Round Image Corners

1. Import the image

   Press “Choose image”, drag the file into the editor or paste it with Ctrl+V. If you'd rather see how the effect looks first, the “Try a sample photo” button loads a demo shot.

2. Dial in the radius

   Move the “Corner radius” slider from 0 to 100%: the preview shows the curvature live. The starting value of 25% is a good baseline for cards and thumbnails.

3. Or switch to a circle

   Tick the “Circle crop” box to turn the photo into a perfect disc, the standard format for avatars and profile pictures. At that point the radius slider is no longer needed.

4. Download the transparent PNG

   Click “Download”: you get a PNG whose areas outside the curve are genuinely transparent, not white. “Undo” restores the sharp corners if you change your mind.

Corner curvature is one of those details the audience never names but always perceives: it softens the image and blends it into modern interfaces, where by now everything — buttons, cards, windows — is rounded. The most requested uses:

• Profile pictures and avatars — a disc with transparency adapts to any app background or email signature.
• Logos and badges — a square mark with softened corners instantly looks more polished in documents.
• Presentations — screenshots and photos with soft corners stand out elegantly from the slides.
• Graphics for websites and newsletters — images consistent with the corner radius of the surrounding components.

The advantage over doing it in CSS or in a layout program? The file is ready to go and renders identically wherever you paste it.

The “Circle crop” box inscribes a circle in the image and makes everything left outside it transparent. For a professional result it's best to start from a square base: on a rectangle the circle still gets computed, but you risk cutting away more than expected on the long side. The ideal two-move flow: first crop the photo to 1:1, centering the face or subject carefully, then come back here and switch on the circle.

A compositional tip: in avatars, the eyes should sit just above the center of the disc, and the head needs some breathing room around it, because many platforms trim the edge a little further. If you want the disc to stand out on light backgrounds, finish it with a thin frame using the tool to add a border to photos.

The corners “removed” by the curvature aren't filled with white: they become transparent pixels, and preserving that information requires a format with an alpha channel. JPG doesn't have one — any transparency would be flattened onto a solid color — so this tool always exports to PNG, which saves the curve losslessly and with clean edges. The practical differences between the formats are explained in the guide to JPG, PNG and WebP.

Technically, the browser draws your image on the Canvas inside a mask with curved corners: whatever falls outside the mask simply doesn't exist in the final file. Processing is one hundred percent local — the photo never leaves your device — and the downloaded PNG carries no watermark, ready for slides, websites and signatures.

The radius is expressed as a percentage, so the curvature stays proportional on a thumbnail and on a large image alike. A few road-tested settings: for screenshots headed for documentation or presentations, discreet values between 8 and 15% are plenty — they soften without drawing attention. Cards for websites and social media work well between 20 and 35%, while from 50% upward the image veers toward a “pill” shape, suited to labels and graphic buttons. On a square base, 100% is effectively a circle.

Two mistakes to avoid: applying the curvature to an image that will later be shrunk a lot (better to bring it to its final size first, so the radius you see is the radius you get), and using different radii on images that will appear side by side — the inconsistency catches the eye more than any other flaw.

For a flawless avatar: 1:1 crop → “Circle crop” → download the PNG. Three steps, no software to install.