Converting AAC to OGG Vorbis re-encodes between two similar-quality lossy codecs. The main reason to do this is compatibility with game engines, Linux applications, or web platforms that prefer royalty-free Vorbis to patented AAC.
Drag & drop audio files here, or browse
Drop your AAC files here
Transcoding between lossy codecs loses a little detail. Vorbis and AAC are roughly equivalent in quality at matched bitrates, so as long as you don't drop bitrate you'll end up with audio very close to the source. Starting from original lossless material would always be cleaner.
OGG runs on Android, Linux, Windows (with codecs or VLC), modern browsers except Safari, and every major game engine. The gap is iOS and older Apple hardware.
AAC is the successor the MPEG group designed to replace MP3. At 128 kbps it typically sounds as good as MP3 at 192 kbps. It's the default codec for YouTube audio, iTunes purchases, Apple Music, and nearly every streaming service that isn't using Opus or Vorbis.
OGG Vorbis is a royalty-free lossy codec developed by Xiph.Org. At comparable bitrates it sounds cleaner than MP3, especially at 96 kbps and below, and it's the audio format used by Spotify's streams, most modern games, and open-source projects that want to avoid patent encumbrances.
On typical gear at sensible bitrates (160 kbps+), almost certainly not. On careful headphone listening you may notice subtle changes in cymbals or reverb tails from the double lossy encode.
At the same bitrate they're roughly equivalent in audio quality. AAC has better device support; Vorbis has royalty-free licensing. Pick based on what your target platform wants.
AAC is the successor the MPEG group designed to replace MP3. At 128 kbps it typically sounds as good as MP3 at 192 kbps. It's the default codec for YouTube audio, iTunes purchases, Apple Music, and nearly every streaming service that isn't using Opus or Vorbis.
OGG Vorbis is a royalty-free lossy codec developed by Xiph.Org. At comparable bitrates it sounds cleaner than MP3, especially at 96 kbps and below, and it's the audio format used by Spotify's streams, most modern games, and open-source projects that want to avoid patent encumbrances.
Yes. The converter runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio files are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Files over about 2 GB total can get slow or hit browser memory limits. Process in smaller batches if you run into issues.