What is asf video file format and how to convert asf file to mp4/avi/wmv/mov video file or mp3 audio file with iFun ASF video Coverter?

What is ASF?

ASF, now known as Advanced Systems Format, is a streaming multimedia file format

developed by Microsoft. As the main part of Microsoft Windows Media Service, ASF 

file can contain audio, video, image content and other different metadata. Since ASF 

format supports any compression and codec methods, it will ensure great flexibility. 

Moreover, ASF format is supportive of local and Internet playback, and this also makes 

it suitable for transmission and sharing over the Internet.

ASF format can be considered as an extensible file format of WMA format and WMV

format, and ASF format’s file extension is .asf.Many of you have no idea about how to 

open/play ASF files. Instead of installing many other plugins or trying different players, 

you can open ASF files by converting them to other popular video formats via ASF 

video converter.

iFunVideoConverter_48.png iFun ASF Audio & Video Converter is a free advanced ASF file converter 

that you can make use of it to convert ASF files to MP4, AVI, WMV, MOV, MP3 or 

other video/audio formats.

How to convert ASF files via iFun Video Converter

ASF to MP4

Both ASF and MP4 are video formats. The big difference between ASF and MP4 is 

that minority tools and players offer support to ASF format, on the contrary, MP4 

format is perfectly supported by almost all players, devices and platforms.

How to convert ASF to MP4? It’s quite easy. Now, use iFun Video Converter as an 

ASF to MP4 converter and follow these steps to convert ASF videos to popular MP4 

format. Open iFun Video Converter, add ASF video files to it, select MP4 as the 

output format and click “Convert” button to convert ASF format files to MP4 for 

watching on Apple, Android and any portable devices.


Since ASF format comes with small file size, it is suitable for playing online. In terms 

of AVI format, generally, it offers bigger file size but higher definition than ASF format. 

How to convert ASF to AVI without quality loss? Try iFun Video Converter. This ASF 

to AVI converter will help you convert ASF video files to AVI format quickly.


Actually, the basic internal structure of ASF and WMV is identical, and both of them 

are developed by Microsoft. The only difference is that ASF comes with .asf extension 

and video/x-ms-asf MIME type,while WMV format’s extension is .wmv and its MIME 

type is video/x-ms-wmv. iFun Video Converter supports both ASF and WMV format, 

so you can use it to convert ASF to WMV with ease.


Developed by Apple, MOV is the video file format for QuickTime Player. If you want 

to make your ASF videos workable on Mac OS, then you can take advantages of 

iFun Video Converter to convert ASF to MOV.In this way, your ASF video files can 

be played on QuickTime Player without any problem.

How to convert ASF to MP3

iFun Video Converter can also convert ASF to many other video formats, like 

FLV, 3GP, MPG, M4V, VOB and etc. In addition to video formats, you are allowed to 

convert ASF videos to audio-only files.To convert ASF to MP3, you can open iFun 

Video Converter Custom menu, go to Audio tab, find MP3 option, choose it as the 

output format for your ASF files, save changes, back to main interface and start 

converting. As you can see, iFun Video Converter supports you to convert ASF to 

WAV, AAC, OGG, WMA, M4A, AC3, FLAC and MKA audio formats as well.

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