Image Round Corners

What are rounded image corners?

Rounded image corners are an effect where the four sharp corners of a rectangular image are replaced with smooth circular arcs, producing a softer, friendlier silhouette. Instead of a hard 90° angle at each corner, a rounded corner curves gently from one edge to the next, cutting away the corner pixels and revealing whatever sits behind the image. The radius of that arc — measured in pixels — controls how pronounced the rounding is: a small radius produces a subtle bevel, while a large radius creates a pill or capsule shape.

Rounded corners are one of the most popular visual treatments in modern UI and web design. They soften the look of thumbnails, avatars, cards and buttons, and they help photos blend into designs that already use rounded geometry. Because the effect removes corner pixels rather than drawing over them, the result depends on the output format: PNG and WebP support transparency, so the cut-away corners show through to whatever is behind the image, while JPG fills them with a solid color (typically black). This tool applies the rounding entirely in your browser using the Canvas 2D API, so your photos are never uploaded.

How the round corners tool works

This tool uses the browser's Canvas 2D API. After decoding your image, it creates a canvas of the same pixel dimensions, leaves the background transparent (no fill), and then builds a rounded-rectangle clip path using ctx.roundRect on modern browsers, with a fallback to ctx.arcTo for older ones. The image is then drawn inside that clipped region with ctx.drawImage, so only the pixels inside the rounded rectangle are kept — everything in the corners is cut away to transparency.

The radius slider goes from 0 to 200 pixels. A radius of 0 produces no rounding (a sharp rectangular image, essentially a passthrough). The radius is automatically capped at half of the shorter image dimension to prevent the arcs from overlapping and producing an invalid shape — at the maximum, the result becomes a perfect circle or capsule. PNG is the recommended output format because it preserves the transparent corners; WebP also supports transparency. JPG does not support transparency, so the cut-away corners are filled with black in the encoded file.

Corner radius values and their effect

The radius directly controls how much of each corner is cut away. The table below shows what each range of radii does to the image:

Radius	Effect	Typical use
0 px	Sharp corners — original	Passthrough, square thumbnails
4–12 px	Subtle bevel	Photo cards, blog images, soft modern UI
15–30 px	Noticeable rounding	Avatars, thumbnails, social cards
40–80 px	Strong rounding	App icons, button-style images
100–150 px	Heavy rounding	Sticker mockups, decorative frames
≥ half of shorter side	Pill / capsule / circle	Avatar-style fully rounded ends

Start with the default 20 px and adjust until the corners match the rest of your design. The radius is capped automatically, so very large values still produce a valid shape.

When to round image corners

Rounding corners is the right choice whenever a hard rectangular edge feels too sharp or too literal for the design. Common scenarios include:

• Avatars and profile pictures. A rounded square or circle is the de facto standard for user avatars across most apps and social platforms.
• Photo cards and thumbnails. Rounded corners give gallery thumbnails and content cards a softer, more inviting look.
• UI integration. Images placed inside rounded UI components (buttons, panels, modals) look more cohesive when their corners match the surrounding geometry.
• Social media posts. Rounded photos stand out against square or text-heavy feeds and feel less rigid.
• Marketing and ad creative. A consistent corner radius across a campaign gives creative assets a unified, branded feel.
• Stickers and decorative elements. Heavy rounding or full pill shapes turn photos into playful graphic elements.
• Print and editorial design. Rounded photos in magazines and brochures feel more contemporary than sharp-cornered ones.

Whenever a photo needs to feel softer, friendlier, or more integrated with rounded UI, rounding the corners is usually the simplest and most effective treatment.

How to round image corners

Rounding corners with this tool takes only a few seconds and runs entirely in your browser — no uploads, no sign-up, no watermark. The tool decodes your image locally, clips a rounded rectangle through the Canvas API, and lets you export the result in the format you need. Follow these steps:

1. Upload your image. Click the upload area or drag and drop a JPG, PNG, WebP, GIF or BMP file. The image is decoded and previewed instantly.
2. Set the corner radius. Use the slider from 0 to 200 px. 0 produces no rounding, the default 20 px gives a noticeable but moderate curve.
3. Choose an output format. Pick PNG or WebP to keep the transparent corners, or JPG if you need a smaller file (the corners will be filled with black).
4. Click Apply Round Corners. The tool clips the image and shows the original and rounded file sizes side by side.
5. Download the rounded image. Click "Download Rounded" to save the result. The original file stays untouched on your device.

Because every step runs locally in your browser using JavaScript, your image is never uploaded to a server. This makes the round corners tool completely private, fast and suitable for sensitive or confidential images.