Round Corners Image FREE | Add Rounded Corners to Photos Online

Add rounded corners to any JPG, PNG, or WebP image. Adjust the corner radius from subtle rounding to a full circle. Transparent corners are preserved in PNG output. Preview the result and download instantly. No upload required.

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Any Radius

Circle Preset

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Round Image Corners

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Frequently Asked Questions

Rounded corners create curved edges where the corner pixels should be transparent — not white or any other colour. PNG supports alpha channel transparency, which is required to preserve the transparent corners. JPEG does not support transparency, so using JPEG output would fill the transparent corners with white, defeating the purpose of the rounding. PNG output is forced for all rounded corner downloads to ensure correct transparent corners in the output file.

Select Circle preset (50% radius) or drag the slider to 50%. For a perfect circle, your input image should be a square. If your image is not square, the circle will be an oval matching the original aspect ratio. For a perfect circle, first use the Crop tool with the Square 1:1 preset to crop the image to a square, then apply the Circle preset in the Round Corners tool. The result can be used as a profile photo on most social media platforms.

Most mobile app icons use a corner radius of approximately 22-25% of the icon width (the Apple iOS and Android design systems both use approximately this range). For a card or tile component look matching modern UI design systems, 8-12% radius is standard. For a subtle professional photo frame, 3-6% creates a refined, slightly softened look without dramatically altering the image.

Yes. The tool clips the image using a rounded rectangle path and draws only the pixels inside that path, leaving all outside pixels as transparent. Any existing transparent areas within the rounded rectangle are also preserved. The transparent corners are additive to any existing transparency in the source image.

In applications that do not support transparency — particularly some email clients, older PDF viewers, and certain image preview applications — transparent areas appear as white. If you need rounded corners but cannot use PNG transparency, you can place the rounded PNG over a solid background in a design application, flatten the layers to remove transparency, and save as JPEG.

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Free Rounded Corners Image Tool Online — Add Curved Edges and Circle Crop to Photos

Rounded corners are one of the defining visual characteristics of modern UI design. From app icons to profile photos, card components to product images, rounded rectangles permeate contemporary digital design because they feel friendlier, softer, and more polished than sharp-cornered squares. iOS app icons use a specifically calculated corner radius of approximately 22% that creates the distinctive superellipse (squircle) shape. Android app icons use a similar radius with slightly different proportions. Social media profile photos are displayed as circles by most platforms. The Round Corners tool on OneDocPDF handles all these use cases with a simple slider from 0% to 50% and one-click presets.

The circle preset (50% radius) is the most requested function — it creates a perfectly circular image from any square input, which is the standard format for profile photos across virtually all social platforms including LinkedIn, Twitter/X, Instagram, Facebook, and Slack. For non-square images, the circle preset produces an oval. The recommended workflow for platform profile photos is: use the Crop tool with the Square 1:1 preset to crop the image to a perfect square, then apply the Circle preset in this tool to produce a circular PNG with transparent corners.

PNG transparency is the technical foundation that makes rounded corners work correctly. When a corner is rounded, the pixels in the corner area outside the curve need to be completely transparent so that the rounded image can sit on any background colour without a visible rectangle of background colour in the corners. This is why all downloads from this tool are PNG files — JPEG does not have an alpha channel and would display white squares in all corners rather than rounded transparency.

In web development, rounded corners are commonly applied using CSS border-radius without image processing. However, when images need to be shared as standalone files — for email, print, social media, or document embedding — CSS cannot be applied and the actual image pixels must be clipped. This tool fills that gap, producing transparent-corner PNG files that can be placed on any background in any application without needing CSS or a design tool like Figma or Photoshop.

Continue your image workflow with related tools: Add Border before rounding corners for a framed circular look, Crop to Square before applying circle preset for perfect profile photos, Resize Image to target dimensions, Compress Image for web optimisation. All free on OneDocPDF.