sibelius, and Dorico can open or export MXL files. MXL is useful for exchanging editable scores between notation programs and is much smaller than uncompressed MusicXML files. It does not preserve the original AIFF recording, microphone characteristics, room sound, or exact performance nuances.

How to actually convert AIFF to MXL

A direct file-format conversion cannot reliably turn polyphonic audio into a score. Use one of these workflows:

1. Use an online converter for a supported direct route. On 101convert.com, select the AIFF-to-MXL conversion if it is listed, upload the AIFF file, choose MXL as the output, and download the result. The service can be used free without installing software. Check the exported score carefully because audio-to-notation recognition may be limited.
2. Transcribe the audio to MIDI. Open the AIFF in an audio-to-MIDI or audio-to-score application, identify the instrument or vocal line, set the tempo and time signature, correct detected notes, and export .mid. Tools such as Melodyne, Basic Pitch, and dedicated audio-to-score applications can assist, but results depend on isolation, tempo stability, tuning, and polyphony.
3. Convert MIDI to MusicXML in notation software. In MuseScore, use File → Open to import the MIDI file, correct quantization, rests, voices, enharmonic spellings, tuplets, ties, and bar lines, then choose File → Export and select compressed MusicXML or the .mxl extension.

For a monophonic recording, first isolate the instrument or vocal part if possible. For multiple instruments, transcribe each stem separately and combine the corrected parts in MuseScore or another notation program.

Quality and compatibility limitations

AIFF preserves a waveform; MXL represents an interpreted musical score. The conversion therefore loses performance details such as timbral changes, vibrato, microtiming, pedal movements, noise, and effects. Automatic recognition can also misread chords, overlapping notes, percussion, rubato, ornamental notes, and changing meters.

Keep the original AIFF as the audio master and treat the MXL as an editable transcription. Open the exported file in the intended notation application to verify instruments, page layout, lyrics, repeats, articulations, and MusicXML compatibility. If a program does not accept MXL, export ordinary MusicXML, usually with the .musicxml extension, instead.