The short answer is MP4 with H.264 video and AAC audio. That is YouTube’s own recommendation, and it is right for almost everyone. The longer answer explains why the alternatives keep coming up.
Why the format matters less than you think
Every file uploaded to YouTube is re-encoded on arrival. Your MP4 is not what viewers receive — YouTube transcodes it into its own VP9 or AV1 streams at several resolutions and serves those.
This has an important consequence: the container you upload has almost no effect on what viewers see. What matters is how much information your file carries into that re-encode. A high-bitrate MOV and a high-bitrate MP4 of the same footage produce near-identical results.
So the choice comes down to practical factors — file size, upload time, and how reliably YouTube handles the file.
Container comparison
| Format | Typical size | Upload speed | YouTube handling |
|---|---|---|---|
| MP4 (H.264) | Baseline | Fastest | Recommended |
| MOV (ProRes) | 5–20× larger | Very slow | Accepted, slow to process |
| MOV (H.264) | Same as MP4 | Same as MP4 | Accepted |
| WEBM (VP9) | 30–50% smaller | Fast | Accepted |
| MKV | Varies | Varies | Accepted, less predictable |
The MOV row is where most confusion lives. MOV is a container, like MP4 — it is not inherently larger. What makes MOV files enormous is that Apple devices and editors frequently put ProRes inside them, a lightly-compressed editing codec that can run twenty times the size of H.264 for the same picture. A MOV containing H.264 is essentially an MP4 with a different extension.
That is why “should I upload MOV or MP4” usually resolves to “is your MOV ProRes or H.264?”. If it is ProRes and you have a fast connection, upload it — you are giving the encoder the best possible source. If your connection is ordinary, convert it to MP4 first and lose almost nothing.
Container versus codec
This distinction causes more trouble than any other in video:
- The container (MP4, MOV, MKV, WEBM) is the wrapper. It holds the streams and describes how they fit together.
- The codec (H.264, HEVC, VP9, AV1, ProRes) is the algorithm that compressed the picture.
A file that will not play despite ending in .mp4 almost always has a fine container and an
unsupported codec inside it. Converting to MP4 with H.264 specifically is the reliable fix,
because H.264 has hardware decoding on essentially every device made in the last fifteen years.
What to actually do
- Exporting from an editor? Choose MP4, H.264, high profile, and the highest bitrate you are willing to upload. See upload settings for target figures.
- Have a ProRes MOV and a fast connection? Upload it directly.
- Have a ProRes MOV and a slow connection? Convert to MP4 first.
- Have something that will not upload? Convert it to MP4. This fixes the large majority of rejected uploads.