ASF to MP3 converter
Convert ASF to MP3 in your browser. No upload and no account: the file never leaves your device, so the only size limit is your device’s memory.
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Every request this page makes is listed as it happens. You’ll see our own code loading, and for some formats a codec engine, but never your file going out.
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Check it yourself: open your browser’s developer tools on the Network tab, or turn off Wi-Fi once the page has loaded. The tools keep working.
Related conversions
Convert other formats to MP3
Read more about the ASF format and the MP3 format, or see every video tool and all video conversions.
Should you convert ASF to MP3?
Yes, when you only need the sound: a song from a music video, the audio of a lecture, or a voice recording to transcribe. The picture is left out and the soundtrack is saved as MP3.
ASF is Microsoft’s streaming container, found on old CCTV recorders and Windows Media streams; MP3 is the most compatible lossy audio format ever made. Use MP3 when you don’t know what will play the file: cars, old players, podcasts hosts and upload forms all take it.
| Property | ASF | MP3 |
|---|---|---|
| What it is | Microsoft’s streaming container, found on old CCTV recorders and Windows Media streams | The most compatible lossy audio format ever made |
| Audio inside | Windows Media or MPEG-4 video with WMA audio | 128–320 kbps |
| Plays on | Windows Media Player and VLC | Every phone, computer, car stereo, speaker and app |
| Best for | Old Windows Media streams and security camera exports | Music and voice that has to play on anything |
How to convert ASF to MP3
- 01
Add your ASF
Drop your ASF video onto the box, or click to choose it. It is read from your disk and stays there.
- 02
Check the settings
The output is already set to MP3. Change the bitrate if you want to; the defaults suit most files.
- 03
Save the MP3
Press convert and save the MP3. Several files come back together as a ZIP.
What changes when ASF becomes MP3
From WMA to MP3
ASF soundtracks are usually WMA, so saving MP3 is one more lossy step. 192 kbps suits music, 128 kbps is plenty for speech, and going above the original bitrate only makes the file bigger.
Video files without sound
Screen recordings and some exported clips have no audio track at all. The file is checked as soon as you add it, and you’ll be told before converting if there’s nothing to extract.
This page is put together from our notes on each format, choosing only what is true of ASF and MP3, so every pairing states the same facts the same way. How these pages are made.
Why it doesn’t upload
Uploading a whole video to keep only its sound wastes time and data, and hands over the footage too. The audio track is read and saved right here, and the file never leaves your device.
How to check for yourselfWorth knowing
- About the ASF. CCTV systems often export ASF with timestamps that confuse players, so a recording seems to jump; re-encoding fixes the timing.
- About the MP3. Converting a low-bitrate MP3 to 320 kbps makes it bigger without making it sound any better; what was thrown away is gone.
- AVI, WMV, FLV and other older formats use the FFmpeg engine, a one-time 31 MB download.
Questions
Does extracting MP3 from an ASF lose quality?
The soundtrack is compressed again as MP3. At 192 kbps the difference from the original is inaudible for nearly everyone.
Can I get the audio from only part of the video?
Yes. Set a start and end time before converting, and only that section is saved as MP3.
Read more about this
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