Cut rounded corners into any picture, in pixels or as a percentage, on all four corners or just one side, with a transparent PNG or a filled JPEG at the end.
Clips the image to a rectangle with rounded corners and throws away whatever falls outside the curve. The canvas stays the same size, so nothing shifts or scales. Saved as PNG or WebP the corners are transparent and the picture sits cleanly on any background; saved as JPEG they are filled with a colour you choose. The radius can be a fixed number of pixels, handy when it must match a CSS border-radius, or a percentage of the shorter side, which keeps a batch of mixed sizes looking consistent.
A 1200 × 800 product photo with a 24 px radius on all corners looks like a card in a web layout that uses border-radius: 24px. The same photo at 50% gives a 400 px radius on every corner, which turns the wide image into a pill. A 512 × 512 avatar at 50% becomes a perfect circle with a transparent edge, ready for a profile picture that a site will not round itself. The PNG comes out at about 470 KB; the WebP version at quality 92 is about 120 KB with the same transparent corners.
Use it for thumbnails, app icons, avatars, presentation slides and email banners, where you cannot rely on CSS to round the picture for you. It also fixes hard-edged screenshots pasted into a document. If the image is far too large for where it is going, run Resize Image first so the radius you pick is in the right proportion. If you want a different shape than a rectangle, Clip Image cuts circles, hearts and polygons. And if the site or app already rounds images with CSS, leave the file square; rounding twice gives a thin jagged line.
Radius in px is exact; in % it is measured against the shorter side and capped at 50, because anything larger cannot fit. Which corners limits the rounding to the top, bottom, left or right pair, useful for a card image that meets a text block. Output defaults to PNG so the corners stay transparent; choose WebP for a much smaller file that also keeps transparency, or JPEG when the picture must open anywhere and a solid Background colour is fine.
Why are my corners white instead of transparent? You saved as JPEG, which cannot hold transparency, so the cut-away corners were filled with the Background colour. Switch Output to PNG or WebP and the corners become see-through.
How do I make a circle or a pill shape? Set the unit to percent and the radius to 50 with all corners selected. On a square image that gives a perfect circle; on a wide image it gives a pill with fully round ends.
Does the image get smaller or cropped? No. The file keeps its exact width and height. Only the pixels outside the rounded shape are removed, so the picture still lines up with a layout designed for the original size.
Can I round only the top corners? Yes. Pick Top, Bottom, Left or Right under Which corners. Top is the usual choice for a card header image that sits flush against a block of text below it.