How-to · 5 min
MP3 vs MP4 for Offline Listening
Which format to pick when you're saving playlists for offline use — with concrete recommendations.
May 20, 2026
The short answer: MP3 for audio-only, MP4 when the picture matters. The longer answer depends on device, storage, and what you're actually going to do with the files.
MP3 pros: universally supported, tiny files (roughly 1 MB per minute at 128 kbps), plays on every phone and car stereo built in the last twenty years.
MP3 cons: lossy, no video, and metadata handling varies by player.
MP4 pros: keeps video, higher fidelity audio track, and modern devices index it well. Cons: much larger files, and older cars won't play it.
Concrete rules of thumb: podcasts and lectures → MP3 at 192 kbps. Music → M4A or MP3 at 320 kbps. Anything you might watch → MP4 at 720p+.