We support a huge range of formats in our Song Slower tool. It can be MP3, OPUS, WAV, MMF, AAC, M4A, FLAC, OGG, M4R, AIFF, WMA etc. Also, we return the changed track in the same format as your uploaded track. For example, if the format you upload your audio in is WAV, the altered audio will also be in WAV format. Nevertheless, the default format is usually MP3. In case you intend to change the format of the audio, you could use our free online Audio Converter tools to change the track into the format you desire. Another huge plus point of our Song Slower is that, since it supports all the audio formats, you can play any audio using our site. Even an audio that does not work in your mobile phone.