WMV to AU Converter
FileFlip converts WMV 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 a WMV file to AU?#
- Drop your WMV 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 WMV to AU lose quality?#
It depends on what is inside the file. WMV 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 WMV files online?#
Yes, because nothing is uploaded. FileFlip converts WMV 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 WMV to AU actually does to the file#
Converting WMV 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 and video tracks.
| Engine | FFmpeg |
|---|---|
| Conversion path | One step: WMV → 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. |
| Video tracks | Dropped | The target format has nowhere to put it. |
What is a WMV file?#
A WMV file holds video encoded with one of Microsoft's Windows Media Video codecs inside an ASF container, usually alongside a Windows Media Audio track, and often with Microsoft's DRM applied.
Keep a file as WMV when it is staying on Windows and feeding software that expects it, which is where the format has always worked best.
Convert WMV to MP4 to get the video off Windows, since Macs, phones, browsers and TVs will not play it as it stands.
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.
WMV to AU questions people ask#
Why won't my WMV file play on a Mac or iPhone?
WMV was never made to run outside Windows. Apple has no decoder for it, QuickTime has never opened it, and Flip4Mac, the plugin that used to bridge the gap, stopped being maintained around 2015. VLC plays WMV on macOS today because it carries its own decoders. Converting to MP4 is the fix if the file needs to work in Photos, iMovie or on an iPhone.
Does converting WMV to MP4 lose quality?
Converting WMV to MP4 re-encodes the video, so a little quality is lost. Nothing can be rewrapped here, because MP4 expects H.264 or H.265 and a WMV holds neither. Encoding at a high enough bitrate keeps the difference invisible, and given most WMV files are low bitrate to begin with there is not much detail left to protect.
What is the difference between WMV and WMA?
WMV is Microsoft's video codec and WMA is its audio counterpart, and they usually travel together, since the audio track inside a WMV file is normally WMA. Both sit in the same ASF container underneath. A .wma file holds audio on its own, which is why it plays in music apps while a .wmv needs a video player.
Why can't I play a WMV video I bought years ago?
A purchased WMV that suddenly refuses to play is almost certainly protected by Windows Media DRM, which checks a licence with a server before letting the video open. Microsoft has moved on to PlayReady and many of the stores that sold WMV content are gone, taking their licence servers with them. Files in that state cannot be converted, because the video inside is encrypted rather than merely wrapped.