AMR vs MMF — Comparison & Free Converter
Fast, instant AMR to MMF (SMAF) conversion. No signup required. Just drop your .amr file and get .mmf in seconds.
Batch Settings
携帯電話の着信音や音声メモとして一世を風靡したAMR形式。しかし、より高音質で多機能なMMF形式への変換をお考えではないでしょうか。当社の変換ツールは、大切な音声データを損なうことなく、スムーズにMMFへと移行させます。ビジネスシーンでの重要な会議録音から、趣味のアニメソングの着信音作成まで、幅広いニーズに対応。特に、かつてのフィーチャーフォン時代に親しまれたMMFは、現在でも特定の用途で根強い人気を誇ります。複雑な設定は一切不要。直感的な操作で、どなたでも手軽にご利用いただけます。新しい音声体験を、ここから始めましょう。
- ビジネス会議の議事録
- アニメ・漫画関連のイベント告知音声
- 伝統芸能の音源保存
かつて日本の携帯電話で主流だったMMF形式は、着メロ文化を支えました。AMRからの変換は、当時の音源を現代の環境で再活用する上で特に意味があります。
About AMR to MMF (SMAF) Conversion
AMR or MMF — which format should you use? The answer depends on your needs. Here's a quick breakdown.
AMR is a speech-optimised audio codec used in mobile voice recordings. It has limited platform support. MMF is a widely used file format. It has common platform support.
So when should you convert AMR to MMF? This conversion is ideal when you When you need a MMF file. This conversion helps you convert between formats quickly.
Converting AMR to MMF maintains high quality with CocoConvert's optimised encoder settings.
If you've decided MMF is the right choice, CocoConvert makes the conversion effortless. Upload your .amr file, pick MMF, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert AMR to MMF (SMAF)
- 1
Choose your AMR file
Upload your .amr file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to MMF
Select .mmf from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large audio files.
- 4
Get your MMF file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert AMR to MMF (SMAF)
Your AMR file is decoded and re-encoded as MMF.
Your AMR file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in MMF format
The converted file is ready for download
Format Comparison
AMR
.amr file
| Extension | .amr |
| MIME Type | audio/amr |
| Category | Audio |
MMF (SMAF)
.mmf file
| Extension | .mmf |
| MIME Type | audio/x-smaf |
| Category | Audio |
Should You Convert AMR to MMF (SMAF)?
When to Convert
- ✓When you need a MMF file
Frequently Asked Questions
Should I use AMR or MMF?
It depends on your goal. AMR offers smaller files via lossy compression. MMF preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is MMF higher quality than AMR?
Not necessarily. Converting AMR to MMF maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert AMR to MMF on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for AMR to MMF?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for AMR to MMF?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.