Free Online Circle Crop — Turn Any Image into a Round PNG

Why crop an image into a circle?

Circle-cropped images are everywhere: profile pictures on Discord, Slack, GitHub, and Twitter; app icons on mobile devices; team member photos on company websites; and design elements in presentations and social media graphics. A round crop with a transparent background blends seamlessly into any layout.

ToolKnit's Circle Crop provides a focused browser workflow for positioning a circular crop and exporting a PNG, without installing a full image editor.

How to use the Circle Crop tool

1. Upload your image — drag and drop or click to browse. Supports JPG, PNG, WebP, BMP, and GIF.
2. Position the circle — click and drag to move the circle overlay over the part of the image you want to keep.
3. Adjust the size — use the slider (10%–100%) to control the circle diameter.
4. Download — click “Download Circle PNG” to get a perfectly round image with transparent background.

Loading and export time depend on image dimensions and device performance. Inspect the circle placement and downloaded result before using it.

How the circle crop works technically

The tool creates a square offscreen Canvas with a side matching the selected circle diameter. A circular clip path made with arc() keeps the chosen image area; the square corners remain transparent. It exports PNG, one of several formats that support transparency. Image processing is local, while ordinary site resources and analytics are separate.

Best practices for circle cropping

• A square image can simplify framing — a 1:1 source still loses visible corner content outside the circle. If dimensions need changing, use the Image Resizer first; leave important content inside the circular boundary.
• Center your subject — faces and logos should be near the center for the best circle crop result.
• Choose enough source pixels — circle diameter is based on the shorter image side and selected percentage. A 1000 × 1000 image at 100% gives a 1000-pixel diameter; at 80% it gives 800. Canvas decoding and PNG export do not preserve original metadata or guarantee identical color-profile behavior.
• Check the background — since the output is transparent PNG, any background outside the circle disappears automatically.

Circle crop vs. regular crop: when to use each

Use regular crop (the Crop Image tool) when you need a rectangular output with specific aspect ratios like 16:9 or 4:3. Use circle crop when you need a round shape — typically for avatars, icons, or design elements where the image must blend into a non-rectangular layout.

Privacy: your images stay on your device

ToolKnit Circle Crop uses the HTML5 Canvas API to process your selected image locally in the browser, without uploading it for cropping. Loading the webpage and ordinary visit analytics can still use the network. Your downloaded PNG remains wherever you save it.

Frequently asked questions

How do I crop an image into a circle?

Upload your image to the ToolKnit Circle Crop tool. Drag to position the circle, adjust the size with the slider, then click Download to get a transparent PNG.

Is the circle crop tool free?

Yes, it is free without signup or watermarks. The current input cap is 50 MiB; device-dependent pixel guards are 24 or 50 megapixels. Browser memory and decoding support can impose additional limits.

Does circle crop upload my image to a server?

No. All processing happens locally in your browser using the HTML5 Canvas API. Your image never leaves your device.

What format does the circle crop export?

PNG with transparent background. The area outside the circle is fully transparent, making it perfect for avatars and overlays.

Can I resize the circle?

Yes. Use the size slider (10%–100%) to control the circle diameter. You can also drag the circle to reposition it on the image.

What image formats are supported?

Common inputs include JPG, PNG, WebP, BMP and GIF when the browser can decode them and they meet the limits. The output is a static PNG, not an animated GIF. A filename extension alone does not prove compatibility.