What 4K (UHD) means
- Pixels
- 3,840 × 2,160
- Megapixels
- 8.3
- Shape
- 16:9
At 300 DPI this is a 12.8 × 7.2 inch print, at 150 DPI a 25.6 × 14.4 inch poster.
Scale needed from common sizes
Sources are rotated to match the target shape. Upscaling always overshoots a little, so resize down afterwards.
| Your image | Scale needed | Output before resize |
|---|---|---|
| 320 × 240 | Too small, use a bigger source | n/a |
| 640 × 480 | Too small, use a bigger source | n/a |
| 800 × 600 | 4× (Pro), then resize 1.2× | 3,200 × 2,400 |
| 1,024 × 768 | 4× (Pro) | 4,096 × 3,072 |
| 1,280 × 720 | 4× (Pro) | 5,120 × 2,880 |
| 1,920 × 1,080 | 2× (free) | 3,840 × 2,160 |
| 2,560 × 1,440 | 2× (free) | 5,120 × 2,880 |
| 4,032 × 3,024 | Already big enough, just resize | n/a |
Calculate for your image
Enter your image size. The upscale button updates to the scale you need.
How to upscale to 4K (UHD)
- Check your image size in pixels (Get Info on Mac, Properties on Windows, or drop it in the upscaler).
- Find the scale in the table or type your size into the calculator.
- Upscale with that scale. The smallest scale that reaches the target is the fastest. If the table says 4× then resize, the next step covers the rest.
- Resize to exactly 3,840 × 2,160 with the resize tool.
Questions
How many pixels is 4K (UHD)?
3,840 × 2,160, which is 8.3 megapixels in a 16:9 shape.
What scale takes a 1080p image to 4K (UHD)?
2×. 1920 × 1080 becomes 3,840 × 2,160, then resize or crop to exactly 3,840 × 2,160.
Will an upscaled image look like a native 4K (UHD) image?
It will look sharp at normal viewing distance, with clean edges and plausible texture. The model invents detail that fits, so tiny text or faces far from the camera will not match a true high-resolution original.
What if my image has a different shape?
Crop to 16:9 first with the crop tool, then upscale. Otherwise one side lands on the target and the other side overshoots or falls short.
Which scales are free?
2× is free and runs on your device, 5 images a day. 4× needs Pro and runs on your device too.
Prints this size covers
Other target sizes
- Upscale to 5K5,120 × 2,880
- Upscale to 8K7,680 × 4,320
- Upscale to 2000 × 2000 pixels2,000 × 2,000
- Upscale to 3000 × 3000 pixels3,000 × 3,000
- Upscale to 4500 × 5400 (print on demand)4,500 × 5,400
- Upscale to 6000 × 6000 pixels6,000 × 6,000
- Upscale to 12 megapixels4,000 × 3,000
- Upscale to 24 megapixels6,000 × 4,000
- All target resolutions
- Resize to 3,840 × 2,160