Convert AAC to WMA — Free Online Converter
Convert Advanced Audio Coding (.aac) to Windows Media Audio (.wma) online for free. Fast, secure audio conversion with no watermarks or registration....
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Upload your .aac 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.
About AAC to WMA Conversion
AAC is the audio standard championed by Apple and MPEG, while WMA (Windows Media Audio) is Microsoft's competing codec introduced in 1999 as part of Windows Media. WMA was deeply integrated into Windows Media Player, Zune, and the Microsoft ecosystem throughout the 2000s. Converting AAC to WMA is necessary when targeting legacy Windows environments, Zune devices, or enterprise media systems built on Windows Media technology.
Why Convert AAC to WMA?
Some enterprise environments still run Windows Media-based infrastructure — corporate streaming servers (Windows Media Services), legacy digital signage, and older car head units with Zune/WMA support but no AAC decoder. WMA also supports DRM (Windows Media DRM) which was widely used for purchased music from Microsoft's Zune Marketplace and other Windows-based stores.
Common Use Cases
- Preparing audio for corporate environments running Windows Media streaming infrastructure
- Converting music for car stereos that support WMA but not AAC
- Creating audio for legacy Windows CE or Windows Mobile embedded devices
- Feeding audio to enterprise content management systems that require WMA format
- Building compatibility with older Windows-based media kiosks
How It Works
FFmpeg decodes the AAC stream and re-encodes using the WMA codec (wmav2 for WMA Standard, or wmalossless for WMA Lossless). WMA Standard supports bitrates from 32 to 320 kbps. The output uses the ASF (Advanced Systems Format) container with a .wma extension. WMA Pro supports multichannel audio up to 7.1 and 24-bit 96 kHz resolution.
Quality & Performance
At equivalent bitrates, AAC generally outperforms WMA in listening tests. WMA at 192 kbps is roughly comparable to AAC at 160 kbps. Since this is a lossy-to-lossy transcode, encoding at a higher WMA bitrate (192+ kbps) is recommended to minimize perceptible quality loss.
Device Compatibility
| Device | AAC | WMA |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Use 192 kbps WMA Standard for the best balance of quality and compatibility with legacy devices
- 2Choose WMA Lossless if the target system supports it and storage is not a concern — it provides CD-quality audio
- 3Test on the actual target device, as WMA codec support varies between different Windows Media Player versions
- 4For modern Windows systems, AAC in MP4 is now better supported than WMA — only use WMA when the target specifically requires it
Related Conversions
AAC to WMA bridges the Apple ecosystem with legacy Microsoft infrastructure. Use WMA at 192+ kbps for acceptable quality, and prefer WMA Pro or WMA Lossless for critical listening scenarios.