MPG vs. MP4: Which Video Format Saves More Space & Quality?
MPG (also called MPEG-1 or MPEG-2) is an older video container/compression format; MP4 is a modern container that uses newer MPEG-4 codecs like H.264 or H.265.
People blur MPG and MP4 because both begin with “MP” and play on almost any device; file-explorer icons look alike, so many assume they’re just “quality settings” rather than entirely different technologies.
Key Differences
MPG relies on MPEG-1/2 codecs, producing larger files with softer detail. MP4 uses H.264/H.265, shrinking file size 50–70 % at the same resolution while keeping sharper image and multi-track audio.
Which One Should You Choose?
Archive old DVDs or legacy broadcast? Stick with MPG. Shooting phone video, sharing on YouTube, or backing up to cloud? MP4 saves space and keeps quality, so choose MP4.
Can I rename .mpg to .mp4?
No—renaming only changes the label, not the codec inside. Transcode with a tool like HandBrake.
Will MPG ever look better than MP4?
Rarely. Only if the MP4 uses a very low bitrate; otherwise MP4’s modern codec wins on clarity and size.