Category: Free Tools

For repeating decorative backgrounds, the choice in 2026 is between three approaches: pure CSS gradients (smallest, geometric only), SVG patterns (vector-perfect, complex shapes), or PNG tiles (legacy fallback). SVG wins when your shape is anything more complex than dots and stripes — hexagonal grids, isometric blocks, scaled fish-scales, abstract logos repeated. SVG patterns are also CSS-variable-friendly: change a single CSS custom property and the entire tiled pattern re-colors without regenerating the asset.

Our SVG pattern generator ships 60+ tested patterns with size, color, and density controls. Outputs three forms: standalone .svg file (use as background-image: url(...)), Base64 data URL (inline in CSS), or PNG export (legacy fallback). Patterns are seamless — the right edge meets the left edge cleanly, the top meets the bottom — so any tile size repeats without visible seams. This guide explains how SVG patterns are constructed, when SVG beats CSS or PNG, and the gotchas with anti-aliasing at tile boundaries.

SVG vs CSS vs PNG patterns

If your pattern can be expressed as gradients (dots, lines, grids), use CSS — smallest payload. If it’s geometric but more complex than gradients allow (triangles, hexagons), use SVG. If it’s photographic or organic (paper texture, fabric weave), use PNG.

SVG pattern anatomy

A typical SVG pattern is a repeating tile defined inside a <defs> block, then referenced as a fill:

<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%">
  <defs>
    <pattern id="dots" x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse">
      <circle cx="10" cy="10" r="2" fill="#635BFF"/>
    </pattern>
  </defs>
  <rect width="100%" height="100%" fill="url(#dots)"/>
</svg>

The <pattern> element defines a 20×20 tile with a single circle at the centre. The outer rectangle fills the entire SVG with that pattern. Change pattern dimensions, fill colour, or geometry — the pattern updates automatically.

How to generate an SVG pattern

1. Open the SVG pattern generator
2. Pick a shape from the gallery (60+ options across 5 categories)
3. Adjust tile size, foreground color, background color, and density
4. Watch the live preview render the seamless tile
5. Export: standalone SVG file, Data URL (CSS-ready), or PNG rasterized at chosen resolution

Using SVG patterns as CSS backgrounds

Two ways to include an SVG pattern in CSS:

• External file: background: url("/patterns/dots.svg") repeat; — saves a separate request, cacheable, scales with browser zoom.
• Inline data URL: background: url("data:image/svg+xml;utf8,<svg...>") repeat; — no extra request, theme-able with CSS variables.

For one-off patterns, inline data URLs save a round-trip; for patterns reused across many pages, external files cache better. For maximum flexibility, use a CSS variable for the pattern’s primary color: the data URL references it via fill="currentColor" or accepts injected colors via background-image stacking.

60+ shapes shipped with the generator

• Dots: uniform grid, scattered, halftone, polka, large/small mix
• Triangles: equilateral, scalene, isometric grid, chevron, sawtooth
• Hexagons: honeycomb, beehive, isometric, soccer-ball-style
• Lines: diagonal, crosshatch, sketchy, double-line, wave
• Scales: fish, dragon, oversized, miniature
• Geometric: circles, squares, plus signs, asterisks, stars, arrows
• Floral: abstract flower tile, art-deco fan
• Tech: circuit traces, schematic, blueprint grid

Common gotchas

• Anti-aliasing at seams. If your shape touches the edge of the tile, anti-aliasing can produce visible vertical or horizontal lines where tiles meet. Add 1px padding inside the tile (so shapes don’t touch the edge) or use SVG’s shape-rendering: crispEdges.
• Data URLs need careful escaping. Inline SVG in CSS data URLs needs URL encoding (%, #, ", etc.). Use ? as a safe alternative for < if your CSS toolchain breaks. Our generator outputs already-escaped data URLs.
• Vector but not infinite. SVG patterns scale with display zoom but the pattern tile size is fixed in the generator output. To make tiles scale with viewport, use CSS background-size: 5vw 5vw or similar — but that distorts the pattern.
• Custom fonts in patterns don’t work. If your pattern uses text glyphs (e.g., a tiled “★” character), include the font definition inline via @font-face in the SVG itself, or use SVG path data for the character. External font files won’t load in SVG-as-image contexts.
• Pattern size affects performance. Tiny tiles (under 8×8) render slower than larger ones because the GPU has to repeat them more times. For very fine patterns, use a 32×32 tile with multiple instances inside.
• Background-attachment: fixed + SVG patterns. Patterns repeat strangely with background-attachment: fixed on some browsers. Test before deploying parallax-style background effects.

When NOT to use an SVG pattern

For simple geometric patterns (dots, lines, grids), use CSS gradients — smaller payload, same effect. For photographic or organic textures (paper, fabric, watercolor), use a PNG with proper compression. For animated patterns (drifting, morphing), use a CSS animation on the SVG itself or a canvas-based approach. For very large patterns where the tile is 1000×1000+, you’re better off with a real image — at that size SVG offers no advantage over PNG. For extremely tight performance budgets, even a small SVG pattern adds 500–1500 bytes; CSS gradients add 80.

Frequently asked questions

Are SVG patterns faster than PNG?

For most simple shapes: yes, smaller and faster. For very complex patterns or photographic-quality textures: no, PNGs (especially WebP or AVIF) compress better. Rule of thumb: if the pattern is geometric, SVG; if it’s organic, raster.

Can I edit the SVG pattern after generating?

Yes — the output is plain SVG markup. Open in any text editor, change fill values, adjust shapes inside the <pattern>, scale the tile dimensions. Or import into Figma / Illustrator / Inkscape for visual editing.

Will the pattern look the same on retina displays?

