Convert MP3 to ALAC — Free Online Converter

ALAC (Apple Lossless Audio Codec) is Apple's lossless compression format — it reduces file size by 40-60% compared to uncompressed AIFF or WAV while preserving bit-for-bit identical audio upon decoding. Apple uses ALAC for its Lossless Audio streaming tier on Apple Music, and every Apple device from iPhone to HomePod plays ALAC natively without third-party software. Converting MP3 to ALAC is ideal for Apple ecosystem users who want to archive their MP3 library in a lossless container.

The important caveat is that MP3 is already a lossy format. Converting MP3 to ALAC preserves the decoded MP3 audio losslessly — no additional quality is lost — but the resulting ALAC file cannot contain more audio information than the MP3 source contained. The value of this conversion is in having a lossless working copy that can be transcoded to any other format in the future without cumulative quality degradation.

ALAC is the only lossless format natively supported across all Apple devices — iPhone, iPad, Mac, Apple TV, HomePod, Apple Watch, and AirPods Max. If your audio library lives in Apple Music or iTunes, ALAC integrates seamlessly with iCloud Music Library and all Apple services. FLAC, while more universal, requires third-party apps on iOS and macOS for playback.

Converting MP3 to ALAC also makes sense as a format preservation strategy. If you are archiving a large MP3 collection, storing lossless ALAC copies ensures you never accumulate additional compression artifacts from future format conversions. Need to go from ALAC to AAC later? The transcoding starts from a lossless source rather than a lossy-to-lossy chain. The ALAC files will be larger than the original MP3s but significantly smaller than uncompressed WAV or AIFF equivalents.