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Audio Conversion

Convert AU to M4A Online — Free

Fast, free AU to M4A converter. No registration required.

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2M+ Dateien konvertiert

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Sofort mit der Konvertierung beginnen

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Jeder Browser, jedes Gerät

So konvertieren Sie

1

Upload your .au file by dragging it into the upload area or clicking to browse.

2

Choose your output settings. The default settings work great for most files.

3

Click Convert and download your .m4a file when it's ready.

Was ist AU?

AU is an audio format created by Sun Microsystems. It's one of the oldest digital audio formats, commonly used on Unix and Java platforms.

Formatdetails

Vollständiger Name
Sun Microsystems Audio
Erweiterung
.au

Hauptmerkmale

  • Unix standard
  • Java audio
  • Simple format
  • Legacy support

Was ist M4A?

M4A is an audio-only MPEG-4 container, commonly using AAC encoding. It provides better quality than MP3 at similar file sizes.

Formatdetails

Vollständiger Name
MPEG-4 Audio
Erweiterung
.m4a

Hauptmerkmale

  • Better than MP3
  • Apple ecosystem
  • AAC encoding
  • Metadata support

AU vs. M4A

MerkmalAUM4A
Vollständiger NameSun Microsystems AudioMPEG-4 Audio
Erweiterung.au.m4a
Am besten fürUnix standardBetter than MP3

Häufig gestellte Fragen

Converting between lossless formats preserves perfect quality. When converting to lossy formats, our optimized encoding minimizes any audible difference. You can adjust bitrate to control quality vs. file size.
We preserve ID3 tags, album art, and metadata when both AU and M4A support them. Some metadata may not transfer between incompatible formats.
Pro users can batch convert multiple audio files simultaneously. Free users convert one file at a time with up to 5 free conversions per day.
We support all standard sample rates from 8kHz (voice) up to 192kHz (studio quality). The default preserves your source file's sample rate.
Yes. Our audio converter handles music, podcasts, voice memos, and audiobook files. For podcasts, we recommend MP3 at 128-192kbps for the best balance of quality and file size.

Verwandte Konvertierungen

AU to MP3AU to WAVAU to FLACAU to OGGAU to AACAU to WMAAU to AIFFAU to Opus