What is 720p resolution?
720p resolution is a video or image frame 1280 pixels wide and 720 pixels tall, in a 16:9 shape. That is 921,600 pixels, about 0.9 megapixels. YouTube's resolution page lists it as "720p (HD): 1280x720", the smallest of the sizes it labels HD.
The name only gives the height. The 1280 follows from the shape: a 16:9 frame 720 pixels tall is 720 × 16 ÷ 9 = 1280 pixels wide.
What the p means
The p stands for progressive scan: every line of the frame is drawn in one pass. The alternative, interlacing, draws odd and even lines in turns, and it is where 1080i comes from. There is no 720i in the broadcast standards. YouTube's upload encoding settings ask for progressive video and say interlaced footage should be deinterlaced before upload.
720p vs 1080p vs 4K
| Name | Pixels | Total pixels | Compared with 720p | YouTube's label |
|---|---|---|---|---|
| 2160p (4K) | 3840 × 2160 | 8,294,400 | 9 times | 4K |
| 1440p | 2560 × 1440 | 3,686,400 | 4 times | 2K |
| 1080p | 1920 × 1080 | 2,073,600 | 2.25 times | HD |
| 720p | 1280 × 720 | 921,600 | 1 | HD |
| 480p | 854 × 480 | 409,920 | Under half | SD |
| 360p | 640 × 360 | 230,400 | A quarter | SD |
All six are 16:9, so a picture made for one fits the others without cropping. Only the detail changes. 4K is exactly 720p tripled on each side, which is why a 1280 × 720 image scales to 3840 × 2160 cleanly but gains no new detail doing it.
Where 720p shows up on YouTube
- As a video resolution. 720p is on YouTube's list of standard 16:9 resolutions, and YouTube's encoding guide gives it a recommended bitrate of 5 Mbps at standard frame rates and 7.5 Mbps at 48 to 60 frames per second.
- As a thumbnail size. 1280 × 720 was the size YouTube recommended for video thumbnails for years. It is still accepted, well above the 640-pixel minimum width, but YouTube's help now recommends 3840 × 2160. Which one to upload is covered in the site's YouTube thumbnail size guide.
- As the A/B testing floor. YouTube's A/B test page says that if any thumbnail in a test is below "720p (1280 x 720)", all of them are downscaled to 480p for the test.
- As the largest public thumbnail file. The biggest thumbnail image YouTube's Data API documents for a video, the maxres size, is 1280 × 720.
Is 720p good enough?
For a thumbnail seen on a phone, usually yes: a feed card is never wider than the phone's screen, and the suggested column shows it far smaller.
On a TV or a large monitor, 720p is where softness starts to show. A 1280 × 720 thumbnail enlarged for a 4K screen is stretched to nine times its pixel count, and the stretching shows as blur on fine text and edges.
Why 720p matters for thumbnails
1280 × 720 is the floor worth respecting, not the target. It is the minimum that keeps a thumbnail eligible for full-quality A/B tests, and the size most guides still quote, so it is not wrong. But a new thumbnail exported at 720p throws away detail that a 3840 × 2160 export keeps, for no gain except a smaller file.
Design at 16:9 from the start, export at 3840 × 2160 when the source allows it, and treat 1280 × 720 as the size to fall back to when a file limit forces it.