How to Add Rounded Corners to an Image Online

Adding rounded corners to an image can make it look more polished and modern, especially for use on websites, presentations, or social media. While CSS can apply the effect for web use, it does not create a new image file; for a downloadable result, a browser-based tool is needed, with PNG being best for transparent corners. The ideal corner radius is typically between 16px and 48px for screenshots, and a thin border can help if the image's edge blends into the page background.

Rounded corners can make a screenshot, avatar, product image, or blog graphic feel more polished. The effect is small, but it often makes an image fit better inside a modern website, presentation, or social post. The easiest way to add rounded corners depends on what you need next. If the image is only going on a website, CSS might be enough: img { border-radius: 24px; } But CSS does not create a new image file. If you need to download and use the edited image somewhere else, you need a tool that exports the result. That is where a browser-based image tool is useful. PNG is usually the best choice when you want transparent corners. JPG is fine for photos when transparency does not matter. WebP is a good modern option for web use. Rounded corners are especially useful for: They are not always needed. If the image already sits inside a designed frame, extra rounding can look redundant. But for raw screenshots, a little radius and padding can make the image feel more intentional. Use a border when the edge of the image blends into the page. This often happens with screenshots that have a white or very light background. A thin gray or muted color border is usually enough. Thick borders can work for social graphics, but they often look heavy in documentation or product pages. Use transparent background when you want the image to sit naturally on different page colors. Use a solid background when you want a consistent card-like image, especially for social media, slide decks, or thumbnails. The most natural-looking rounded corners are usually subtle. Try a radius between 16px and 48px for normal screenshots, then adjust based on image size.