Convert Windows Media Audio (.wma) to MPEG-4 Audio (.m4a) 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 format, once the default for Windows Media Player and Zune. M4A (MPEG-4 Audio) is Apple's audio container based on the ISO base media file format, typically holding AAC-encoded audio. M4A is the native format for iTunes, Apple Music, iPhone Voice Memos, and the entire Apple ecosystem.
Converting WMA to M4A moves your audio from a Windows-centric format to the universally supported Apple standard. M4A/AAC provides better audio quality than WMA Standard at equivalent bitrates and enjoys native playback on virtually every modern device.
WMA playback on Apple devices requires third-party apps — neither iTunes, Apple Music, nor the native iOS Music app support WMA natively. M4A is the native format that plays everywhere in the Apple ecosystem with hardware-accelerated decoding. Converting WMA to M4A/AAC also typically improves audio quality at the same file size.
M4A's container supports richer metadata than WMA's ASF format, including embedded album art, lyrics, chapter markers, and iTunes-specific tags like media kind, grouping, and show/episode information. For anyone building a well-organized music or podcast library, M4A is the superior container.
FFmpeg decodes the WMA stream from its ASF container to PCM, then encodes using the AAC encoder into an M4A (MPEG-4 Part 14) container. The M4A wrapper includes ftyp, moov, and mdat atoms. Metadata from ASF attributes is mapped to MP4 atom tags for iTunes compatibility. For lossless conversion, ALAC can be specified as the codec within the same M4A container. The default output is AAC-LC at the specified bitrate.
AAC in M4A produces better quality than WMA Standard at equivalent bitrates — particularly noticeable below 128 kbps. However, transcoding from WMA to AAC introduces generation loss since both are lossy. Encoding AAC at a slightly higher bitrate than the WMA source (e.g., 192 kbps AAC from 128 kbps WMA) absorbs the transcoding artifacts effectively.
| Device | WMA | M4A |
|---|---|---|
| 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 M4A converts Microsoft audio to the Apple ecosystem standard with improved codec quality and richer metadata. Encode AAC at a bitrate matching or exceeding the WMA source.
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| No |
| Funktion | WMA | M4A |
|---|---|---|
| Fullstandigt namn | Windows Media Audio | MPEG-4 Audio |
| Filandelse | .wma | .m4a |
| Bast for | Windows native | Better than MP3 |