1. A computer

2. Qianqianjingting (now renamed Baidu Music)

Steps

1 , install Qianqianjingting on your computer, then open it, and add the audio you want to add a cover to the playlist.

2. Right-click the successfully added local music and select the "View Song Information" option to open the song information editing window. Here you can see the "Change Album Cover" button.

3. Prepare a square picture as the album cover. The size is about 300*300. Then save it on the desktop, click the "Change Album Cover" button, select the album cover picture you just saved and open it.