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MP4 to AU Converter

Convert MP4 files to AU online for free. Upload one file or many and download the AU results one by one or all together in a ZIP. No sign-up needed.

convert
MP4
MP3WAVAACFLACOGGOGAM4AM4BWMAAIFFAIFCOPUSAC3ALACCAFVOCWEBAAMRAPEDSSSHN
MP4M4VMOVMKVWEBMAVIFLVWMVMPEGMPGMODVOB3GP3GPP3G2OGVTSMTSM2TSMXFDVRMRMVBSWFWTVCAVSDVR

No format found

to
AU
MP3WAVAACFLACOGGOGAM4AM4BWMAAIFFAIFCOPUSAC3ALACAUCAFVOCWEBAAMR
GIFWEBP
M4VMOVMKVWEBMAVIFLVWMVMPEGMPGMODVOB3GP3GPP3G2OGVTSMTSM2TSMXFDVRMRMVBSWFWTVGIFCAVSDVR

No format found

Drop your MP4 files here
or click to choose MP4 files · up to 95MB each

How to convert MP4 to AU

  1. Choose your files. Click Select File or drag your MP4 files into the upload box. You can add many at once.
  2. Pick the settings. AU is already selected as the output format. The conversion starts as soon as a file is added.
  3. Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.

MP4 – MPEG-4 Part 14

MP4 is the most widely supported video container. It usually holds H.264 or H.265 video with AAC audio and plays on nearly every phone, computer, TV and browser.

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AU – Sun Audio

AU is a simple audio format introduced by Sun Microsystems, still found on Unix systems and in Java applications.

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Converting MP4 to AU

Frequently asked questions

How do I convert MP4 to AU?

Click Select File or drop your MP4 file onto the upload box. The converted AU appears in the list below with a download button. You can add many files at once and download them together as a ZIP.

Is it really free?

Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.

Are my files stored?

Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.

Will quality drop?

For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.

Related converters

How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.