AU
→
CAF

Convert AU to CAF Online

Convert AU to CAF online. Start with free daily conversions, no install, no watermarks, and visible job status.

AU to CAF Converter

Upload your AU file to convert it to CAF format

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How to Convert AU to CAF

Follow these simple steps

1

Step 1: Upload Your File

Upload your AU file by dragging and dropping or clicking to browse

2

Step 2: Select Output Format

CAF is automatically selected as the output format

3

Step 3: Start Conversion

Click the Convert button to start the conversion

4

Step 4: Download Result

Download your converted CAF file when ready

Convert AU to CAF - Complete Guide

Converting AU to CAF stays in the audio file family but changes the traits that decide size, quality, transparency, editability, or device support. AU is a audio format. Sun audio. CAF is a audio format. Core Audio Format. Below is what actually changes in a AU→CAF conversion, what is preserved, and when CAF is the better choice than keeping AU.

What changes when you convert AU to CAF

  • The audio is re-encoded into the CAF format. Because re-encoding is not free, start from the highest-quality source you have and keep quality settings high.
  • Expect a larger output file: CAF stores AU content with less aggressive compression.

About the AU format

AU is a audio format. Sun audio.

  • Compression: mixed
  • Opens with: VLC, Audacity, FFmpeg

Where AU is strong: simple legacy format from Sun/NeXT systems; stores uncompressed PCM or companded mu-law/A-law audio; easy to read and parse.

Typical AU uses: legacy Unix and Java system sounds, older audio archives.

About the CAF format

CAF (Core Audio Format) is Apple's flexible audio container that supports various audio codecs and features like unlimited file size.

  • Full name: Core Audio Format
  • Developer: Apple
  • Compression: mixed
  • Opens with: Logic Pro, GarageBand, QuickTime, FFmpeg

Where CAF is strong: Apple container that holds very large or long recordings; supports many codecs including uncompressed PCM; no practical file-size limit unlike WAV.

Typical CAF uses: macOS and iOS audio production, long-form recordings beyond WAV limits, Logic Pro and Core Audio workflows.

What CAF keeps

  • CAF adds: Apple container that holds very large or long recordings.

Things to watch out for

  • One CAF limitation to keep in mind: mainly used within Apple software.

When to convert AU to CAF

  • Convert AU to CAF for macOS and iOS audio production.
  • Convert AU to CAF for long-form recordings beyond WAV limits.
  • Convert AU to CAF for Logic Pro and Core Audio workflows.

AU vs CAF — format comparison

A quick side-by-side of the structural differences between AU and CAF, so you can confirm this is the right conversion for your file:

AttributeAUCAF
TypeAudio fileAudio file
CompressionFlexible (lossy or lossless)Flexible (lossy or lossless)
Web-friendlyNoNo
Typical file sizeMediumLarge
Best forlegacy Unix and Java system soundsmacOS and iOS audio production

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Need the opposite conversion?

Convert CAF to AU

Other AU Conversions

More formats you can convert AU to

Convert AU to MP3Convert AU to WAVConvert AU to AACConvert AU to OGGConvert AU to FLACConvert AU to M4AConvert AU to WMAConvert AU to AIFFConvert AU to OPUSConvert AU to AC3Convert AU to AMRConvert AU to MKAConvert AU to WVConvert AU to SPXConvert AU to OGAConvert AU to DTSConvert AU to MP2
View all AU conversions →

Convert to CAF

Other formats you can convert to CAF

Convert MP3 to CAFConvert WAV to CAFConvert AAC to CAFConvert OGG to CAFConvert FLAC to CAFConvert M4A to CAFConvert WMA to CAFConvert AIFF to CAFConvert OPUS to CAFConvert AC3 to CAFConvert AMR to CAFConvert MKA to CAFConvert WV to CAFConvert SPX to CAFConvert OGA to CAFConvert DTS to CAFConvert MP2 to CAF
View all CAF conversions →

AU to CAF FAQ

Converting AU to CAF preserves the content faithfully; output also depends on the source file and any settings you choose.
Upload your AU file, confirm CAF as the output format, and click Convert. Job status is shown while the file is processed, then you can download the CAF result.
Yes. You can start with free daily conversions, with no signup required for your first jobs and no watermarks on the output. Accounts and paid plans are available for higher-volume work.
No. The AU to CAF conversion runs in your browser on any device — Windows, Mac, Linux, iOS, or Android — with uploads and downloads over HTTPS.
CAF (Core Audio Format) is an audio file format. CAF files can be played with various audio players and media applications.
Upload your CAF audio file to the converter, select your desired output format, and click Convert. The job status appears while the audio is processed.
You can start with free daily conversions. Accounts and paid plans are available for higher-volume work, and downloaded files are not watermarked.
You can convert CAF to proof-backed audio outputs such as MP3, WAV, AAC, OGG, FLAC, M4A, WMA, AIFF, OPUS, AC3, AMR, AU, CAF, MKA, WV, SPX, OGA, DTS, and MP2 when the source format is public-supported.
Yes! Our CAF converter works on any device including smartphones and tablets.
Choose the bitrate or output setting that fits your file-size and playback needs. Lossy formats can reduce detail compared with the source.

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