MP4 vs MOV vs WebM: Video Formats Explained Simply
Video files come with different endings: .mp4, .mov, .webm, .mkv. They can look identical when playing, yet one opens on your phone and another refuses. The reason is the difference between a container and a codec.
Container and codec
The container is the box: the file type you see in the name. The codec is the method used to compress the picture and sound inside the box. A device needs to understand both to play the file.
The common containers
| Format | Where you meet it | Plays on |
|---|---|---|
| MP4 | Social media, phones, cameras | Practically everything |
| MOV | iPhone recordings, Mac editing | Apple devices, most modern players |
| WebM | Web browsers, streaming sites | Browsers and Android; limited on older Apple devices |
| MKV | Long recordings with several audio or subtitle tracks | Computers with a capable player; few phones by default |
The codecs inside
- H.264 (AVC). The most widely supported. Larger files than newer codecs, but it plays anywhere.
- H.265 (HEVC). About half the size for the same quality. Used by recent phones; older devices may not play it.
- VP9 and AV1. Efficient, royalty-free codecs used heavily by streaming sites. Good support on new devices, weaker on old ones.
Which should you choose?
If you simply want the video to play, share and edit without trouble, choose MP4 with H.264. Social platforms deliver most of their video that way, which is why downloader tools mainly offer MP4.
When a file will not play
Install a free player that carries its own codecs, such as VLC. If you need to send the file to someone else, convert it to MP4 with a free converter such as HandBrake.