AMR vs WMA — Comparison & Free Converter
Fast, instant AMR to WMA conversion. No signup required. Just drop your .amr file and get .wma in seconds.
Batch Settings
Generation loss — quality may degrade
AMR uses lossy compression, and so does WMA. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
What compression artifacts to expect
WMA lossy compression can produce smearing, loss of high-frequency detail. At the high quality settings CocoConvert uses by default, these are usually invisible to the eye. Lower quality settings trade visual fidelity for smaller file sizes.
お使いのAMR形式の音声ファイルを、より汎用性の高いWMA形式へ変換したいとお考えですか？ ビジネスシーンでの重要な会議の記録から、趣味で作成した音声コンテンツ、あるいはスマートフォンのボイスメモまで、様々な場面でAMRファイルは利用されています。しかし、再生環境や編集ソフトウェアによっては、互換性の問題に直面することも少なくありません。特に、高音質を維持しつつファイルサイズを最適化したい場合、WMA形式への変換は非常に有効な選択肢となります。当サービスでは、大切な音声データを損なうことなく、スムーズかつ迅速に変換作業を支援いたします。複雑な設定は一切不要。どなたでも簡単にご利用いただけますので、ぜひ一度お試しください。
- ビジネス会議の議事録共有
- アニメ声優オーディション音声の提出
- 伝統芸能の稽古音源整理
日本では、携帯電話での録音にAMRが使われることがありましたが、PCでの汎用性を考えるとWMAへの変換は、特にビジネス文書に添付する際や、縦書き文書との併用時に再生環境を選ばない点で重宝されます。
About AMR to WMA Conversion
AMR or WMA — 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. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections. It has limited platform support.
Full Name: AMR uses Adaptive Multi-Rate Audio, while WMA uses Windows Media Audio. Compression: AMR uses Lossy, while WMA uses Lossy. Typical File Size: AMR uses 0.1 MB per minute (extremely compressed), while WMA uses 1 MB per minute at 128 kbps.
So when should you convert AMR to WMA? This conversion is ideal when you When you specifically need a WMA file for your workflow. This conversion helps you convert between formats quickly.
AMR uses lossy compression, and so does WMA. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible. Common misconception: ""I'll convert to WMA and then back to AMR — it'll be the same"" — in reality, each lossy conversion cycle permanently degrades quality. going amr → wma → amr will produce a noticeably worse file than the original. always keep your source file.
If you've decided WMA is the right choice, CocoConvert makes the conversion effortless. Upload your .amr file, pick WMA, 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 WMA
- 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 WMA
Select .wma 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 WMA file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert AMR to WMA
Your AMR audio is decoded into raw PCM samples, then re-encoded as WMA. Some audio data is permanently discarded during compression.
Your AMR file is decoded — compressed audio becomes raw PCM waveform data
The raw audio is re-encoded using Windows Media Audio's lossy codec
Metadata (tags, artwork, track info) is transferred where WMA supports it
The WMA file is saved and ready for download
AMR vs WMA — Detailed Comparison
| Feature | .AMR | .WMA |
|---|---|---|
| Full Name | Adaptive Multi-Rate Audio | Windows Media Audio |
| Compression | Lossy | Lossy |
| Typical File Size | 0.1 MB per minute (extremely compressed) | 1 MB per minute at 128 kbps |
| Platform Support | Limited | Limited |
| Browser Support | none | none |
| Year Created | 1999 | 1999 |
| Open Standard | Yes | No |
Should You Convert AMR to WMA?
When to Convert
- ✓When you specifically need a WMA file for your workflow
When NOT to Convert
- ✗You're converting just because the file "seems old" — re-encoding lossy-to-lossy always degrades quality
Common Mistakes When Converting AMR to WMA
"I'll convert to WMA and then back to AMR — it'll be the same"
Each lossy conversion cycle permanently degrades quality. Going AMR → WMA → AMR will produce a noticeably worse file than the original. Always keep your source file.
Frequently Asked Questions
Should I use AMR or WMA?
It depends on your goal. AMR offers smaller files via lossy compression. WMA offers smaller files via lossy compression. Choose based on whether file size or quality matters more for your use case.
Is WMA higher quality than AMR?
Not necessarily. AMR uses lossy compression, and so does WMA. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible. Quality depends on the compression type and settings, not just the format name.
Can I convert AMR to WMA 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 WMA?
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 WMA?
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.