MP4 vs HEVC vs AV1 in 2026: Which Video Format Should You Actually Use

You're about to convert a video and you're staring at a dropdown with MP4, HEVC, and AV1 in it, with no idea which one actually matters. Here's the short version: you don't need to understand codecs to get this right. You need one simple rule, which is below, and everything after it is optional reading.

If you'd rather not pick a codec manually: Video Converter →

The Short Answer

If you're not sure what device the video needs to play on, pick H.264 inside an MP4. It plays on basically everything, phones, TVs, old laptops, whatever your family actually owns. The file will be a bit bigger than it needs to be, and that's a fine trade for "it just works."

If you know the device is newer, say the last three or four years, and you'd rather have a smaller file, HEVC or AV1 both do that job well. Either one is a reasonable pick. If a ready-made export profile for your device or platform already picks one for you, just use that and don't think about it further.

That's genuinely the whole decision for most people. The rest of this post is for anyone curious why, not because you need it to choose correctly.

Wait, Is MP4 Even the Same Kind of Thing as HEVC and AV1?

This is the part that trips almost everyone up, including a lot of articles written about this exact topic. MP4 isn't actually a competitor to HEVC and AV1. It's a container, basically a box the video file comes in. HEVC and AV1 are codecs, the method used to compress what's inside that box.

An MP4 file can hold video compressed with H.264. It can also hold video compressed with HEVC. So "MP4 vs HEVC" is a little like asking whether you'd rather have a box or what's inside a different box. They're not really the same kind of choice, even though it gets talked about that way constantly.

When Each One Actually Makes Sense

Three situations cover almost everyone:

You don't know the device, or it's older

Use H.264 in an MP4. This is the safest default there is. Nearly every device made in the last fifteen years can play it without issue, which matters more than file size when you don't know where the video is headed. Sending a birthday video to a group chat where you have no idea what phones or tablets people are opening it on is exactly this case.

The device is recent and you want a smaller file

HEVC is a solid pick here. It compresses noticeably better than H.264, especially for 4K or HDR footage. Support is broad on phones and TVs from the last several years, though not universal on everything. If you're building a video library on a reasonably modern phone or streaming box and don't want it eating your storage, this is a sensible everyday choice.

You care most about file size and your devices are modern

AV1 compresses even better than HEVC in most cases, and it's royalty-free, which is part of why it's shown up on more devices recently. Hardware support has become common on phones, computers, and TVs from roughly the last few years. It's still worth a quick check if you're targeting an older device specifically. This is the right call for something like archiving a lot of 4K footage long-term, where every bit of saved space adds up.

You might also run into VP9 as an option. It's an older, royalty-free codec mainly associated with video uploaded to YouTube and the web rather than personal devices. AV1 has largely succeeded it, so if VP9 and AV1 are both on the table, AV1 is the more future-proof pick.

If You Really Don't Want to Think About Devices at All

Default to H.264 inside MP4. It's the one choice that's extremely unlikely to leave someone unable to open the file you send them. The tradeoff is file size, not compatibility, and in most everyday situations that's the trade worth making.

If this comes up often enough that picking a format manually gets tiresome, a converter with ready-made profiles for specific devices and platforms (Apple devices, social media, streaming services, and so on) does this decision for you. You pick where the video is going, not which codec to use.

A Little More on Why the Compression Differs (skip if you don't care)

Newer codecs like HEVC and AV1 don't just compress harder, they compress smarter. Each new generation finds better ways to describe what's actually changing between frames of video, instead of treating every frame as a fresh picture. That's why a newer codec can hit a smaller file size at the same visual quality rather than simply throwing away more detail. It doesn't change which codec to pick, just explains why the numbers land where they do.

If you remember nothing else from this post: MP4 and HEVC aren't really competing with each other, and when you're not sure what to pick, H.264 inside MP4 is the choice that almost never goes wrong. Everything past that is optimization, not a requirement.