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Convert AU to MKV

Turn AU audio into a MKV video with its cover art or a black picture – ready for YouTube.

or drag them here, or paste with Ctrl+V / ⌘V

Audio and video files · up to 10 files at once

Conversion options

PDF pages

Leave empty for all, or type e.g. 1-3, 5, 8-

Resolution
PDF document
Page size
Images per page
Image resolution in the PDF
Image
Icon sizes (px)
Video

Lower resolutions reduce file size. The video will not be enlarged.

Audio
Bitrate

Higher means better sound and a larger file. “Auto” keeps the bitrate of the original (at least 128 kbit/s); from lossless files it uses the format’s high-quality setting.

Sample rate
Channels
Cut (optional)

Times such as 1:30 or 0:45.5. Leave empty to keep the whole recording.

Picture

The video shows this picture for the whole length of the sound – for example to upload music or a podcast to YouTube.

Video size
Document
Resolution
Pages to convert

Several pages arrive as a ZIP with one image per page.

Shown by e-readers in the library; leave empty to keep what the document says.

PDF/A-2b embeds all fonts so the file looks the same in many years; required by many courts and public offices.

Scales every sheet so it fits on a single page instead of being split across several.

Sheets

CSV and TSV hold one table: with “Every sheet” each sheet becomes its own file, together in a ZIP.

Separator

Excel in many European languages expects a semicolon; most other programs a comma.

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 7 days so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Audio and video files are uploaded only after you accept and are converted on our server. The input is deleted after processing; results are kept for 7 days. Privacy details

How to use: AU to MKV

  1. 1 Click “Choose files” or drop your AU files onto the page (up to 10 at once).
  2. 2 MKV is already selected as the output; under “Options” choose the picture (cover art or black), the video size and, if you like, a start and end time.
  3. 3 Click “Convert” and confirm the upload: the video is made on our server.
  4. 4 Follow the progress – you can keep browsing meanwhile.
  5. 5 Download the MKV video when it is ready; it stays available for 7 days unless you delete it.

About this tool

AU is the simple uncompressed audio format of Sun and older Unix systems, also used by Java. MKV (Matroska) is a flexible open container that can hold several audio tracks and subtitles; popular for films and series.

Video sites such as YouTube only accept video files. This converter turns your AU sound into a MKV video that shows the file’s cover art – or a black picture when there is none – for the whole length of the sound. That is all you need to publish music, a podcast episode or a recording. Choose 720p or 1080p and, if you like, only part of the sound under “Options”. The sound itself is encoded at high quality.

Files are converted on our server: the upload starts only after you confirm, the original is deleted after conversion and the result is kept for 7 days unless you delete it sooner.

Frequently asked questions

How do I convert AU to MKV?

Choose or drop your AU file, keep MKV as the output and click Convert. After you confirm the upload, our server makes a MKV video with your sound and you download it.

What does the video show?

The cover art stored in the AU file, centred on a black background. When the file has no cover – or you choose “Black” under “Options” – the video is simply black.

Can I upload the result to YouTube?

Yes. YouTube only accepts video files, so music, podcasts and recordings have to become a video first. MP4 is the format YouTube recommends; choose 1080p for the sharpest cover picture.

Does the sound lose quality?

The sound is encoded at a high bitrate for the MKV format, so the difference is not audible in normal listening.

How long can the audio be?

Up to 10 hours and 300 MB per file; you can add up to 10 files at once.

What happens to my files?

They are uploaded only after you confirm. The original is deleted as soon as the video is made, and the MKV file is kept for 7 days unless you delete it sooner.

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