Round Image Corners Free
Round the corners of any photo and export as a clean transparent 32-bit PNG file.
- 100% free
- Files stay on your device
- No sign-up, no watermark
Choose files or drag & drop
Upload PNG, JPG, JPEG, WEBP, BMP files to convert locally inside your browser.
What is Round Image Corners?
The Round Corners tool transforms sharp, rectangular photographs and interface graphics into sleek, modern assets with smoothly curved borders. Designed for UI designers, content creators, and document publishers, this utility takes PNG, JPG, WEBP, or SVG files and applies mathematical quadratic clipping paths with sub-pixel antialiasing across each corner. You can set a global corner radius or configure individual corner values independently, making it ideal for creating rounded avatar profile pictures, mobile app icon mockups, and card UI components. The clipped corner regions are rendered with zero alpha transparency, meaning the final image seamlessly blends over any website or presentation backdrop. A key technical limitation to understand is that saving the output as a JPEG will replace transparent rounded corners with opaque matte pixels, so exporting as 32-bit PNG is mandatory to preserve transparent curved corners.
How to use Round Image Corners
- 1
Select Photo or Graphic
Upload your image to calculate its initial pixel dimensions and view the live corner radius preview.
- 2
Tune Curve Radius & Selective Corners
Adjust the curvature slider or input explicit pixel values, choosing whether to curve all four corners uniformly or customize individual corners.
- 3
Export Transparent PNG
Verify the transparency checkerboard around the curved edges and download your finished rounded asset in lossless PNG format.
Frequently asked questions
Why do my rounded corners have a white box when saved as JPEG?
The JPEG image specification lacks an alpha transparency channel. To keep the areas outside the rounded corners transparent, you must select the PNG export format.
How do I create a perfectly circular avatar image?
Ensure your source graphic has equal width and height (a 1:1 square ratio), then slide the corner radius slider all the way to 50% or maximum pixel radius.
Does the corner rounding process cause edge pixelation or jagged lines?
No. Our engine uses HTML5 canvas 2D sub-pixel antialiased path clipping, which computes soft edge gradients along the curve to prevent jagged aliasing artifacts.
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