AMR to AU for Audio Workflows
Fast, instant AMR to AU conversion. No signup required. Just drop your .amr file and get .au in seconds.
Batch Settings
大切な音声ファイル、AMR形式で保存されているものの、AU形式への変換でお困りではありませんか？ 日本のビジネスシーンでは、クリアで安定した音声データが不可欠です。また、アニメやゲーム制作の現場では、特定のオーディオ環境への対応が求められることも少なくありません。AMRは携帯電話での録音によく使われますが、汎用性という点ではAU形式に軍配が上がります。このページでは、AMRファイルをAU形式へとスムーズに変換し、お手持ちの音源をより幅広い環境で活用いただくためのお手伝いをいたします。複雑な設定は不要、どなたでも簡単にご利用いただけますので、ぜひお試しください。
- ビジネス会議録の共有
- アニメ音声素材の互換性確保
- 伝統芸能のデジタルアーカイブ
AU形式は、かつて日本のアミューズメント施設や一部の業務用音響機器で標準的に採用されていた経緯があり、古いシステムとの互換性を保つ上で重宝されることがあります。
About AMR to AU Conversion
Whether you're one of the many musicians, podcasters, and audio engineers who work with AMR files daily, there comes a time when you need AU instead. AMR is a speech-optimised audio codec used in mobile voice recordings.
Here's a typical scenario: you receive a .amr file but your project, platform, or client requires .au. AU is a widely used file format. Rather than searching for desktop software or wrestling with command-line tools, you can convert AMR to AU online in seconds with CocoConvert.
This conversion is ideal when you When you need a AU file. The conversion helps you convert between formats quickly.
Converting AMR to AU maintains high quality with CocoConvert's optimised encoder settings.
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 AMR to AU
- 1
Drop your file
Drag your .amr file onto the converter. Need to process many files? Add up to 5 at once (100 for Pro).
- 2
Set output to AU
Pick AU from the format list. The converter automatically tunes settings for the AMR→AU 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 .au file is ready to plug into your workflow. Download it or share the link (expires in 24 hours).
What Happens When You Convert AMR to AU
Your AMR file is decoded and re-encoded as AU.
Your AMR file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in AU format
The converted file is ready for download
Format Comparison
AMR
.amr file
| Extension | .amr |
| MIME Type | audio/amr |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert AMR to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
Who needs to convert AMR to AU?
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 AMR to AU without losing quality?
Converting AMR to AU maintains high quality with CocoConvert's optimised encoder settings.
Do I need to install software to convert AMR to AU?
No. CocoConvert runs entirely in your browser — no downloads, no plugins. It works on macOS, Windows, Linux, iOS, and Android.
How many AMR 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 AMR to AU conversion?
Yes. CocoConvert offers a Business API for automated conversions. It supports all the same format pairs available in the web interface, including AMR to AU.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.