CONVERT
OGG → AU
Tap to choose your fileDRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 100 MB · Free plan · No signup required
Convert to:
Detecting available formats...
Optimize for
Leave empty to use original name. Extension added automatically.
Uploading...
Processing your file...
Fast, secure OGG to AU conversion. No registration required.
Situation. OGG is the royalty-free open container typically holding Vorbis or Opus audio streams. Solution: a AU, produced below. Converting OGG to AU changes the audio container without re-recording anything. Whether you are moving from a studio master to a distribution format or just making a file playable on an old car stereo, KaijuConverter re-encodes the audio with FFmpeg at your chosen bitrate and preserves sample rate, channels and ID3 tags. The source OGG file stays untouched. In practice OGG is the royalty-free open container typically holding Vorbis or Opus audio streams. On the other end, AU is the Sun/NeXT audio format, a historical PCM container still found in older pipelines.
OGG Vorbis Audio
Source formatOGG Vorbis is an open-source, royalty-free lossy audio format. It generally offers better quality than MP3 at equivalent bitrates and is commonly used in gaming, open-source software, and web audio.
Sun AU Audio
Target formatAU is a simple audio format from Sun Microsystems, commonly used on Unix systems.
Why convert OGG to AU
OGG Vorbis Audio is great in its own niche, but Sun AU Audio is either more universally playable or better suited to the device you are targeting. Converting lets you ship the audio without asking listeners to install a codec. The loss in quality between the two is negligible at sensible bitrates.
HOW TO CONVERT
OGG → AU
Upload the OGG
Drop or select your OGG file. The upload is encrypted and the file is queued for conversion.
Transcode via FFmpeg
FFmpeg decodes the OGG stream to PCM internally, then re-encodes as AU at the bitrate you select.
Download the AU
The AU is delivered as a direct download; metadata and cover art transfer automatically where possible.
Common Use Cases
Podcast distribution
Podcast hosts (Spotify, Apple, Acast) publish audio as AU when the workflow requires it; converting upfront skips server-side transcoding.
DAW ingestion
Pro Tools, Logic, Ableton and Reaper pull AU into projects without decode overhead, so scrubbing and waveform display are snappy.
Portable players
AU plays reliably on old iPods, car stereos, Bluetooth speakers and fitness trackers where OGG support is spotty.
Voice memo sharing
Voice notes recorded as OGG travel to phones and desktops as AU without recipients installing extra codecs.
OGG vs AU — Strengths and limitations
What each format does best, and where it falls short.
OGG Strengths
- Completely royalty-free — no patent worries for encoders or decoders.
- Container is streaming-friendly — useful for internet radio.
- Native support in HTML5 <audio>, every major Linux distro, and most audio tools.
- Can multiplex any number of tracks (audio, video, text) in one file.
- Mature tooling via libvorbis, libopus, and FFmpeg.
Limitations
- Apple and Microsoft avoided Ogg historically — iOS and Safari only added Opus support recently.
- Hardware decoder support is rare — encoding for battery-constrained devices (phones) still favors AAC.
- Confusing naming: ".ogg" could be Vorbis, Opus, Speex, or FLAC.
AU Strengths
- Trivially simple format — 24-byte header, then samples.
- µ-law 8-bit variant fits hours of speech in kilobytes.
- Stable since 1988; every major audio library reads it.
- Streaming-friendly: size field is optional.
Limitations
- Aging — obsolete outside legacy and compatibility scenarios.
- No metadata beyond a single annotation string.
- No native multi-channel surround support.
OGG vs AU — Technical specifications
Side-by-side comparison of the technical details.
OGG
- MIME types
- audio/ogg, application/ogg
- Extensions
- .ogg (audio), .oga, .ogv (video), .ogx (app), .opus
- Standard
- RFC 3533 (container), RFC 5334 (MIME)
- Codecs
- Vorbis, Opus, Speex, FLAC, Theora (video), Dirac
- Streaming
- Native (page-based structure)
AU
- MIME types
- audio/basic, audio/au, audio/x-au
- Extensions
- .au, .snd
- Codecs
- PCM 8/16/24/32-bit, µ-law, A-law, IEEE float
- Header
- 24 bytes (magic, offset, size, encoding, rate, channels, info)
- Byte order
- Big-endian
| Specification | OGG | AU |
|---|---|---|
| MIME types | audio/ogg, application/ogg | audio/basic, audio/au, audio/x-au |
| Extensions | .ogg (audio), .oga, .ogv (video), .ogx (app), .opus | .au, .snd |
| Standard | RFC 3533 (container), RFC 5334 (MIME) | — |
| Codecs | Vorbis, Opus, Speex, FLAC, Theora (video), Dirac | PCM 8/16/24/32-bit, µ-law, A-law, IEEE float |
| Streaming | Native (page-based structure) | — |
| Header | — | 24 bytes (magic, offset, size, encoding, rate, channels, info) |
| Byte order | — | Big-endian |
OGG vs AU — Typical file sizes
Approximate file sizes for common scenarios.
OGG
- 3-min music (Vorbis q5 / ~160 kbps) 3.5 MB
- 1-hour podcast (Vorbis q3) 45 MB
- Game sound effects (Vorbis q2) 5-30 KB each
AU
- 10-second clip (8-bit µ-law, 8 kHz) 80 KB
- 10-second clip (16-bit PCM, 44.1 kHz stereo) ~1.7 MB
Quality & Compatibility
Lossy-to-lossy transcoding (most cross-format audio jobs) loses a tiny amount of quality on each pass — usually inaudible at our default VBR ~190 kbps for music or 96 kbps for speech. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy is only as good as the target bitrate you choose.
Tips for Best Results
- Pick 128 kbps for podcasts and voice, 192–256 kbps for music, 320 kbps only if the audio will be edited further downstream.
- Keep the OGG master alongside the AU — re-encoding a lossy format twice accumulates audible artefacts.
- For mono voice content, convert to mono AU explicitly to halve file size without any quality loss.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for AU and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the OGG container to the AU container automatically where both formats support them. If a tag field has no AU equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
RELATED CONVERSIONS
Other popular pairs involving OGG or AU
More from OGG
More ways to reach AU
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
Opus Audio Format: The Complete Technical Guide
Complete technical guide to Opus audio: SILK and CELT engines, hybrid mode, bandwidth modes, bitrate reference from 6 to 510 kbps, Ogg Opus container, latency, browser support, and FFmpeg opusenc encoding commands.
Read guideAAC Audio Format: The Complete Technical Guide
Complete technical guide to AAC: AAC-LC, HE-AAC v1/v2, AAC-ELD profiles, MDCT filter bank, TNS, PNS, joint stereo, bitrate reference, M4A vs ADTS containers, and FFmpeg libfdk_aac encoding commands.
Read guideFLAC: The Complete Guide to Free Lossless Audio Codec
Complete technical guide to FLAC: file structure, STREAMINFO MD5, linear predictive coding, Rice entropy coding, compression levels 0–8, ReplayGain, FLAC vs ALAC, and high-resolution audio encoding commands.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.