Convert Windows Media Audio (.wma) to Apple Lossless Audio Codec (.alac) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .wma file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
WMA is Microsoft's proprietary audio codec family — WMA Standard for lossy compression, WMA Pro for multichannel, and WMA Lossless for bit-perfect audio. ALAC (Apple Lossless Audio Codec), open-sourced by Apple in 2011, provides lossless compression within the M4A container and plays natively on every Apple device. ALAC typically achieves 40-60% compression compared to raw PCM.
Converting WMA to ALAC decodes the WMA audio to PCM and re-encodes it losslessly with ALAC. For WMA Standard sources, this preserves the decoded quality in a lossless container suitable for the Apple ecosystem. For WMA Lossless sources, the conversion produces a true lossless-to-lossless transfer.
If you are migrating from a Windows-based music library to Apple devices, ALAC is the ideal target format. Unlike FLAC, ALAC plays natively on iPhone, iPad, Mac, Apple Watch, HomePod, and AirPods Max with hardware-accelerated decoding. Apple Music uses ALAC for its Lossless tier. The M4A container supports rich metadata including album art, lyrics, and chapter markers.
For WMA Lossless collections specifically, converting to ALAC preserves bit-perfect quality while gaining Apple ecosystem compatibility. Both codecs are lossless, so no quality is lost in the transfer. The resulting files play everywhere Apple hardware is used.
FFmpeg demuxes the ASF container, decodes WMA audio to PCM, and re-encodes using the ALAC encoder (-c:a alac) into an M4A container. For WMA Lossless sources, the decoded PCM is bit-perfect, making the entire pipeline lossless. For WMA Standard sources, the decoded PCM reflects the lossy WMA quality, which ALAC then preserves exactly. The output inherits the source sample rate and bit depth. Metadata from ASF tags is mapped to MP4 atom tags for iTunes compatibility.
ALAC encoding is lossless — it preserves every decoded sample from the WMA source. For WMA Standard inputs (lossy), the ALAC output perfectly captures what WMA preserved, artifacts included. For WMA Lossless inputs, the conversion is end-to-end lossless — the ALAC output is bit-for-bit equivalent to the original pre-compression audio. The ALAC files are larger than WMA Standard but smaller than uncompressed WAV.
| Device | WMA | ALAC |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
WMA to ALAC is the cleanest migration path from Windows Media to the Apple ecosystem. WMA Lossless sources convert with zero quality loss, while WMA Standard sources are preserved at their decoded quality.
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| No |
| Funktion | WMA | ALAC |
|---|---|---|
| Fulde navn | Windows Media Audio | Apple Lossless Audio Codec |
| Filendelse | .wma | .m4a |
| Bedst til | Windows native | Lossless |