Convert Advanced Audio Coding (.aac) to Ogg Vorbis (.ogg) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .aac file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .ogg file when it's ready.
AAC (Advanced Audio Coding) was standardized by MPEG in 1997 and became the dominant codec for Apple and streaming platforms. OGG Vorbis, developed by Xiph.org and released in 2000, is an open-source lossy codec that provides comparable quality to AAC without any patent licensing requirements. Converting AAC to OGG is common when targeting open-source platforms, Linux environments, or game engines that prefer the patent-free Vorbis codec.
Vorbis is the default audio codec for many open-source projects, game engines (Unity, Godot, Unreal), and web applications that avoid patent-encumbered formats. Firefox historically supported Vorbis before AAC. Linux distributions ship with Vorbis decoders by default. Spotify uses Vorbis internally for streaming. If your target platform prefers open-source codecs, OGG Vorbis is the standard choice.
FFmpeg decodes the AAC stream to PCM, then encodes using libvorbis at a quality setting from -1 to 10 (default 3, roughly 112 kbps). Vorbis uses modified discrete cosine transform (MDCT) with a flexible block size of 64-8192 samples. The output is wrapped in an OGG container with Vorbis comment metadata tags. Quality 5 (~160 kbps) is generally considered equivalent to 192 kbps AAC.
At matched bitrates, Vorbis and AAC deliver comparable quality. Quality 5 Vorbis (~160 kbps) is transparent for most listeners. Since this is a lossy-to-lossy transcode, some generational loss occurs, though at quality 5+ it is typically inaudible. For archival or editing purposes, convert to FLAC instead.
| Device | AAC | OGG |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
AAC to OGG Vorbis is the bridge between Apple's proprietary ecosystem and the open-source world. At quality 5 or higher, Vorbis delivers transparent audio without patent concerns.
安全传输
HTTPS 加密上传
隐私优先
文件处理后自动删除
无需注册
即刻开始转换
随处可用
任何浏览器，任何设备
| Native |
| 特性 | AAC | OGG |
|---|---|---|
| 全称 | Advanced Audio Coding | Ogg Vorbis |
| 扩展名 | .aac | .ogg |
| 最适合 | Superior to MP3 | Open source |