MMF Converter

MMF Converter - Legacy Mobile Ringtone Files

Convert MMF ringtones to MP3, WAV and more. Play legacy mobile audio anywhere.

Drop files to convert

Drag files here or pick them from your device

Expert Tips

What the pros know

Pro Tip

Keep the original .mmf files after converting. They're tiny, and they hold the master copy of the score; each converted file is one performance of it.

Common Mistake

Assuming a silent or half-second result from another tool means the file is damaged. It usually means that tool went looking for recorded audio, and an MMF file barely has any.

Best For

Sorting out a folder of ringtones from an old handset: hearing them again, moving them to a current phone, or pulling one into an editor.

Not Recommended

Don't create new audio in MMF. The format is obsolete with no practical advantages today. Use MP3, AAC, or another modern format.

Frequently Asked Questions

An MMF (SMAF) file is a score for the synthesizer chip in an early-2000s phone: notes, timing, and instrument settings rather than recorded sound. Yamaha created the format, and it was everywhere on feature phones before smartphones.

Modern smartphones (iPhone, Android) do not support MMF playback. Convert MMF to MP3 or M4A for use on current devices.

Most media players cannot open MMF. Convert to MP3 or WAV first. Some specialized audio tools may still support MMF playback.

Close cousins. Both store notes instead of recorded sound. MMF adds Yamaha's instrument voice data and sometimes short samples, so it only made full sense to the chip it was written for.

You likely downloaded ringtones for an older mobile phone. MMF was commonly used on Sony Ericsson, Samsung, and other feature phones in the 2000s.

Yes. Convert MMF to M4R format for iPhone ringtones. The tune is synthesized from the file's score and saved in Apple's ringtone format.

You'll get the right notes and timing. The instrument sound is a close match to the old chip rather than a perfect clone, unless the file brings its own custom voices, which come out exactly as written.

No. MMF is obsolete. Modern phones use MP3, AAC, and other standard audio formats for ringtones and audio playback.

What is MMF?

MMF (SMAF, the Synthetic Music Mobile Application Format) is a ringtone format Yamaha built for the phones of the early 2000s. An MMF file stores very little recorded sound. It holds the notes, timing, and instrument settings for the Yamaha sound chip inside the phone, and that chip played the tune out loud on every call.

The design is also why ordinary audio tools choke on these files: there's no soundtrack to pull out, only playing instructions. We've written up why MMF files defeat normal converters on the blog. This MMF converter gets around it by handing the note data to a software FM synthesizer, which plays the whole tune back the way the phone's chip once did.

Why Convert MMF Files?

MMF is a legacy format with almost no support left:

No modern device support - Smartphones don't play MMF
Archive old ringtones - Convert to MP3 for safekeeping
Use on new phones - Convert to a format your phone accepts
Edit and modify - Convert to WAV for audio editing

Convert MMF to Other Formats

MMF to MP3

The safe default. MP3 plays on anything made in the last two decades.

MMF to WAV

Uncompressed audio. Pick WAV when the file is headed into an editor.

MMF to M4A

The Apple-friendly choice. M4A drops straight into iTunes and the Music app.

MMF to M4R

For iPhone ringtones. M4R is the format iOS expects before a tone appears in Settings.

MMF Technical Information

Full name: Synthetic Music Mobile Application Format (SMAF)
Developer: Yamaha Corporation
File extension: .mmf
Contents: A score of notes and instrument voices, sometimes with short audio samples
Era: Early 2000s feature phones
Status: Legacy format, no modern device support

MMF History

MMF belongs to the polyphonic ringtone era, when phones moved on from single beeps to multi-voice melodies. Handsets with very little memory could play full tunes because a dedicated sound chip did the heavy lifting. Then smartphones brought real audio playback, MP3 and AAC took over, the chips disappeared, and MMF files stopped playing anywhere.

How to Convert MMF Files

Upload your MMF file - Select your legacy ringtone
Choose output format - MP3, WAV, M4A, and more
Download converted file - Play it on any modern device

Works on Any Device

Chrome, Firefox, Safari, and Edge, on Windows, Mac, Linux, iPhone, or Android. No software and no account.

The file uploads to our servers, gets converted there, and comes straight back for download.

Reviewed by ChangeMyFile Team · Last reviewed: April 2026

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