OFFICIAL PAGE: Splitter
Splitter is a web-based service for Deezer Research's Spleeter application. It allows you to upload a source file, which will be separated into 2 stems (Instrumental + Acapella) or 5 stems (Drums, Bassline, Piano, Other, Vocals). The service accepts WAV, MP3, OGG, M4A, WMA and FLAC files, 0.5 MB to 50MB, up to 20 minutes. You have a choice of the original 11KHz cutoff frequency or a new 16KHz cutoff frequency. The service's basic functionality is currently offered free of charge.
Screenshot courtesy of Splitter.ai