How to Extract Album Cover Image from MP3 file?

I just found out that ffmpeg will do the trick!

ffmpeg -i file.mp3 file.jpg

You can use eyed3 which is a great utility for handling id3 tags. To extract all images from an mp3 file you can use:

eyeD3 --write-images=DIR mp3_file

This will write all embedded images from the mp3 file to the specified directory.

If you use the Windows version of VLC media player, you can find the album art for all files you played in

 %appdata%\VLC\art\artistalbum

by default. One folder per artist, one subfolder for each album.