READY-TO-USE IMAGE TOOL
21:9 aspect ratio crop tool.
21:9 aspect ratio uses a 2520 × 1080 pixel frame (7:3). The calculator and local image crop below are already set to that shape, so you can enter dimensions or choose an image immediately.
This is an exact mathematical ratio, not a platform upload requirement. Your image stays in this browser.
Find the ratio
Enter your pixel dimensions. Whole-number dimensions reduce to an exact ratio.
Match a ratio
Set one dimension to find the other without stretching.
Matching height: 1080 px
Matching width: enter a height
Calculated values may have fractional pixels. Round to whole pixels when exporting a raster image.
Frame your image
Choose an image or drop it below. Drag the frame to position your crop; arrow keys move it too.
or drop a file here
No upload. The image never leaves your device; nothing is saved by this site.
Put this frame to work
For an exact 21:9 export at 1080 pixels high, choose 2520 pixels wide. A 2560 × 1080 display resolution is close but not exactly 21:9; its reduced ratio is 64:27.
Resizing preserves a source image's shape; cropping removes edges to fit a different one. Download the crop as PNG or JPEG above.
Common 21:9-style pixel sizes
| Width | Height | Pixels |
|---|---|---|
| 2560 | 1080 | 2,764,800 |
| 3440 | 1440 | 4,953,600 |
| 5120 | 2160 | 11,059,200 |
Most 21:9 displays are exactly 64:27, about 2.37:1. A true 21:9 frame at 1080 pixels high is 2520 wide, this page’s preset.
Frequently asked questions
Is 2560 × 1080 exactly 21:9?
Close but not exact: it reduces to 64:27, about 2.37:1. An exact 21:9 frame at 1080 high is 2520 × 1080.
What is 21:9 for?
Ultrawide monitors and cinematic gaming; it approximates 2.39:1 scope without letterbox bars.
What size does the 21:9 aspect ratio page start with?
The calculator and crop frame start at 2520 × 1080 pixels, which reduces to 7:3. You can type any other width and height.
Is my image uploaded anywhere?
No. The image is decoded and exported in your browser, so no image data is sent to a server.
Which image formats can I use?
Choose a PNG or JPEG image, and download the result as PNG or JPEG.
Can I crop to a different ratio?
Yes. The crop ratio menu offers 16:9, 4:3, 1:1, 9:16, 21:9 and 3:2, and the calculator accepts any width and height.