WMA to AMR for Audio Workflows
Fast, instant WMA to AMR conversion. No signup required. Just drop your .wma file and get .amr in seconds.
Batch Settings
Generation loss — quality may degrade
WMA uses lossy compression, and so does AMR. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Some metadata may not survive
Your WMA file may contain ASF metadata, DRM tags metadata. AMR has limited or no support for these metadata types. Location data (GPS), camera settings, and color profiles may be stripped during conversion.
What compression artifacts to expect
AMR lossy compression can produce heavy distortion, narrow bandwidth (speech only). 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.
お気に入りのWMAファイルを、携帯電話での利用に最適なAMR形式へ変換しませんか？クリアな音質を保ちつつファイルサイズを抑えられるAMRは、特にビジネスシーンでの音声メモや、友人との手軽なやり取りに重宝されています。また、縦書き表示が一般的な日本のコンテンツ作成において、音声データも場所を選ばずスムーズに扱えることは大きな利点です。この変換ツールを使えば、お使いのデバイスに合わせた最適な音声環境を簡単に手に入れることができます。複雑な設定は不要。たった数クリックで、あなたのWMAファイルをどこでも再生可能なAMRへと生まれ変わらせましょう。
- ビジネス会議の議事録を同僚と共有
- アニメや漫画のセリフをボイスメモとして保存
- 携帯小説の朗読音声を友人へ送付
かつてフィーチャーフォンが主流だった日本では、AMRは着信音やボイスメッセージの標準形式として広く利用されていました。そのため、古い携帯電話で録音されたWMA形式の音声を現代のスマートフォンで再生する際に、AMRへの変換が役立つことがあります。
About WMA to AMR Conversion
Whether you're one of the many musicians, podcasters, and audio engineers who work with WMA files daily, there comes a time when you need AMR instead. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections.
Here's a typical scenario: you receive a .wma file but your project, platform, or client requires .amr. AMR is a speech-optimised audio codec used in mobile voice recordings. Rather than searching for desktop software or wrestling with command-line tools, you can convert WMA to AMR online in seconds with CocoConvert.
This conversion is ideal when you When you specifically need a AMR file for your workflow. The conversion helps you convert between formats quickly.
WMA uses lossy compression, and so does AMR. 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 AMR and then back to WMA — it'll be the same"" — in reality, each lossy conversion cycle permanently degrades quality. going wma → amr → wma will produce a noticeably worse file than the original. always keep your source file.
Behind the scenes, CocoConvert uses industry-standard tools — FFmpeg for audio and video, Sharp for images, qpdf for documents. Your file is uploaded securely (TLS encryption), processed on isolated servers in Germany, and auto-deleted within 24 hours. No account, no watermark, no hidden fees.
Power users can batch convert up to 100 files simultaneously with a Pro subscription, making it practical for production workflows.
How to Convert WMA to AMR
- 1
Drop your file
Drag your .wma file onto the converter. Need to process many files? Add up to 5 at once (100 for Pro).
- 2
Set output to AMR
Pick AMR from the format list. The converter automatically tunes settings for the WMA→AMR pair.
- 3
Hit Convert
Processing happens server-side — your browser stays responsive. Most audio files convert in under 10 seconds.
- 4
Download and use
Your .amr file is ready to plug into your workflow. Download it or share the link (expires in 24 hours).
What Happens When You Convert WMA to AMR
Your WMA audio is decoded into raw PCM samples, then re-encoded as AMR. Some audio data is permanently discarded during compression.
Your WMA file is decoded — compressed audio becomes raw PCM waveform data
The raw audio is re-encoded using Adaptive Multi-Rate Audio's lossy codec
Metadata (tags, artwork, track info) is transferred where AMR supports it
The AMR file is saved and ready for download
WMA vs AMR — Detailed Comparison
| Feature | .WMA | .AMR |
|---|---|---|
| Full Name | Windows Media Audio | Adaptive Multi-Rate Audio |
| Compression | Lossy | Lossy |
| Typical File Size | 1 MB per minute at 128 kbps | 0.1 MB per minute (extremely compressed) |
| Platform Support | Limited | Limited |
| Browser Support | none | none |
| Year Created | 1999 | 1999 |
| Open Standard | No | Yes |
Should You Convert WMA to AMR?
When to Convert
- ✓When you specifically need a AMR 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 WMA to AMR
"I'll convert to AMR and then back to WMA — it'll be the same"
Each lossy conversion cycle permanently degrades quality. Going WMA → AMR → WMA will produce a noticeably worse file than the original. Always keep your source file.
Frequently Asked Questions
Who needs to convert WMA to AMR?
This conversion is commonly used by musicians, podcasters, and audio engineers. Typical reasons include convert between formats quickly and ensuring compatibility with downstream tools or platforms.
Can I convert WMA to AMR without losing quality?
WMA uses lossy compression, and so does AMR. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Do I need to install software to convert WMA to AMR?
No. CocoConvert runs entirely in your browser — no downloads, no plugins. It works on macOS, Windows, Linux, iOS, and Android.
How many WMA files can I convert at once?
Free users can convert up to 5 files per hour. Pro subscribers get 100 files per hour with larger size limits (5 GB per file). Business API users can integrate batch conversion directly into their tools.
Is there an API for WMA to AMR conversion?
Yes. CocoConvert offers a Business API for automated conversions. It supports all the same format pairs available in the web interface, including WMA to AMR.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.