Convert Ogg Audio (.oga) to Advanced Audio Coding (.aac) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .ogg 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 .aac file when it's ready.
Converting OGA to AAC transcodes Ogg Audio (Vorbis or FLAC inside an Ogg container) to Advanced Audio Coding. Both Vorbis and AAC are modern perceptual codecs — Vorbis from the open-source world (Xiph.org), AAC from the standards body world (MPEG). Converting between them changes the ecosystem while maintaining comparable quality.
OGA files using the .oga extension are the audio-only convention from Xiph.org's naming scheme. They contain the same audio as .ogg files — the extension simply clarifies the content type for file managers and operating systems.
While OGA/Vorbis is excellent, AAC has broader device support — particularly on Apple devices (iPhone, iPad, Mac, Apple TV) where Vorbis is not natively supported. Converting OGA to AAC ensures playback on the entire Apple ecosystem and most web browsers.
Streaming platforms, podcast directories, and music distribution services generally accept AAC but not OGA/Vorbis. Converting to AAC is often the required step for professional audio distribution through these channels.
FFmpeg decodes the OGA container's Vorbis audio (MDCT-based lossy) or FLAC audio (lossless) to PCM, then encodes to AAC using the native aac or libfdk_aac encoder. Since Vorbis-to-AAC is a lossy-to-lossy transcode, there is inherent generation loss. For OGA/FLAC to AAC, only single-generation lossy encoding applies. Match or slightly exceed the OGA Vorbis bitrate when choosing AAC bitrate.
AAC at 128 kbps is roughly equivalent to Vorbis at 128 kbps — both provide excellent quality. When transcoding from OGA/Vorbis at 128 kbps, use AAC at 128-160 kbps to account for generation loss. From OGA/FLAC, AAC at 128 kbps captures near-transparent quality from the lossless source.
| Device | OGG | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| 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
OGA to AAC provides universal device compatibility from open-source audio. Match the OGA bitrate in AAC for equivalent quality.
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| No |
| 特徴 | OGG | AAC |
|---|---|---|
| 正式名称 | Ogg Vorbis | Advanced Audio Coding |
| 拡張子 | .ogg | .aac |
| 最適な用途 | Open source | Superior to MP3 |