Round the Corners of an Image
Soften a square thumbnail, app icon or product shot with rounded corners. Set the radius in pixels or as a percentage, and the result is saved as a PNG with genuinely transparent corners — built on your own device.
100% private — this tool runs in your browser. Your file is never uploaded to any server.
How it works
The image is clipped to a rounded rectangle and everything outside the curve becomes transparent, which is why the output is always PNG — JPG cannot store transparency and would fill the corners with white. The radius is measured in the image’s own pixels: 40 px is a gentle curve on a 400-pixel avatar and barely noticeable on a 4000-pixel photo, so the percentage option is often easier — 10% gives the same look at any size, and 50% turns a square into a circle or a wide image into a pill. The curve is anti-aliased, so edges stay smooth when the image is displayed on a coloured background.
Step by step
Add your images
Drop one or more, or tap to choose.
Set the radius
In pixels, or as a percentage of the shorter side for size-independent results.
Round corners
The image is clipped on your device.
Download
Save the PNG — the corners are transparent, not white.
Frequently asked questions
How do I make rounded corners on a picture?
Add it, choose a radius and press Round corners. Download the PNG; the corners are transparent so it sits cleanly on any background.
Why is the output a PNG even though I uploaded a JPG?
Because JPG has no transparency. To keep the corners see-through, the file must be PNG or WebP; PNG is the universally supported choice.
What radius should I use?
10% of the shorter side is a typical app-icon look; 20–25% is noticeably rounded; 50% makes a circle from a square or a pill from a rectangle.
Can I get a circle instead of rounded corners?
Yes — set the unit to percent and the radius to 50 on a square image. For a circle cut from a non-square photo, the Crop Circle tool is more convenient.
Will the corners look jagged?
No. The clip path is anti-aliased by the browser, so the curve is smooth at full resolution.
Does it change the image size?
No. Width and height stay the same; only the corners become transparent.
Is my image uploaded?
No. Clipping is done by your browser’s canvas; nothing leaves your device.
Can I add a border after rounding?
Rounding first and then adding a flat border gives a square frame around a rounded image. For a rounded frame, add the border first and then round the corners of the result.