Convert Advanced Systems Format (.asf) to Windows Media Audio (.wma) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .asf 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 the audio codec commonly found inside ASF containers, but WMA can also exist as a standalone .wma file. Converting ASF to WMA is primarily an extraction operation — pulling the WMA audio stream out of the ASF video container into its own dedicated audio file. This is useful when the ASF contains both video and audio, but you only need the audio track.
ASF is a container designed for streaming video and audio together. If you only want the audio (a soundtrack, voiceover, or music track), extracting it to a standalone WMA file saves significant disk space by discarding the video data. The resulting WMA file plays in Windows Media Player, Groove Music, and other Windows audio applications without video player overhead.
If the ASF already contains a WMA stream, extraction can often be done by stream copying (remuxing) without re-encoding — a nearly instant operation that preserves quality perfectly. If the audio is WMA Pro or WMA Lossless and you want standard WMA v2 output, transcoding is performed. The output .wma file is technically a minimal ASF container with only the audio stream.
Stream-copied WMA is bit-identical to the original audio in the ASF — zero quality loss. If transcoding from WMA Pro or Lossless to standard WMA is required, there is some quality reduction typical of lossy encoding. Standard WMA at 192 kbps provides good quality for music.
| Device | ASF | WMA |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
ASF to WMA extraction is a quick, practical operation that isolates the audio content from ASF video files, keeping it in the native Windows Media Audio format for Windows ecosystem use.
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8MB free, 50MB Nitro
Alle nettlesere, alle enheter
| Egenskap | ASF | WMA |
|---|---|---|
| Fullt navn | Advanced Systems Format | Windows Media Audio |
| Filendelse | .asf | .wma |
| Best egnet for | Streaming optimized | Windows native |