Convert MPEG-4 Audio (.m4a) to Windows Media Audio (.wma) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .m4a 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 .wma file when it's ready.
WMA (Windows Media Audio) is Microsoft's proprietary audio codec developed as a competitor to MP3 in 1999. Converting M4A to WMA moves audio from Apple's ecosystem to Microsoft's. This is relevant for older Windows devices, Zune media players, certain car stereos, and DLNA media servers that prefer WMA. The conversion re-encodes AAC or ALAC audio to WMA inside Microsoft's ASF container.
Some car stereos from the mid-2000s to early 2010s support WMA and MP3 but not AAC/M4A. Microsoft's Zune ecosystem and older Windows Media Center installations prefer WMA. DLNA media servers may transcode M4A to WMA for certain client devices. Enterprise media systems standardized on Microsoft formats may require WMA input.
FFmpeg decodes the M4A audio (AAC or ALAC) to PCM and encodes using wmav2 inside an ASF container with .wma extension. WMA v2 supports 32-320 kbps at sample rates up to 48 kHz. WMA Pro supports higher bitrates and multichannel, but has limited device support. WMA Lossless is also available for bit-perfect conversion from ALAC M4A.
WMA at 192 kbps is comparable to MP3 at 192 kbps. At 256+ kbps, quality is very good. Converting from lossy AAC M4A to lossy WMA introduces generational loss — use the highest practical bitrate to minimize degradation. From ALAC M4A, a single generation of WMA compression applies.
| Device | M4A | WMA |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| 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
M4A to WMA bridges the gap between Apple and legacy Microsoft ecosystems. Use the highest available bitrate and consider whether MP3 might serve the same purpose with broader compatibility.
安全传输
HTTPS 加密上传
隐私优先
文件处理后自动删除
无需注册
即刻开始转换
随处可用
任何浏览器，任何设备
| No |
| 特性 | M4A | WMA |
|---|---|---|
| 全称 | MPEG-4 Audio | Windows Media Audio |
| 扩展名 | .m4a | .wma |
| 最适合 | Better than MP3 | Windows native |