SVG Blob Generator
About the SVG Blob Generator
The SVG Blob Generator creates smooth, organic blob shapes as scalable vector graphics, ideal for modern backgrounds, decorative accents, and image masks. Instead of perfect circles or rectangles, blobs are irregular rounded forms that add a soft, hand-drawn feeling to landing pages and illustrations. The generator uses a seeded random algorithm, meaning each seed value produces a specific, reproducible blob; change the seed and you get a new shape, but the same seed always regenerates the identical blob so your designs stay consistent.
Technically, a blob is built by placing several control points around a center at varying radii, then connecting them with smooth cubic Bezier curves so the outline flows continuously without hard corners. Parameters typically include the number of points (more points yield more complex, wavier edges), a randomness or complexity factor that controls how much each radius deviates from a circle, and the seed that drives the pseudo-random variation. The output is a compact SVG path you can paste directly into HTML or a design file.
Because the result is SVG, blobs scale to any size without pixelation and stay tiny in file size compared to raster images. Common use cases include section backgrounds behind text or product shots, avatar and image clipping masks (using the path as a clip-path), animated morphing shapes, and playful illustration elements. You can recolor a blob simply by changing the fill, and apply a CSS gradient as the fill for extra depth.
Practical tips: lock in a seed once you find a blob you like so it never changes between regenerations, and use fewer points for calm, gentle shapes or more points for energetic, lumpy ones. Pair generated blobs with a Gradient Generator to fill them with a smooth color blend, or combine them with an SVG Wave Generator to build layered, depth-rich page sections. When using a blob as an image mask, make sure the path's aspect ratio roughly matches your photo to avoid awkward cropping.
Frequently asked questions
- What does the seed value do?
- The seed drives the pseudo-random variation in the blob's shape. The same seed always produces the same blob, so you can reproduce a design exactly, while a different seed gives you a new shape.
- Why use SVG blobs instead of image files?
- SVG blobs are vector-based, so they scale to any size without blurring or pixelation, have very small file sizes, and can be recolored or animated with CSS at no extra cost.
- How do I make a blob more or less complex?
- Increase the number of control points and the randomness factor for a more irregular, wavy edge, or reduce them for a calmer, near-circular shape.
- Can I use a blob to mask an image?
- Yes. Use the generated SVG path as a CSS clip-path or an SVG clipPath to crop a photo into the blob shape. Match the path's aspect ratio to the image to avoid awkward cropping.
- Can I fill a blob with a gradient?
- Yes. Set the SVG fill to a gradient definition (linearGradient or radialGradient) or apply a CSS gradient background, which pairs well with output from the Gradient Generator.
Build CSS gradients with live preview and export-ready CSS
Create seeded SVG wave backgrounds and dividers
Create rough drawings and export them as PNG
Generate coordinated color palettes from a seed color
Check foreground and background contrast against WCAG thresholds