.asf Advanced Systems Format
ASF Converter
ASF is the Microsoft container behind WMV and WMA files, sometimes produced by CCTV DVRs and older cameras.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Working…
Keep this tab open — the conversion runs on your device, nothing is uploaded.
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✓ Done — your files are saved to Downloads
Add more files above to keep converting.
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ASF at a glance
| Full name | Advanced Systems Format |
|---|---|
| Type | Video |
| Compression | Lossy (compressed) |
| Developed by | Microsoft |
| Introduced | 1996 |
| File extension | .asf |
| Plays on iPhone | ✕ No |
| Plays on Android | ✕ No |
| Plays on Windows | ✓ Yes |
| Plays on Mac | ✕ No |
ASF is best for CCTV recorders and Windows media.
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Frequently asked questions
What is a .asf file?
ASF is the Microsoft container behind WMV and WMA files, sometimes produced by CCTV DVRs and older cameras.
How do I open a ASF file?
VLC Media Player opens most .asf files on Windows, Mac, Android and iPhone. If your phone's gallery or a website rejects it, convert it to MP4 above. MP4 is the format every device and app accepts.
Can I convert ASF for free?
Yes. The converter on this page is free and unlimited, and it works without uploading anything.