AU Won't Open? Convert to 3GP Instantly
Fast, instant AU to 3GP conversion. No signup required. Just drop your .au file and get .3gp in seconds.
Batch Settings
您是否遇到过这样的情况：手头有些AU格式的音频文件，想在手机上播放，或是分享给朋友，却发现手机不认、微信也发不出去？别急，这正是我们提供AU转3GP服务的理由。AU文件虽然在某些专业音频处理场景中常见，但其兼容性在移动设备和日常分享中并不理想。而3GP格式，作为一种历史悠久且广泛支持的移动媒体格式，尤其是在功能机时代和早期智能手机中，因其小巧的体积和良好的播放适应性而备受青睐。将AU转换为3GP，不仅能让您的音频文件“瘦身”，更重要的是，它能让这些声音内容轻松跨越设备障碍，无论是在老旧手机上回味经典，还是在网络条件不佳时快速分享，都能畅通无阻。我们的工具旨在为您提供一个简单、高效的转换体验，让您的音频文件焕发新的活力。
- 微信分享老旧音频
- 手机游戏背景音适配
- 低流量移动设备播放
在亚洲地区，特别是早期智能手机和功能机普及阶段，3GP格式因其对带宽和存储的低要求，在移动内容分享和流媒体中扮演了重要角色，至今仍有其特定应用场景。
About AU to 3GP 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 3GP. 3GP is a mobile video format designed for small file sizes on cellular networks. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting AU to 3GP 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 3GP 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 3GP
- 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 3GP output
Select .3gp 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 .3gp file. For batch jobs, download all at once as a zip.
What Happens When You Convert AU to 3GP
Your AU file is decoded and re-encoded as 3GP.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in 3GP format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
3GP
.3gp file
| Extension | .3gp |
| MIME Type | video/3gpp |
| Category | Audio |
Should You Convert AU to 3GP?
When to Convert
- ✓When you need a 3GP 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 3GP — a more widely supported format — usually resolves this. 3GP is a mobile video format designed for small file sizes on cellular networks.
Is it safe to convert AU to 3GP 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 3GP?
Converting AU to 3GP 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 3GP 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.