Winamp supports playback of Windows Media Video and Nullsoft Streaming Video. The standard version limits maximum burn speed and datarate ('Pro' version removes these limitations). CD support includes playing and importing music from audio CDs, optionally with CD-Text, and burning music to CDs. It supports gapless playback for MP3 and AAC and ReplayGain for volume leveling across tracks. Winamp was one of the first widely used music players on Windows to support playback of Ogg Vorbis by default.

Winamp supports music playback using MP3, MIDI, MOD, MPEG-1 audio layers 1 and 2, AAC, M4A, FLAC, WAV, and WMA. This acquisition allowed the Winamp SA to access a much larger audience and offer users a new experience. On January 17, 2014, Radionomy, one of the largest platforms for producers and broadcasters and the world's largest digital media advertising network, announced that it had acquired the rights to the Winamp player and the Shoutcast internet radio platform. In June 1999, Winamp was sold to AOL, which continued to develop the program until December 2013. Unfortunately, the original Nullsoft development team no longer exists. After court disputes and the conclusion of an out-of-court agreement, Nullsoft stopped using it and implemented an ISO decoder from the Fraunhofer Society (Fraunhofer Gesellschaft), the creators of the MP3 format.

In later versions, it was replaced by Nitrane, a licensed decoder created by Nullsoft or PlayMedia (there were ongoing court disputes as to the owner of the rights to the product).

Originally, MP3 playback was based on the AMP decoding engine developed by Tomislav Uzelac (PlayMedia Systems, Inc.). Winamp is a media player originally developed by Justin Frankel and Dmitry Boldyrev by their company Nullsoft.

Winamp pro full version