A crop ratio sets the shape of a selection; it does not set its final pixel dimensions. In Image Cropper, choose a ratio such as 1:1 or 16:9, position the box over the content you want, and check the exported dimensions. Use Image Resizer afterwards if the destination needs a particular size.
For example, a 1920 × 1080 selection is 16:9. A 1280 × 720 image has the same ratio, but contains fewer pixels. Cropping chooses which source pixels remain; resizing determines how many output pixels represent them.
Turn the source before positioning the crop
Choose one JPEG, PNG or WebP, up to 64 MiB and 40 megapixels. If it needs a quarter turn, set 90, 180 or 270 degrees first. The preview and crop coordinates then refer to the turned image.
Coordinates start at zero in the top-left corner. Enter pixels or percentages, or drag the box and its handles. Arrow keys move it and Alt plus arrows resize it. A thirds grid can help position the subject. A typed rectangle outside the image is refused, while moving the preview box keeps it inside the available area.
Free leaves the rectangular ratio unlocked. Fixed choices include square, landscape, portrait and print-size ratios. Whole-pixel rounding still applies, so inspect the reported dimensions when you need an exact integer ratio.
Plan a crop with simple dimensions
Aspect Ratio Calculator can calculate a missing side from a ratio and one measurement:
| Ratio | Known width | Matching height |
|---|---|---|
| 4:3 | 1600 px | 1200 px |
| 16:9 | 1920 px | 1080 px |
| 1:1 | 1080 px | 1080 px |
Suppose the source is 3000 × 2000 and you want a centered 1920 × 1080 crop. The left edge is 540 and the top edge is 460. Move that rectangle if the subject is off-center, rather than keeping the arithmetic center at the expense of a face or caption.
After cropping, resize to 1280 × 720 if that is the required delivery size. Because the crop already has the right shape and enough source pixels, proportional downscaling can reach those dimensions without stretching it.
Treat print ratios and print resolution separately
The print-size choices supply a shape. Print resolution (DPI) reports how large the selected pixels would print; it does not resample them or write that chosen print-density value into the export.
A 1920 × 1080 crop corresponds to 6.4 × 3.6 inches at 300 dpi, or 12.8 × 7.2 inches at 150 dpi. The pixel dimensions are identical in both calculations. Use the print service's requirements to decide whether the available pixels are sufficient.
Check circle masks and output formats
Cut a circle keeps the largest circle that fits the shorter side of the selection. The downloaded file still has rectangular dimensions. PNG and WebP can keep the outside area transparent; JPEG fills it white.
The cropper does not provide keystone correction, arbitrary-angle rotation or irregular selection. It writes a new image without copying source metadata. JPEG/WebP encoding can change fine detail, even though the crop itself selects pixels without scaling them.
Keep the whole picture when the ratio would cut too much
If a square removes people at the ends of a group photograph, consider Canvas Padding and Square Fit. Its ratio modes build a canvas around the picture; its 1080-square preset can fit a larger image down without cropping. Transparent, solid or blurred backgrounds fill the spare area.
Leave frames off when exact final dimensions matter, because a frame adds an outer band. For a broader comparison of fitting, cropping and padding, use the guide to exact image dimensions.
Review each composition
The cropper handles one image per run. Reusing percentages can help with similarly framed pictures, but inspect each selection: the same rectangle can preserve the subject in one photo and cut it off in another.
Open the download and check the edges, dimensions and any transparent corners. If you resize it afterwards, check that final file as well. Keep the original so you can move the crop again without working from an already reduced copy.