Why is the output always PNG?

Rounded corners require transparency (alpha channel) at the corners. JPEG does not support transparency. PNG preserves the transparent corners so the image looks correct on any background.

How do I make a circular image?

Set the radius slider to 50%. On a square image, this produces a perfect circle. On a non-square image, it produces a pill/ellipse shape. For a perfect circle, crop the image to square first using the Image Crop tool.

What radius should I use for app icons?

iOS icons use approximately 22% corner radius (squircle approximation). Android icons use approximately 20% for the adaptive icon layer. For UI mockups, 15–25% is typical for modern card designs.

Will the rounded image look good on a dark background?

Yes. The transparent corners reveal whatever is behind the image — whether white, dark, or any colour. The anti-aliased edge ensures smooth rendering without jagged pixels.

Can I round just some corners?

No — this tool applies the same radius to all four corners. For asymmetrical rounding, use a full image editor.

How do I use rounded images in presentations?

Download the PNG and insert it into PowerPoint, Keynote, or Google Slides. Because the file has a transparent background, the rounded corners will show the slide background colour rather than a white box.

圓角處理

將任意圖片邊角圓角化,並匯出為透明 PNG。

100% in your browser. Your file never leaves your device.

Choose file

Output is always PNG to preserve transparency.

Round corner settings Corner radius (% of shorter side) 15

50% = circle/pill shape

Load an image to begin.

How to use

1. Drop your image onto the upload zone or tap to select from your device.
2. Adjust the corner radius slider — 10–20% for subtle rounding, 50% for a circle/pill.
3. Click "Round corners" to process.
4. Download the rounded PNG (transparent corners).

常見問題

Why is the output always PNG?: Rounded corners require transparency (alpha channel) at the corners. JPEG does not support transparency. PNG preserves the transparent corners so the image looks correct on any background.
How do I make a circular image?: Set the radius slider to 50%. On a square image, this produces a perfect circle. On a non-square image, it produces a pill/ellipse shape. For a perfect circle, crop the image to square first using the Image Crop tool.
What radius should I use for app icons?: iOS icons use approximately 22% corner radius (squircle approximation). Android icons use approximately 20% for the adaptive icon layer. For UI mockups, 15–25% is typical for modern card designs.
Will the rounded image look good on a dark background?: Yes. The transparent corners reveal whatever is behind the image — whether white, dark, or any colour. The anti-aliased edge ensures smooth rendering without jagged pixels.
Can I round just some corners?: No — this tool applies the same radius to all four corners. For asymmetrical rounding, use a full image editor.
How do I use rounded images in presentations?: Download the PNG and insert it into PowerPoint, Keynote, or Google Slides. Because the file has a transparent background, the rounded corners will show the slide background colour rather than a white box.

Last updated: 2026-05-20 By jarvisbox

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