What are SVG blobs?

SVG blobs are organic, irregular shapes generated with SVG <path> elements using cubic Bézier curves. They are popular in web design for background shapes, avatar masks, section dividers, and decorative elements.

Using your blob

As SVG: copy the SVG code and paste directly into your HTML for maximum control and crisp scaling at any size.
As background image: use the SVG as a background-image in CSS by encoding it as a data URI.
As a clip mask: combine the SVG path with clip-path: url(#blob-id) to clip images or content to the blob shape.

Performance tip

Inline SVGs are render-blocking if placed in the document head. For decorative blobs, use <img src="blob.svg"> or CSS background-image so the browser can defer loading. Avoid overly complex paths (100+ points) in large quantities as they increase paint complexity.

Understanding Bézier curves

SVG blobs are built from cubic Bézier curves. Each curve segment is controlled by four points: a start point, two control handles (which "pull" the curve toward them like magnets), and an end point. Moving a control handle further from the curve makes it more pronounced; bringing it close creates a sharper bend. You don't need to understand the math to use blobs, but knowing this explains why some shapes look smooth while others appear jagged.

Animating SVG blobs

SVG path shapes can be morphed with CSS animations using the d property (supported in Chromium and Firefox). A minimal morphing blob keyframe looks like this:

@keyframes morph {
  0%, 100% { d: path("M..."); }
  50%       { d: path("M..."); }
}
.blob { animation: morph 4s ease-in-out infinite; }

Both paths must have the same number of points and commands for smooth interpolation. GSAP's MorphSVG plugin handles mismatched paths automatically.

Accessibility note

Blob shapes used as decorative backgrounds should include aria-hidden="true" on the <svg> element so screen readers skip them. If the blob clips meaningful content (e.g., an avatar image), ensure the clipped content itself has appropriate alt text or accessible labels - the clip mask does not affect screen reader output.