Convert WMV to ALAC — Free Online Converter

WMV files carry audio encoded as WMA (Windows Media Audio) — a Microsoft-proprietary codec that Apple devices cannot play natively. ALAC (Apple Lossless Audio Codec) is Apple's lossless compression standard, open-sourced in 2011, delivering roughly 50% compression of PCM audio with guaranteed bit-perfect reconstruction. Converting WMV to ALAC extracts the audio from Microsoft's format and compresses it losslessly in Apple's ecosystem-native codec, stored in an M4A container compatible with every Apple device.

ALAC is the default lossless audio format for Apple Music, iTunes, iPhone, iPad, HomePod, and AirPlay 2. If you have WMV recordings with audio you want to preserve in lossless quality for the Apple ecosystem, ALAC provides bit-perfect audio in a format that syncs naturally to iCloud Music Library and plays on every Apple product without third-party apps.

FFmpeg decodes the WMA audio stream from the ASF container to raw PCM, then encodes to ALAC using the native ALAC encoder. The output is stored in an M4A container (MPEG-4 Part 14 audio). Sample rate (44.1/48 kHz), bit depth (16/24-bit), and channel layout are preserved. ALAC's lossless compression typically achieves 40–60% size reduction compared to raw PCM, depending on audio complexity.