Convert MIDI to ASCII

A script, version-control system, terminal utility, or archive may require musical data as readable text instead of a binary Standard MIDI File. The correct output depends on the receiving software: MIDI CSV preserves events, while ABC notation represents readable musical notation.

What the MIDI format is

MIDI files store performance instructions rather than recorded sound. A Standard MIDI File can contain tracks, note-on and note-off events, pitches, velocities, channels, controller changes, program changes, tempo, meter, text, and system-exclusive data. Files normally use .mid or .midi and are exchanged among sequencers, digital audio workstations, notation programs, electronic instruments, and hardware.

Programs such as Logic Pro, Cubase, Ableton Live, REAPER, GarageBand, MuseScore, and Sibelius can create or import MIDI. The file contains timing and event data, not the instrument samples or recorded audio needed to reproduce the sound by itself.

What ASCII means for music files

ASCII is a 7-bit character encoding, not a universal musical file format. A text representation must define how MIDI headers, tracks, timing, event types, and data bytes are written. Common targets include:

• MIDI CSV: comma-separated text records that describe MIDI events and are suitable for inspection, scripts, and round-trip conversion with compatible tools.
• ABC notation: plain text describing notes, rhythm, key, meter, voices, and musical text; it is intended for notation tools rather than exact performance preservation.
• Custom event logs: application-specific text containing only the fields required for analysis or processing.

ASCII text is easy to inspect, diff, generate, and process with shell or programming tools. It does not preserve the original MIDI file's binary encoding, such as chunk layout, running-status choices, or exact byte arrangement. A defined text format can preserve equivalent musical events, but a generic text dump cannot be reconstructed reliably.

How to convert MIDI to ASCII

Use MIDI CSV for event-level conversion

Fourmilab MIDI Utilities provides the established midicsv and csvmidi command-line programs. The package is distributed for common desktop platforms and as source, so installation details depend on the release and operating system.

1. Install the package containing midicsv. Install csvmidi too if the text must later be converted back.
2. Open a terminal in the directory containing the MIDI file.
3. Run midicsv composition.mid composition.csv.
4. Give composition.csv to the script or application that expects MIDI CSV. Rename it to composition.txt only when an extension requirement makes that necessary; renaming does not change its comma-separated structure.

To rebuild a MIDI file after editing supported records, run csvmidi composition.csv restored.mid. Keep the original and validate the restored file, because invalid records or unsupported edits can alter timing, playback, metadata, or reconstruction success. MIDI CSV preserves event information substantially better than notation formats, but it is not a byte-for-byte copy of the source MIDI file.

Use ABC for readable notation

The open-source abcMIDI package includes mid2abc. Run mid2abc composition.mid > composition.abc, then open the result in an ABC-compatible editor or notation workflow. The .abc extension identifies ABC notation, not generic ASCII and not MIDI CSV.

Check the generated key, meter, tempo, voices, tuplets, note lengths, and rests. MIDI often contains expressive timing, overlapping notes, controller data, percussion channels, or dense polyphony that cannot be represented exactly in conventional ABC notation. Manual correction is commonly required.

Write a project-specific text dump

Python's mido package can read MIDI tracks and write selected fields to a text file. For example, this command prints each message and its delta time:

python -c "import mido,sys; m=mido.MidiFile(sys.argv[1]); [print(track_no, msg) for track_no,track in enumerate(m.tracks) for msg in track]" composition.mid

This output is an inspection log, not a standard or reversible conversion. A reversible custom format must record the MIDI header, track boundaries, delta times, event types, channels, data bytes, and any required system-exclusive or metadata events. Write with an explicit ASCII encoding and a defined escaping rule if strict 7-bit output is required; UTF-8 text is not automatically ASCII.

Software and online compatibility

Guitar Pro can import MIDI and export guitar tablature as ASCII-style text in workflows where the target is readable guitar tab. That export is not a general MIDI-to-ASCII event conversion and can lose timing detail, non-guitar tracks, controllers, and other MIDI data. MuseScore and most notation applications are better suited to a score, MusicXML, or PDF target than to generic ASCII.

No universal online MIDI-to-ASCII standard exists, so a browser converter is suitable only when it explicitly identifies the required target, such as MIDI CSV or ABC. Verify the downloaded records with the receiving application; services advertised as “MIDI to text” may produce a summary, lyrics, MusicXML, or notation rather than an interchangeable text representation. Do not upload unpublished compositions or files containing sensitive metadata unless the service's handling policy is acceptable.

Quality and compatibility limits

Confirm the destination's expected format and dialect before converting. A file named .txt may be a human-readable dump, MIDI CSV, ABC notation, or a proprietary representation, and those formats are not interchangeable. Preserve the original MIDI file because conversion cannot recover information omitted by a text export.

Test tempo maps, time signatures, track names, program changes, percussion channels, controller events, overlapping notes, and system-exclusive data after conversion. A text format that preserves note events may still omit instrument definitions, proprietary device messages, or the exact performance behavior required by the original hardware or sequencer.