Free online MIDI to RTTTL converter

A legacy mobile phone, ringtone editor, embedded device, or service may accept RTTTL but reject standard MIDI. Converting creates a small text ringtone from a MIDI melody, not an audio recording or a complete copy of the original performance.

What the MIDI format is

MIDI is performance data, not recorded sound. A Standard MIDI File with a .mid or .midi extension can contain note numbers, start times, durations, velocity, channels, tempo, program changes, controller events, lyrics, and multiple tracks, but it does not contain instrument audio.

Digital audio workstations, sequencers, synthesizers, and notation applications use MIDI to exchange arrangements and performances. Programs such as Ableton Live, Logic Pro, Cubase, Pro Tools, GarageBand, FL Studio, and MuseScore can create or edit MIDI files.

What the RTTTL format is

RTTTL, or Ring Tone Transfer Language, is a compact text format designed mainly for monophonic mobile-phone ringtones. A typical string is name:d=4,o=5,b=120:c,e,g. The name precedes the first colon; the defaults define note duration, octave, and tempo; the final field contains notes and pauses.

RTTTL uses text note names such as c, f#, and p for pause, with optional duration, octave, and dotted-note modifiers. Its small size makes it easy to paste, edit, archive, and embed in firmware, but implementations vary in their support for dotted notes, octave ranges, duration values, ringtone length, and maximum name length.

How to convert MIDI to RTTTL

1. Open the MIDI in MuseScore, a DAW, or another sequencer. Identify the track containing the intended melody instead of treating the entire file as one ringtone.
2. Make a working copy, then delete or mute accompaniment, percussion, chords, arpeggios, and other tracks. RTTTL is normally monophonic; overlapping notes must be removed, serialized, or reduced to one pitch. Export separate working files if the MIDI contains several possible melodies.
3. Remove or ignore expression data that RTTTL cannot represent, including instrument changes, controller events, sustain-pedal data, pitch bends, aftertouch, and most velocity changes. Quantize unusual timings to note lengths supported by the target parser, commonly quarter, eighth, and sixteenth notes.
4. Save the reduced sequence as a new MIDI file with File → Export → MIDI. Keeping the original preserves the full arrangement for later editing.
5. Convert the cleaned MIDI with a dedicated MIDI-to-RTTTL utility. Awave Studio is a desktop option when the installed version lists RTTTL or Nokia RTTTL as an output format: open the MIDI, select the melody track if offered, choose the RTTTL output, and set the tempo and pitch range. MuseScore itself is useful for preparation but does not generally export RTTTL directly.
6. For a browser-based conversion, Mobilefish provides a MIDI-to-RTTTL converter. Upload only the cleaned, non-sensitive MIDI, confirm that the service outputs RTTTL text rather than an audio ringtone, and download the result. Online converters often provide fewer controls for track selection and device limits than desktop software.
7. Save the output with an .rtttl extension, then inspect it in a plain-text editor. It should contain a name, a colon, settings such as d=4,o=5,b=120, a second colon, and a comma-separated note sequence. Some phones require the RTTTL string without the filename or extension, so follow the target device's import instructions.
8. Test the text in the exact phone, firmware, ringtone library, microcontroller parser, or service that will use it. If it fails, shorten the name, remove unsupported dotted notes or sharp notation, reduce the pitch range, and shorten the ringtone according to that parser's specification.

Quality and compatibility limits

A MIDI file can contain several independent melodies, chords, tempo changes, swing, triplets, precise tick timing, and sustain effects. RTTTL normally provides one note stream and one global tempo, so a converter must discard or approximate those features. A polyphonic arrangement cannot be preserved as polyphony; selecting the melody before conversion usually produces a more predictable result than automatic reduction.

MIDI velocity and instrument assignments do not determine RTTTL playback, because the receiving phone or device supplies its own tone generator. Tempo changes also cannot be retained reliably when RTTTL provides only one b= value. Quantization can change the groove, and removing sustain data can make held notes sound shorter.

RTTTL syntax is not implemented identically everywhere. One parser may accept f#, dotted durations, or a broad octave range while another rejects them; some devices impose strict ringtone-length and filename limits. A syntactically valid file can therefore remain incompatible with the destination, making testing on the actual hardware or software necessary.