100% local
AUDIO

Convert AU
to MKV

Right-sized output for the use case.

Converting from AU to MKV aligns the file with the encoding choices the downstream pipeline expects. The result is a deliverable that fits naturally into the destination workflow.

— Drop area

WHY CONVERT

Why convert AU to MKV

01

Right-sized output for the use case

Converting from AU to MKV aligns the file with the encoding choices the downstream pipeline expects. The result is a deliverable that fits naturally into the destination workflow.

02

Acceptance by downstream tools

MKV is the format most receiving systems expect for this kind of content. Converting upstream avoids the rejection and silent re-encoding that often happen when AU reaches an unprepared pipeline.

03

Lower storage and bandwidth cost

MKV files are typically smaller than their AU counterparts, which reduces hosting, transfer, and storage costs at scale. The savings compound when serving the same content to many recipients.

— How to convert

AU to MKV in three steps.

  1. 01

    Open LocalConvert

    Visit this page on any modern browser — no install, no signup, no plugin.

  2. 02

    Drop or select your AU file

    Drag your AU into the drop area, or click to pick one from your device.

  3. 03

    Click Convert

    Conversion runs entirely in your browser. When it's done, your MKV file downloads to your device.

QUALITY & FIDELITY

Quality and fidelity

  • Lossy source to lossless target: existing artifacts are preserved but no new loss is added.
  • Metadata (EXIF/tags) is preserved where the source provides it.
Transparency AU ✗ MKV ✗
Color depth unknown any (container)
Metadata preserved ✓

FORMAT SPECS

Format specifications

MKV
Extensions.mkv .mka .mks
MIME typesvideo/x-matroska
Introduced2002
MaintainerMatroska / CELLAR (IETF)
Magic #1A 45 DF A3
SpecView spec ↗

COMPATIBILITY

Where these formats work

MKV

Windows
Native
macOS
App
iOS
App
Android
App
Chrome
—
Firefox
—
Safari
—
Edge
—

Why LocalConvert

How LocalConvert compares

CategoryLocalConvertCloud converters
PRIVACYFiles never leave your device. The whole pipeline runs in your browser via WebAssembly.Files travel to a remote server, sit in queue storage, and may be retained for analytics or moderation.
COSTFree, no signup, no daily quotas.Often free for small files; paid tiers for batch / large / commercial use.
LIMITSLimited only by your device's memory and CPU. Uncompressed WAV stems handled comfortably on desktop.Typical 100 MB to 1 GB per-file caps, plus rate limits.
— The formats
From · AU

AU

AU is a file format supported by LocalConvert.

To · MKV

Matroska Video

An open, flexible container that can hold virtually any video, audio, and subtitle codec.

Typical uses
Movie archives, multi-language releases, home media.

— FAQ

Frequently asked.

Is AU to MKV conversion free?

Yes. LocalConvert is completely free, with no signup and no per-file or per-day limits.

Do my files get uploaded anywhere?

No. AU to MKV conversion happens entirely inside your browser using WebAssembly — your file never leaves your device.

What's the maximum file size?

There's no fixed cap — the practical limit is your device's available memory. Very large files may take longer or fail on low-RAM devices.

Does it work offline?

Yes — once the page has loaded, AU to MKV conversion works without an internet connection. Re-open the page once to cache it.

Will conversion preserve quality?

LocalConvert uses the industry-standard tools (FFmpeg, ImageMagick, Pandoc) — quality matches what professionals use on the command line. Lossy formats will still lose some quality on each re-encode.

— Related

Or convert these.

AU 3G2AU 3GPAU AACAU AC3AU AIFAU AIFC
Browse all conversions
REFERENCES

Format references

MKV

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100% local conversion.

AU to MKV is processed in your browser with WebAssembly. No upload, no tracking, no limits. Your file never leaves your device.