HD vs SD: Which Video Quality Should You Download?
When you download a video you are usually offered several versions: SD, HD, 360p, 720p, 1080p. Picking the biggest number is not always the best choice. Here is what the labels mean.
What the numbers mean
The number is the height of the picture in pixels. A 720p video is 1280×720 pixels, a 1080p video is 1920×1080. “SD” normally means anything below 720p, and “HD” means 720p or above.
How much space does each use?
| Quality | Resolution | Approx. size per minute |
|---|---|---|
| 360p (SD) | 640×360 | 3–5 MB |
| 480p (SD) | 854×480 | 5–8 MB |
| 720p (HD) | 1280×720 | 10–18 MB |
| 1080p (Full HD) | 1920×1080 | 20–35 MB |
These are rough figures. The real size depends on the bitrate the platform used: a talking-head clip compresses far better than fast sports footage.
Which one should you choose?
- Watching on a phone: 720p looks sharp on almost every phone screen. 1080p is hard to tell apart at that size and takes twice the space.
- Slow or limited data: choose 360p or 480p. It downloads quickly and is perfectly watchable.
- Editing or watching on a TV: take the highest quality available.
- Sending on WhatsApp: messaging apps recompress video anyway, so SD is enough.
Why HD is sometimes missing
A downloader cannot create quality that is not there. If the original upload was low resolution, or the platform only kept an SD copy, then SD is the best that exists.