AU Audio to CAF conversion is the process of transforming audio files in the AU format (a simple headered, often uncompressed or μ-law/ALAW-encoded format commonly used on Unix and legacy systems) into the Core Audio Format (CAF), Apple's flexible container that supports modern encodings, metadata, and large file sizes. This conversion repackages or re-encodes the audio so it plays correctly in applications and devices that prefer CAF while preserving sample rate, channels, and quality settings when possible.
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Read guide →Drag your .AU file from your computer or use the browse function.
Confirm .caf as the selected destination format.
Click "Convert" and download your converted .CAF file once ready.
AU files typically have the MIME type audio/basic and often use simple codecs like PCM. CAF files use the MIME type audio/x-caf and support a wide range of codecs including Apple Lossless, AAC, and PCM. CAF is commonly used in professional audio editing and Apple ecosystems due to its advanced features and extensibility.
The CAF (.CAF) format is commonly used for audio. Understanding its characteristics can be helpful when converting to or from other formats like AU Audio.
While specific technical details aren't available here, CAF files generally serve the purpose of storing audio effectively within their domain.
Effortlessly convert your AU audio files to the CAF format using our easy-to-use online converter. Designed for users seeking fast and high-quality audio format changes, our tool supports seamless AU to CAF conversion without the need for software installation.
AU files are an older audio format primarily used on Sun Microsystems systems, while CAF is a modern container format developed by Apple with support for high-quality and extensive audio data. Unlike AU, CAF offers better flexibility for storing multiple audio tracks and metadata.
Keep individual files under recommended sizes for faster uploads; aim for under 100–250 MB for single-file conversions when possible.
To preserve maximum audio quality, choose CAF with linear PCM or ALAC and match the original AU sample rate and bit depth.
For large batches, use a desktop tool or a batch-enabled service to convert multiple AU files to CAF to avoid manual re-uploads and maintain consistent settings.
Note format-specific limitations: AU headers may lack metadata and some legacy encodings (µ-law/ALAW) may require re-encoding to modern codecs when converting to CAF.
This AU to CAF converter made my audio projects so much easier to manage.
Emily R.
Musician
Quick and reliable conversion with no quality loss. Highly recommend!
James L.
Podcaster
The best online tool for converting AU files to CAF without hassle.
Sophia M.
Audio Engineer
Start your free AU to CAF conversion now.
Drag your file here to to upload.
Up to 250MB
If you need precise timestamps or non-destructive editing, prefer CAF with uncompressed PCM to avoid generation loss.