NeXT/Sun sound
Writableaudio
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Identify it
| Extensions | .au.snd |
|---|---|
| MIME types | audio/basic |
| Signatures | 2e736e64000000 at byte 0 (NeXT/Sun sound)2e736e64 at byte 0 |
| PRONOM | x-fmt/139 |
| Wikidata | Q672985 |
Not sure your file is this? Identify it from its first bytes, in your browser.
Open it
- FFmpegOpen source
- libsndfileOpen source
- Apache TikaOpen source
- FFmpeg (WebAssembly)Open source
- Music on ConsoleOpen source
- PhotoRecOpen source
- Q191782Open source
- Q3898244Open source
Convert it
Convert a file in your browser The steps marked “in browser” run on your machine; nothing is uploaded.
| To | With | Fidelity | Command and losses |
|---|---|---|---|
| FLAC (Free Lossless Audio Codec) 1.2.1 | FFmpeg | Lossless | ffmpeg -i in.au out.flacLossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata. |
| FLAC (Free Lossless Audio Codec) 1.2.1 | FFmpeg (WebAssembly) | Lossless | in browser Lossless for decoded audio; a lossy source stays as degraded as it was. |
| Waveform Audio | FFmpeg | Lossless | ffmpeg -i in.au out.wavLossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata. |
| Waveform Audio | FFmpeg (WebAssembly) | Lossless | in browser Lossless for decoded audio; a lossy source stays as degraded as it was. |
| Advanced Audio Coding | FFmpeg (WebAssembly) | Lossy | in browser Lossy re-encoding. |
| Matroska 1-4 | FFmpeg | Lossy | ffmpeg -i in.au out.mkvRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| MPEG 1/2 Audio Layer 3 | FFmpeg | Lossy | ffmpeg -i in.au out.mp3Lossy re-encoding. |
| MPEG 1/2 Audio Layer 3 | FFmpeg (WebAssembly) | Lossy | in browser Lossy re-encoding. |
| MPEG-4 Part 14 | FFmpeg | Lossy | ffmpeg -i in.au out.mp4Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| Ogg | FFmpeg | Lossy | ffmpeg -i in.au out.oggLossy re-encoding. |
| Ogg | FFmpeg (WebAssembly) | Lossy | in browser Lossy re-encoding. |
| Ogg Opus Codec Compressed Multimedia File | FFmpeg (WebAssembly) | Lossy | in browser Lossy re-encoding. |
| WebM | FFmpeg | Lossy | ffmpeg -i in.au out.webmRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
Documentation
Sources
From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), WebAssembly engines (ImageMagick, FFmpeg, Pandoc, 7-Zip, GDAL, Assimp, resvg), Just Solve the File Format Problem (File Formats Wiki), Kaitai Struct format gallery, PRONOM, Wikidata. Updated 2026-10-25.