Resize an image without stretching or losing its original
Choose pixel dimensions, keep the aspect ratio, and inspect the exported image.
Resizing changes the number of pixels in a picture. It is useful when a site asks for a maximum width or when a large original would slow down a page. It does not automatically crop the picture or make a blurry source sharp.
Work out the intended dimensions
If a source is 2400 × 1600 pixels and you set its width to 1200 with its aspect ratio preserved, the matching height is 800. This avoids stretching circles into ovals. In the image resizer, select the file, enter a target width, and leave aspect-ratio preservation on unless you deliberately need a new shape.
A target width larger than the source creates more pixels by interpolation, but it cannot recreate details the camera or screenshot never captured. For an exact crop, use a crop tool instead of unlocking the aspect ratio and forcing both dimensions.
Choose an output format
JPG is suitable for many photographs but has no transparency. PNG can retain transparent backgrounds and crisp edges, often at a larger size. WebP can be compact for both photos and graphics when the destination accepts it. Check the output preview, pixel dimensions, and file size before saving it.
Keep the source
The browser draws the result locally and offers a download. The original selected file is not replaced. Keep that original in case you later need a different size or a less compressed export. Large files can strain memory on a phone, so work from a reasonable source when possible.