Click the "Select File" button above, and choose your MMF file.
You'll see a preview.
Click the "Convert file to..." button to save your file in the format you want.
Convert MMF to another file type
The converter easily converts your MMF SMAF files to various formats - free and online. No WinOLS or other Audio software needed.
MMF to MP3
MMF to WAV
MMF to AAC
MMF to FLAC
MMF to OGG
MMF to WMA
MMF to AIFF
MMF to OPUS
MMF to AVI
MMF to MP2
MMF to ISMV
MMF to MPEG
Convert a file to MMF
The converter also works in reverse, so you can convert other "Synthetic Music Ringtone" formats to MMF without using software like WinOLS or a similar tool.
AAC to MMF
TTA to MMF
AU to MMF
WV to MMF
DTS to MMF
FLAC to MMF
MP3 to MMF
PCM to MMF
WAV to MMF
ADX to MMF
AVS to MMF
WSVQA to MMF
About MMF files
The .MMF file format most commonly represents a Synthetic Music Mobile Application Format (SMAF) file. Developed by Yamaha Corporation, these files were widely used in early 2000s mobile phones to store polyphonic ringtones. They synthesize MIDI-like note data alongside ADPCM digital audio to create highly compact sound files. Alternatively, .MMF files can also contain automotive Engine Control Unit (ECU) tuning data used by software like WinOLS and Magic Motorsport tools. The primary disadvantage of the SMAF .MMF format is its severe obsolescence. Modern smartphones, web browsers, and standard media players like VLC do not support it natively. It is a proprietary format built for obsolete hardware synthesizers, making native playback virtually impossible today. Furthermore, attempting to open ECU .MMF files without expensive, specialized automotive mapping tools will result in unreadable binary garbage. To make an audio .MMF file usable today, you must convert it. For broad compatibility across web and modern devices, convert to MP3 or AAC. If you need lossless archiving of the original audio components, convert to WAV. For automotive data, you might need to convert the file into a generic BIN format for standard EPROM flashing. Just drag and drop your file here to analyze and convert it - free, online, and without installing software.
Use Convert.Guru to open and convert your MMF file.
If you want to convert MMF file to MIDI, SMF, M4A or ALAC, you can use WinOLS or similar software from the "Legacy Ringtone Audio Storage" category. In the File menu, look for Save As… or Export….
To convert MIDI, MID or RA files to MMF, try WinOLS or another comparable tool in the "Legacy Ringtone Audio Storage" category.
The MMF Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our MMF converter.