Convert AAC to OGG
Convert AAC audio files to OGG Vorbis format directly in your browser. OGG is the preferred audio format in open-source game engines, Wikipedia, and many Linux applications — and is fully royalty-free. No upload needed.
Drag 'n' drop files here, or
click to select files
.aac, .m4a
Drop your files and click Convert to get OGG
//when_to_use
When to Convert AAC to OGG
- Converting AAC sound effects to OGG for inclusion in Godot game projects which prefer royalty-free formats
- Preparing AAC audio clips as OGG for upload to Wikipedia or Wikimedia Commons (which only accept open formats)
- Converting AAC music tracks to OGG for use in Unity game projects targeting Linux or open-source ecosystems
- Migrating AAC podcast episodes to OGG for distribution on Linux-focused platforms or self-hosted RSS feeds
- Converting AAC voice clips to OGG for embedding in open-source apps that avoid patent-encumbered codecs
//comparison
AAC vs OGG
| Property | AAC | OGG |
|---|---|---|
| Compression | AAC MDCT (lossy) | Vorbis MDCT (lossy) |
| Typical file size (4 min) | ~5 MB | ~4 MB |
| Royalty-free | No (patent pool) | Yes (fully open) |
| iOS support | Native (preferred) | None (no decoder) |
| Game engine support | Limited (Unity, Unreal) | Native (Godot, Unity, Unreal) |
| Best for | Apple ecosystem | Open-source, Wikipedia |
//how_it_works
How It Works
Drop your AAC files
Drag and drop or select AAC or M4A files at any bitrate. First use loads FFmpeg WASM (~30MB).
FFmpeg decodes AAC
FFmpeg WASM parses the ADTS or M4A container and decodes the AAC stream to raw PCM samples.
Vorbis encoding at quality 5
PCM is re-encoded with libvorbis at quality level 5 (~160kbps VBR) and wrapped in an Ogg container.
Download your OGG files
Your OGGs are ready for game engines, Wikipedia uploads, or Linux audio applications.
// under the hood
AAC uses MDCT with temporal noise shaping (TNS) and perceptual noise substitution (PNS) for lossy compression. OGG Vorbis uses overlapping MDCT with psychoacoustic masking — also lossy but fully royalty-free. Our converter uses FFmpeg WASM to decode the AAC stream from the ADTS or M4A container to raw PCM, then re-encodes with libvorbis at quality level 5 (~160kbps VBR) wrapped in an Ogg container.
//faq
Frequently Asked Questions
- Why convert AAC to OGG?
- OGG Vorbis is fully royalty-free, while AAC requires patent licensing for commercial distribution. OGG is the standard audio format for game engines like Godot and Unity, Wikipedia/Wikimedia uploads, and many Linux audio applications. If you're building an open-source project or contributing to Wikipedia, OGG is the right format.
- Is there quality loss?
- Yes — both AAC and OGG Vorbis are lossy formats, so transcoding adds a second encoding stage. We encode at quality level 5 (~160kbps VBR), which is high quality. If audio quality is critical, first convert AAC to WAV (lossless decode), then convert the WAV to OGG for a cleaner encode.
- Will OGG play on my devices?
- OGG is supported natively on Android, modern Linux, Windows 10+ (with codec packs), VLC, foobar2000, and most game engines. iOS does not support OGG natively — Apple devices reject Vorbis. If you need iOS playback, use AAC to MP3 instead.
- What's the OGG file size?
- OGG Vorbis at quality 5 typically produces files about the same size as 160kbps AAC. A 4-minute song becomes ~4 MB. OGG and AAC are both highly efficient — there's no significant size difference.
- Are my files uploaded?
- No. FFmpeg WebAssembly runs entirely in your browser. Your AAC files never leave your device.
//related_converters
Related Converters
Similar conversions you might need.
Convert M4A to MP3
Convert Apple M4A audio files to universally compatible MP3.
→Convert AAC to MP3
Convert AAC audio files to widely compatible MP3 format.
→Convert AAC to WAV
Convert AAC audio to uncompressed WAV for editing in DAWs and audio tools.
→Convert AAC to FLAC
Convert AAC audio to FLAC lossless format for archival.
→Convert MP3 to OGG
Convert MP3 audio files to open-source OGG Vorbis format.
→Convert WAV to OGG
Convert uncompressed WAV audio to compact open-source OGG Vorbis format.
→