Why round the corners of an image?
Rounded corners are one of the most recognizable signatures of modern design. App icons, avatars, cards, buttons, and thumbnails almost universally use softly curved corners because they feel friendly, polished, and less harsh than sharp right angles. Rounding the corners of a photo instantly makes it look at home in a contemporary interface, a presentation slide, or a social media post.
The catch is that a rounded corner needs something behind it. When you clip the corners of a rectangular image, the area outside the curve has to become transparent so that whatever is behind the image shows through. Pixohub handles this automatically by exporting a transparent PNG: the four corners are cut away cleanly and the rest of the picture is preserved, so you can drop the result onto any colored background, card, or webpage and the rounded shape blends in seamlessly.
You have full control over the radius. A small radius produces a gentle softening of the corners, ideal for photos and product images. A large radius creates a strongly curved, card-like look, and if you push it far enough on a square image you can even approach a pill or circular shape. A live preview shows the exact curvature as you drag the slider, so you can match the corner style used elsewhere in your design.
Transparent output and how it works
Because rounded corners require transparency, Pixohub always exports this tool as a PNG. PNG is the ideal format here because it supports a full alpha channel, meaning the clipped corners are genuinely see-through rather than filled with a solid color. JPG cannot do this — it would fill the corners with white — which is why rounding corners and transparent PNG go hand in hand.
Under the hood, Pixohub draws your image onto an HTML canvas and applies a rounded-rectangle clipping path before exporting. Everything runs locally in your browser, so the image is never uploaded, the operation is instant, and your file stays completely private. There is no quality loss to the visible part of the image; only the corner pixels outside the curve are removed.
Rounded-corner PNGs are perfect for UI mockups, profile pictures, email banners, and any place where a rectangular photo would look too stiff. Once you have the transparent PNG, you can layer it over gradients, patterns, or solid colors and the smooth corners will always match the background behind them. And like every Pixohub tool, it is free, requires no signup, and never adds a watermark.