OGA to AU Converter

OGA to AU Converter

OGA is the audio-only Ogg container from the Xiph.Org Foundation, normally carrying the Vorbis codec — a modern, patent-free lossy format. AU (.au / .snd) is one of the oldest audio formats still in use: introduced by Sun Microsystems, it stores raw μ-law, A-law, or PCM samples behind a tiny header. This conversion exists for legacy Unix workflows, μ-law telephony pipelines, and old systems that only read AU — it is not an upgrade in quality, so the notes below matter before you convert.

OGA Format at a Glance

AU Format at a Glance

How to Convert OGA to AU

1. Upload Your OGA File: Drag and drop your .oga file onto the page or click "Add Files." You can queue several files and convert them with the same settings.
2. Set Audio Channel and Sample Rate: Leave both at "Original" to preserve the source, or pick Mono and a lower sample rate (for example 8000 Hz) to match a μ-law/telephony target.
3. Trim (Optional): Set a start time and duration under Trim if you only need part of the clip.
4. Convert and Download: Click Convert and download the AU file. No sign-up, no watermark.

Why This Conversion Loses Quality

OGA's Vorbis stream is already lossy, so the detail discarded during the original encode is gone for good — no target format can rebuild it. Converting onward to AU does one of two things. If the output uses 8-bit μ-law (the historical AU default, the same companding used in G.711 telephony), you re-encode lossy audio into a roughly telephone-grade 8-bit stream and add a second layer of loss. If the output uses linear PCM instead, the file becomes uncompressed and noticeably larger than the OGA, without recovering any quality that the Vorbis stage already removed. AU only makes sense when a specific old system or pipeline requires it.

Frequently Asked Questions

Will converting OGA to AU improve the audio quality?

No. The OGA source is lossy Vorbis, so quality is already capped by the original encode. Converting to AU cannot add back detail, and an 8-bit μ-law AU output will sound worse than the OGA. AU is a compatibility target, not a quality upgrade.

What encoding does the AU file use, and is it compressed?

AU is a flexible container. The historical and most common payload is 8-bit μ-law, a logarithmic companding scheme that roughly halves the size of 16-bit audio at telephone quality. AU can also hold A-law or linear PCM at 8, 16, 24, or 32 bits; the PCM variants are uncompressed and technically lossless, which makes those files considerably larger than the lossy OGA.

What programs can open an AU file?

AU dates back to Sun and NeXT Unix systems, but several modern players read it, including VLC, Audacity, Apple QuickTime, Winamp, and Adobe Audition. On most desktops you will need a media player rather than a default OS handler, since AU is no longer a common everyday format.

Should I convert OGA to MP3 or WAV instead?

For almost everyone, yes. If you want broad device and app compatibility, convert OGA to MP3 — MP3 plays nearly everywhere. If you need a standard uncompressed file for editing or archival, convert OGA to WAV. Choose AU only when a legacy Unix, μ-law, or NeXT-era workflow specifically requires it.

How can I keep the AU file small versus standard?

For a smaller file, set Audio Channel to Mono and lower the Audio Sample Rate (8000 Hz suits μ-law/voice work), which trims data before encoding. For a larger but cleaner file, keep stereo and a 44100 Hz sample rate so a PCM-based AU retains full-band audio at the cost of size.

Are my files private during conversion?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public. In our experience, a short OGA clip converts in a few seconds once the upload finishes, so upload time — not processing — is the main wait for large files.