Round Image Corners guide
Round image corners online and export the result as a transparency-preserving PNG.
What this tool does
The Rounded Corners tool clips an image to a rounded rectangle on a transparent canvas. The roundness control ranges from a small curve to a fully rounded shape based on the shorter image dimension. Original width and height stay unchanged; only pixels outside the curved clipping path become transparent.
Every result is exported as PNG because JPEG cannot preserve transparent corner pixels. Source JPG, PNG, and WebP files are accepted, but the filename extension and encoding change to PNG. The operation creates a fresh file without overwriting or modifying the selected original.
At maximum roundness, a square image approaches a circle, while a wide rectangle becomes a capsule-like shape rather than a circle. The tool does not add a border, shadow, background color, or CSS-only presentation. The rounded corners are baked into the exported pixel alpha channel.
How to use it
- Choose a supported image up to 25 MB.
- Move the roundness slider to the desired curvature.
- Select Round corners.
- Download the PNG result.
- Preview it over the actual page background before publishing.
Some apps display transparent pixels over black, white, or a checkerboard, so the same file can appear different across previews. Confirm that the destination accepts PNG transparency.
Choosing the roundness
Start with a lower setting for a card thumbnail or product photo that only needs softened corners. Increase it for an avatar, badge, or pill-shaped graphic. Because curvature is scaled from the shorter image dimension, the same percentage remains visually consistent across different image sizes. If the subject needs reframing first, use Crop Image. If the finished asset also needs an outline, download it here and continue with Image Border Maker.
Benefits
- Produces genuine transparent corner pixels
- Keeps source image dimensions
- Scales curvature to image proportions
- Accepts JPG, PNG, and WebP sources
- Exports a portable PNG rather than relying on CSS
- Performs clipping locally
Quality and compatibility
PNG is lossless but can be larger than JPEG for photographs. The browser rasterizes the source, which can remove metadata and color-profile information not carried through canvas export. If rounded corners are purely part of a website layout, CSS border-radius may be smaller and easier to change because it does not require another image file.