Resolution is the number of pixels in an image.
In general terms, the higher the resolution, the better the image quality.
The following terms are used for different video resolution values that are common in video calling for WebRTC:
- QVGA – 320×240
- VGA – 640×480
- 720p (or HD 720) – 1280×720
- 1080p (or HD 1080) – 1920×1080
- 4K – 4096×2160
WebRTC isn’t limited in the resolution it can support. The limit is caused by browser implementations, processor capabilities and network conditions, as the higher the resolution, the more computation and bandwidth it requires.
Most WebRTC implementations to date have been able to reach 720p resolutions, with 1080p starting to be introduced.