When you like a song on Spotify and download it to listen to offline, how does Spotify do so well compressing it into a local file on your phone? The file size is nowhere near comparable to the actual mp3 file.
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> how does Spotify do so well compressing it into a local file on your phone? The file size is nowhere near comparable to the actual mp3 file.
I did a quick test in Spotify and my download usage came out at around 4 meg per song, which is exactly the same as mp3 files with normal quality / compression level.
You might be thinking of maxium quality mp3 files, which are bigger?
Also the audio format Spotify uses is AAC, which is newer and that bit better quality than mp3. It’s the same audio format used by iTunes and by the MP4 video format.
Basically Spotify downloads (and any AAC files) are the same size as normal quality mp3s but sound like higher quality (bigger) mp3 files because AAC is a newer and better compression format.
Spotify sacrifices sound quality for compression. Their songs are compressed to 96kbps or 160kbps, with 320 available to premium users. For comparison, lossless audio from a recording studio is 1,411kbps
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