MP3 means MPEG-1 Audio Layer 3 and never equals to MPEG-3 as it looks. MP3 is a widely used format in internet since 1995 and almost becomes the representative name of online music. Shortly, MP3 is an audio compression technology which compresses music to a small file (usually 3-4 MB for each song in MP3 format) with high compression rate and little loss on sound quality. Owing to its unprecedented population and wide hardware or software support, MP3 is surely hardly replaced by other formats in a short while.

ASF is Advanced Streaming Format. It is an extensible file format developed primarily for storing synchronized digital video, audio, subtitle streams, or transmitting data on the internet. ASF is also a multimedia container of Windows Media Video or Windows Media Audio.

Windows has bundled a free MP3 decoder,  ASF Converter can convert mp3 to asf directly. If professional Fraunhofer IIS MP3 codec is installed, MP3 sound quality will be improved.


Download ASF Converter which can convert mp3 to asf file. Select an mp3 file, change audio encoding bitrate if necessary,  rename the output file to asf extension.

AMR means Adaptive Multi-Rate. AMR is an audio mainly applied to mobile devices. With relatively high compression rate, it makes good effect in voice call. AMR ringtone format is one of the universal file format adopted by MMS ,which could not only be used to create music files but also produce some audio works like funny voice, animalsí voice, etc. Besides, AMR is declared as the most widely used voice standards in mobile communication system by the European Telecommunications Standardization Committee. AMR also has been selected as the broadband standard speech codec of the 3GWCDMA and GSM by 3GPP (3rd Generation Partnership Project).

To convert amr to asf, please install its decoder.

AWB format is called True Tones. AWB is firstly adopted in NOKIA3300 in the form of ringtones and it is said to be able to simulate natural sound effectively by NOKIA. AWB is affirmative that its size is quite small with a 4-minute-long song only taking up 600 to 700KB, thus AWB may be said to be the upgrade of AMR. But actually AWB is less able to restore the natural music than some other formats sound do like MMF, MP3 and so on.

To convert awb to asf, please install its codec or HDX4 player.

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