Round Image Corners
Add rounded corners to an image with a transparent PNG output.
Processed on your device — never uploaded
The area outside the rounded rectangle becomes transparent.
What Is This Tool?
This tool clips your image to a rounded rectangle and exports a PNG, so the cut corners are transparent rather than white. Set the radius in pixels, or as a percentage of the shorter side so it scales with the image. A very large radius produces a pill or ellipse shape.
How It Works
Drop an image onto the box or select one.
Set the Corner radius.
Optionally switch to a percentage radius.
Click Download PNG.
Everything runs locally in your browser — the image you choose is decoded onto an HTML canvas on your own device and is never uploaded to a server.
Features
- Pixel or percentage corner radius
- Transparent corners in the PNG
- Large radius gives pill / ellipse shapes
- Original resolution preserved
- Client-side masking
Common Use Cases
- Making a rounded thumbnail for a card UI
- Softening a screenshot for a slide deck
- Preparing a rounded avatar or logo tile
- Matching an image to a rounded design system
Frequently Asked Questions
Why does the output have to be PNG?
The rounded corners need transparency, and PNG is the widely-supported format that stores an alpha channel. A JPEG would show white corners.
How do I get a perfect circle or pill?
Set the radius to at least half the shortest side (or 50% in percentage mode). For a circle, start from a square image.
Does the radius scale if I resize later?
No. It is applied at the current size. Use percentage mode before resizing, or round after resizing.
Is transparency in the source kept?
Yes, existing transparent areas remain transparent.
Is my image uploaded?
No, the mask is applied locally.