Convert AU
Sun/NeXT AU audio. Every pair below runs in the browser. The file is not uploaded. Video and audio use FFmpeg in WebAssembly, fetched from this origin once, about 30 MB, then cached by the service worker. The clip itself is not part of that download.
This hub is the index, not the workbench. Each conversion is its own URL so a search for “AU to something” can land on a page that only does that job. The file picker on those pages expects AU when you are leaving this format, or produces AU when you are arriving. A generic dropdown still exists under Video convert and Audio convert if you would rather pick the destination after you drop the file.
You can check the same way on every pair: open the network panel, drop a AU file, convert it. You should see this origin. You shouldn't see a POST of the file. Google Analytics, if it's on, is page views, not your AU bytes. If a tool needs a server, it isn't on this site.
This site can read it. This site can write it. Engine: ffmpeg.
Convert from AU
- AU to MP3The audio format that still plays everywhere.
- AU to WAVUncompressed PCM. Large, simple, editable.
- AU to M4AAAC in an MPEG-4 audio file.
- AU to OGGVorbis in an Ogg container.
- AU to FLACLossless compressed audio.
- AU to OPUSOpus audio in an Ogg container. Good for speech and music at low bitrates.
- AU to AACRaw or ADTS AAC audio.
- AU to AIFFAudio IFF, common in Apple and pro-audio workflows.
- AU to MKAMatroska audio container (often Opus).
- AU to CAFApple Core Audio Format.
- AU to TTATrue Audio lossless.
- AU to WVWavPack lossless.
Convert to AU
- MP3 to AUThe audio format that still plays everywhere.
- WAV to AUUncompressed PCM. Large, simple, editable.
- M4A to AUAAC in an MPEG-4 audio file.
- OGG to AUVorbis in an Ogg container.
- FLAC to AULossless compressed audio.
- OPUS to AUOpus audio in an Ogg container. Good for speech and music at low bitrates.
- AAC to AURaw or ADTS AAC audio.
- AIFF to AUAudio IFF, common in Apple and pro-audio workflows.
- MKA to AUMatroska audio container (often Opus).
- CAF to AUApple Core Audio Format.
- TTA to AUTrue Audio lossless.
- WV to AUWavPack lossless.
Related: Convert · All formats · How it works