AU Audio to RA conversion is the process of re-encoding audio stored in the AU format — a simple, header-based audio container commonly used on Sun/Unix systems and some legacy applications — into the RealAudio (RA) format, which is a compressed streaming-oriented format developed by RealNetworks. This conversion changes the container and compression method so the file can be played or streamed by players that support RA while attempting to preserve audio fidelity and timing.
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Read guide →Drag your .AU file from your computer or use the browse function.
Confirm .ra as the selected destination format.
Click "Convert" and download your converted .RA file once ready.
AU files use the MIME type audio/basic or audio/ulaw and typically contain uncompressed or µ-law encoded audio data. RA files use the MIME type audio/vnd.rn-realaudio and rely on RealAudio codecs optimized for streaming. AU is common in legacy UNIX audio applications while RA is favored for online streaming and multimedia content delivery.
The RA (.RA) 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, RA files generally serve the purpose of storing audio effectively within their domain.
Convert your AU Audio files to RA format effortlessly with our online AU to RA converter. Whether you need RA files for streaming or compatibility, our tool ensures a seamless and fast conversion process without any software installation.
AU Audio files are typically used on UNIX systems and store raw audio data, which can be large and less compressed. In contrast, RA files are designed for streaming and use advanced codecs to reduce file size while maintaining sound quality. RA format is more widely supported for online media distribution, making it preferable for sharing audio content.
Keep individual AU source files under 100–250 MB for faster browser-based conversion; larger files are best handled via desktop tools or a premium service.
To preserve quality, avoid multiple lossy re-encodes: export from the original source to RA once and choose a higher bitrate or lossless intermediary if available.
For batch conversions, use a dedicated desktop app or a converter that supports queuing to maintain consistent settings across files.
Note format limitations: AU often contains raw PCM or µ-law samples while RA is a lossy, streaming-oriented codec, so some quality loss is normal when moving to RA.
The AU to RA converter saved me hours of work with batch processing.
James M.
Audio Engineer
Easy to use and reliable—perfect for preparing my episodes.
Linda K.
Podcaster
Fast conversion speeds and excellent audio quality every time.
Mark S.
Web Developer
Start your free AU to RA conversion now.
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Up to 250MB
If preserving exact sample rates or bit depth is critical (archival use), consider keeping a PCM copy (WAV/FLAC) before converting to RA.