GIF vs MP4: Which One Should You Actually Use?
If you've ever dropped a GIF into something and watched it crawl, you've met the main problem with the format. It's huge for what it does. So why does anyone still make them? Because GIFs work in places video doesn't. This guide is about telling those two situations apart, so you stop guessing.
What's different underneath
GIF is from 1987. Every frame is stored as a whole picture with at most 256 colours, there's no sound, and the compression only knows how to squash repeated patches of colour. That's why flat cartoons make decent GIFs and a photo of someone's face looks like it was printed on a sponge.
An MP4 uses a video codec, usually H.264. It stores a frame now and then and, in between, only what changed, and it throws away detail your eyes don't notice. The same few seconds take a small fraction of the space. The price is that it needs a video player to run, and a video player usually wants to be told to loop.
Same clip, four formats
| Format | Size | Compared with GIF |
|---|---|---|
| GIF | 658 KB | - |
| Animated WebP | 129 KB | about 5 times smaller |
| MP4 | 26 KB | about 25 times smaller |
| APNG | 1,046 KB | about 1.6 times bigger |
That MP4 number isn't a typo. A synthetic test clip is a best case for video, so don't expect 25 times on your holiday footage, but a ratio of ten or more is normal. If you've ever wondered why the GIF of a ten-second screen recording came out at many megabytes, this is why.
Where a GIF is still the right answer
- Email. Most email apps will animate a GIF and almost none will play a video. The big exception is Outlook on Windows, which has long shown only the first frame, so put the important part in frame one.
- Anywhere that says "image". Forum posts, support tickets, CMS fields, some chat tools. If the upload box only takes pictures, a GIF is how you get movement in.
- Reactions and short loops in chat. A GIF autoplays inline and loops forever, with no controls to get in the way. A video usually shows a player.
- Documentation that gets exported. A GIF survives being pasted into a slide or a wiki where a video link wouldn't.
Where MP4 wins, and it isn't close
- Your own website. Use a video tag with autoplay, loop, muted and playsinline. Browsers only autoplay video that's muted, so if there's no sound you lose nothing. Pages load faster and look better.
- Anything longer than a few seconds. GIF size grows with every second. Video barely notices.
- Anything with photos, gradients or skin. The 256-colour limit shows up as banding. Video doesn't have that limit.
- Social posts. Several large platforms convert an uploaded GIF to video behind the scenes anyway, so you're better off giving them a clean MP4 yourself.
The middle option: animated WebP
WebP is the format most people forget. It loops by itself like a GIF, it has full colour, and in the table above it was about a fifth of the GIF's size. Current versions of Chrome, Edge, Firefox and Safari all play it. The catch is the long tail: some chat apps, email clients and editing tools don't accept it yet. If you control the page, use it. If you're sending to people on who-knows-what, a GIF is safer.
A quick way to decide
| Going to | Send | Why |
|---|---|---|
| An email newsletter | GIF, kept short | Video doesn't play in most inboxes |
| Your website or landing page | MP4 (WebP as a fallback) | Smaller, sharper, faster |
| A README or docs page | GIF, or MP4 if it supports video | Check what the page renders |
| A chat reply | GIF | Loops inline with no player |
| A social post | MP4 | The platform will recompress it anyway |
| An emoji or sticker slot | Whatever the app's rules say | Each app has its own size and format |