OGA to AU Converter
FileFlip converts OGA to AU entirely inside your browser, using FFmpeg compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an OGA file to AU?#
- Drop your OGA file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to AU and the conversion starts on its own. FileFlip downloads 30.8 MB of WebAssembly the first time and nothing after that, then runs FFmpeg on your own machine.
- Save the AU file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting OGA to AU lose quality?#
It depends on what is inside the file. OGA is a container rather than a codec, so whether the AU conversion copies the streams across untouched or re-encodes them is decided by the codecs that particular file happens to use.
Is it safe to convert OGA files online?#
Yes, because nothing is uploaded. FileFlip converts OGA files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What OGA to AU actually does to the file#
Converting OGA to AU runs on FFmpeg, downloads 30.8 MB of WebAssembly the first time and nothing after that, re-encodes or copies through depending on the codecs in the file, and drops encoded streams.
| Engine | FFmpeg |
|---|---|
| Conversion path | One step: OGA → AU |
| Downloaded to your browser | 30.8 MB, once, then cached by your browser |
| Quality | Decided by the codecs inside the file |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Encoded streams | Dropped | The target format has nowhere to put it. |
What is an OGA file?#
An OGA file is the same Ogg container as an OGG file, but under Xiph.Org's extension convention it marks audio using any codec, Vorbis, Opus, FLAC or Speex, rather than being reserved for Vorbis specifically.
Use OGA when you need an extension that correctly signals "Ogg audio" without asserting the file is specifically Vorbis.
Convert OGA to a single-codec format like MP3 or FLAC when a destination app infers the codec from the extension, since many tools still assume .oga could hold anything.
What is an AU file?#
An AU file holds audio in Sun Microsystems' Unix workstation format, a plain header followed by raw sample data that was the standard system-alert and early web audio format before WAV and MP3 took over.
AU still shows up as the format Java's javax.sound and some Unix system tools default to for short sound effects, where its simplicity is the point.
Convert AU to WAV or MP3 when the audio needs to play in modern media players, browsers, or editing software that no longer ship AU support by default.
OGA to AU questions people ask#
What's the difference between OGG and OGA?
OGA and OGG are the exact same Ogg container format; only the extension differs. Xiph.Org's convention, in use since 2007, reserves .ogg for Vorbis-encoded audio specifically and uses .oga for Ogg audio that could be any codec, including FLAC or Opus, so an .oga file makes no promise about which codec is inside.
What plays OGA files?
VLC opens OGA files on any platform regardless of which codec is inside, since it supports the full range of Ogg codecs. Players that only recognize .ogg specifically, rather than any Ogg audio, may need the file renamed to .ogg or to a codec-specific extension like .opus before they'll open it.
Can an OGA file be lossless?
Yes. Unlike a strict .ogg file, which by convention means Vorbis and is always lossy, an .oga file can hold FLAC encoded inside an Ogg container, which is lossless, alongside the more common lossy options like Vorbis, Opus or Speex.
Does converting OGA to MP3 lose quality?
It depends on the codec inside the OGA file. If it holds Vorbis, Opus or Speex, all lossy, converting to MP3 stacks a second lossy pass on top of the first and loses more detail. If it holds FLAC, which is lossless, converting to MP3 is the first and only lossy step.