GIF or MP4: which format should you actually use

The GIF format was finalised in 1989. It stores up to 256 colors per frame and compresses each frame on its own. Modern video codecs like H.264, which is what an MP4 normally contains, store the difference between frames and use millions of colors. The gap in efficiency is enormous.

The size difference, measured

A ten second screen recording at 800 by 600 pixels is a fair test. As a GIF at 15 frames per second and 256 colors it lands around 18 MB. The identical recording as an H.264 MP4 at the same resolution and frame rate lands near 1.6 MB, and it looks better because it is not limited to 256 colors.

The ratio holds across most content. Expect an MP4 to be five to fifteen times smaller than the same animation as a GIF. The busier the picture, the bigger the gap, because GIF has no way to exploit similarity between frames.

When GIF is still the right choice

• Email. Most email clients block video entirely but render animated GIFs, which is why marketing emails still use them.
• Places that only accept image files. Forum avatars, some wiki software, older content systems and certain print workflows check the file type and reject video.
• Very short loops with few colors. Under about two seconds with flat graphics the size difference shrinks and the simplicity of a single image file wins.

When MP4 wins

• Anything longer than three seconds.
• Anything photographic, including screen recordings of video content.
• Anything going on a website, where file size directly affects how fast the page loads.
• Chat apps. Discord, Slack, Telegram, WhatsApp and iMessage all play MP4 inline and loop it.

What about WebP and AVIF

Animated WebP sits between the two. It is a real image format, so it works anywhere an image is accepted, but it compresses far better than GIF, typically three to five times smaller. Browser support is now near universal, so for websites it is an excellent middle ground. The catch is that some desktop applications and older chat clients still do not display it.

AVIF compresses better still, but animated AVIF support remains patchy outside browsers, so it is not yet a safe default.

A simple decision rule

If the destination plays video, send MP4. If it demands an image and you control the website, send animated WebP. If it demands an image and you do not control the destination, send a compressed GIF. That covers almost every case.