AU Won't Open? Convert to FAP Instantly
Fast, instant AU to FAP conversion. No signup required. Just drop your .au file and get .fap in seconds.
Batch Settings
您是否曾遇到音频文件格式不兼容的困扰？特别是当您在处理一些较旧的音频文件（如AU格式）时，想将其转换为更适合现代设备播放或在线分享的FAP格式，以便在微信上轻松分享给朋友，或者在手机游戏、直播平台中使用。我们深知这种转换的需求在华语地区尤为普遍。无论是为了在智能手机上流畅播放，还是为了在各种社交媒体和内容创作平台上传播，高效、无损的格式转换工具都显得至关重要。现在，您不必再为复杂的转换过程而烦恼，我们的工具能帮助您轻松完成AU到FAP的转换，让您的音频内容焕发新生。
- 微信分享老旧游戏音频
- 手机游戏音效制作
- 直播平台背景音乐适配
AU格式在早期PC和部分Unix系统上较为常见，而FAP作为一种专有或特定应用格式，在华语地区某些内容平台或游戏引擎中可能有其特定应用场景，转换能确保更好的兼容性和播放效果。
About AU to FAP Conversion
Dealing with a AU file that won't open on your device? You're not alone — AU compatibility issues are one of the most common reasons people search for a file converter. AU is a widely used file format.
The fix is simple: convert your AU to FAP. FAP is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting AU to FAP maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your AU file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a FAP file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert AU to FAP
- 1
Add your AU file
Drag and drop your .au file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick FAP output
Select .fap as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The audio engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .fap file. For batch jobs, download all at once as a zip.
What Happens When You Convert AU to FAP
Your AU file is decoded and re-encoded as FAP.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in FAP format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
FAP
.fap file
| Extension | .fap |
| MIME Type | audio/x-fap |
| Category | Audio |
Should You Convert AU to FAP?
When to Convert
- ✓When you need a FAP file
Frequently Asked Questions
Why won't my AU file open?
AU files may not open if your device lacks the right codec or application. Converting to FAP — a more widely supported format — usually resolves this. FAP is a widely used file format.
Is it safe to convert AU to FAP online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting AU to FAP?
Converting AU to FAP maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my AU file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert AU to FAP on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.