: Click the three dots (menu icon) next to the title and select "Download" .

: You can access these tracks via the "Downloads" tab in your library for up to 30 days without going online.

To get a "true" MP3 file—one you can transfer to a USB drive or play in any media software—you must use third-party desktop converters. These tools extract the audio and save it in standard formats like MP3 or AAC. YouTube Premium