Free online CAPX to MXL converter

CAPX scores need conversion when a notation program or collaborator accepts MusicXML but cannot open Capella’s native project format. MXL is the compressed MusicXML option for sharing complete score notation in a smaller file.

What the CAPX format is

.capx is Capella’s XML-based score format, used by the Capella music-notation program. It stores editable notation, rather than recorded audio, and is typically encountered when someone shares a score created in Capella.

What the MXL format is

.mxl is compressed MusicXML, an interchange format for written music. It is useful for moving scores between notation applications that support MusicXML; compression makes it smaller than uncompressed MusicXML. It contains notation data, not audio.

Convert online on 101convert.com

1. Upload the CAPX file on the converter page. The page displays the per-file size limit.
2. Choose the MXL conversion and start it. Several files can be converted together as a batch; conversion runs on the site’s server with MuseScore.
3. Download the resulting MXL file.

Convert offline with desktop software

Capella can open its own CAPX files and export MusicXML. For an offline workflow, use Capella to export an uncompressed MusicXML file, then use the free, open-source MuseScore desktop application to save it as MXL:

1. Open the CAPX score in Capella and choose File → Export → MusicXML. Save the exported file, for example, as score.musicxml.
2. Open score.musicxml in MuseScore. Choose File → Export, select compressed MusicXML (.mxl) as the output format, and save the file.

MuseScore runs on Windows, macOS, and Linux. Menu labels can differ between software versions.

Quality and compatibility

MXL preserves score notation, not Capella’s editable project features. Check the converted score for layout changes and differences in notation elements, especially if it will be edited or printed in another application. MXL is a notation interchange file, not a substitute for an audio export.