Add rounded corners to your images with customisable border radius.
Adjust the roundness of the corners
Choose between pixels or percentage
Color for transparent corners (use transparent for PNG)
The round corner tool allows you to add smooth, rounded corners to your images with customizable border radius. This creates a modern, polished look commonly used in web design, social media graphics, profile pictures, and user interfaces. You can control the corner radius using either fixed pixel values or percentage-based measurements, and choose a background color for the areas outside the rounded shape.
The tool offers two ways to specify corner radius:
The round corner effect uses HTML5 Canvas with quadratic curves to create smooth, anti-aliased corners. The algorithm creates a clipping path in the shape of a rounded rectangle, then draws the image within that path. The background color fills areas outside the rounded shape. When percentage units are used, the radius is calculated based on the smaller dimension of the image to ensure consistent appearance. Output is saved as PNG to preserve transparency and quality.
This tool works in all modern browsers that support HTML5 Canvas API, including Chrome, Firefox, Safari, Edge, and Opera. All processing happens locally in your browser for privacy and speed - your images are never uploaded to a server.
Pixels provide a fixed radius regardless of image size (e.g., 50px corners are always 50px). Percentage is relative to the image's smaller dimension, so 10% radius on a 1000px image equals 100px, but on a 500px image equals 50px. Use pixels for precise control, percentages for consistent appearance across different sizes.
To create a perfect circle, start with a square image (same width and height), then set the radius unit to "Percentage" and the radius value to 50%. This will round the corners completely, creating a circle. For rectangular images, 50% will create a pill or stadium shape.
Transparent backgrounds are ideal for web use because they allow the rounded image to sit seamlessly on any background color or pattern. Without transparency, the corner areas will show whatever color you select, which may clash with your page background. PNG format preserves transparency perfectly.
Currently, this tool rounds all four corners uniformly. For asymmetric rounding (e.g., only top corners), you'd need to use image editing software like Photoshop or GIMP that offers individual corner control. This tool is optimized for the most common use case of uniform corner rounding.
The tool automatically clamps the radius to prevent invalid shapes. The maximum radius is limited to half the smaller dimension of the image. For example, on a 200x400px image, the maximum effective radius is 100px (half of 200px). Values above this will be capped at the maximum.
Yes, the tool handles images of any resolution. However, very large images (10+ megapixels) may take a few seconds to process depending on your device. All processing happens in your browser's memory, so extremely large images might be limited by available RAM on low-end devices.
No, the rounding process preserves the original image quality. The tool uses lossless PNG format for output, so there's no compression degradation. The only change is the shape - the pixels within the rounded area remain at their original quality.
This tool processes one image at a time. For batch processing of multiple images with identical settings, you would need to process each image individually. If you need bulk processing, consider using image processing software or scripts that support batch operations.
For profile pictures, use 50% percentage on square images to create perfect circles, which is the standard for most social media platforms (Twitter, Facebook, LinkedIn). If your platform displays square avatars with rounded corners, use 10-15% for a modern look. Always check your platform's specific requirements.
Yes, but with considerations. Use a matching background color rather than transparent if possible, as some email clients have limited transparency support. PNG format works well in modern email clients. Test your rounded images across different email clients (Gmail, Outlook, Apple Mail) to ensure consistent appearance.
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