Yes — SVG is vector, so it renders pixel-perfect at any DPI. PNG patterns need 2× / 3× variants for retina; SVG doesn’t.

Can I use CSS variables for pattern colors?

Inside an SVG file referenced via external URL, CSS variables don’t propagate. For inline data URLs in your CSS, use currentColor in the SVG fills, then set color on the parent element to control the pattern’s primary color. For full theme support, generate the pattern programmatically and inject CSS variable values.

Is my data uploaded?

No. The generator runs in your browser. Pattern selections, customisations, and the generated SVG/PNG/data URL stay on your device.

Can I use these patterns commercially?

Yes — the generated SVG is your output, no attribution required. The shape templates are designed for any use including commercial work. The exception: if you upload your own custom shape and the original asset has licensing restrictions, those carry over to the generated pattern.

Related tools and guides

• SVG Pattern Generator
• CSS Pattern Generator
• SVG Blob Generator
• SVG to PNG Converter
• All image tools

Blobs are the visual mascot of late-2010s design — the Stripe, Notion, and Headspace school of organic shapes that fill awkward white space without looking like clip art. They work because the eye reads them as friendly and distinct from the rectangles that make up most of a UI. The trick is producing random-but-not-too-random curves: too uniform and the blob looks like a cookie-cutter circle; too chaotic and it looks like an inkblot.

Our SVG blob generator uses a noise-perturbed circle algorithm — start with N evenly-spaced points around a circle, perturb each radius by a controlled amount of noise, and connect the points with smooth cubic Bezier curves. Adjust complexity (number of points, 3 to 12) and randomness (how much each point can move). Lock a seed value to reproduce the exact shape, or shuffle for a fresh variation. Outputs SVG (preferred for scaling) or PNG with transparent background.

When blobs work — and when they don’t

How blob shapes are generated (the algorithm)

The simplest blob algorithm: pick N points evenly around a circle (e.g., N=8 means one point every 45°), add or subtract a random amount from each point’s radius (e.g., ±15%), then connect the points with a smooth Catmull-Rom or cubic Bezier spline. The result is a closed organic shape.

Two parameters control the look:

• Complexity (point count): 3–4 produces simple organic shapes; 6–8 the typical “blob” appearance; 10–12 starts to look bumpy. Higher counts approach a circle.
• Randomness (radius variance): 0% returns a perfect circle; 15% gives the typical Stripe-style blob; 50%+ produces dramatic, almost star-like shapes; 80%+ gets weird.

The “seed” is the random number generator initial value. Same seed + same parameters always produces the same blob — useful for reproducible designs and storing a specific shape in a stylesheet.

How to generate a blob in your browser

1. Open the SVG blob generator
2. Adjust complexity (points), randomness (variance), and size
3. Pick fill — solid colour, linear gradient, or radial gradient
4. Click Shuffle for a new random shape, or paste a seed string for a specific one
5. Click Copy SVG for inline use, Download SVG for asset library, or Download PNG for legacy systems

SVG output anatomy — what you’ll paste

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <path
    d="M150,100 C170,140 130,180 100,170 C70,180 30,150 30,100 C20,60 60,30 100,30 C140,20 160,60 150,100 Z"
    fill="#635BFF"
  />
</svg>

The viewBox="0 0 200 200" defines a coordinate system; the actual rendered size is set by CSS or the width/height attributes. Inline the SVG to style the blob with CSS variables, or reference an external file via <img src="blob.svg">.

Common gotchas

• Don’t animate blob shape directly. CSS animation between two SVG paths needs equal point counts; otherwise the morph fails or looks broken. Use the same complexity for the start and end blob, only varying the seed.
• Fill colour vs stroke colour. Most decorative blobs use only fill (no border). If you add a stroke, the path must be closed (ending in Z) — the generator handles this, but custom-edited blobs may render with a thin gap.
• SVG sizing pitfalls. Set width and height via CSS (.blob { width: 100%; height: auto; }) — hard-coded width/height attributes don’t scale with parent containers.
• Gradients need <defs>. Linear and radial gradients in SVG live inside a <defs> element and reference an ID. Generated SVG includes the defs — but if you copy only the path and forget the gradient definition, the blob renders solid black.
• Same seed across browsers. JavaScript’s Math.random() isn’t seeded by default, so two browsers running the same generator can produce different blobs. We use a seedable PRNG (xoroshiro128+) for reproducibility.
• Blob trends fade. The blob aesthetic peaked around 2020. By 2026 some brands are returning to grids, geometric patterns, or gradient meshes. Don’t blob everything — use sparingly as one design element among many.

When NOT to use a blob

For a brand identity (logo, mark, lockup), don’t use random blobs — your brand needs a consistent shape that can be reproduced exactly across business cards, app icons, billboards, and embroidery. For functional UI shapes (modal corners, button radii, container shapes), use plain border-radius or clip-path with named values — blobs are too distracting for primary UI elements. For animations between many shapes, use a dedicated motion library (Framer Motion, GSAP) with proper SVG morph plugins. For data visualisation, blobs are decoration, not data.

Frequently asked questions

Can I edit the blob after generating?

Yes — the SVG path is just a string of cubic Bezier commands. Edit the d attribute manually for fine-tuning, or import the SVG into Figma / Illustrator / Inkscape for visual editing. To re-randomise within the generator, change the seed.

Will the same seed produce the same blob across browsers?

Yes — we use a deterministic PRNG (xoroshiro128+), so the same seed and same parameters produce identical SVG everywhere. Useful for reproducible designs.

Can I animate between two blobs?

Yes, but both blobs must have the same point count for smooth interpolation. Generate both with the same complexity setting and only change the seed; the animator can morph between the two paths. CSS path animations or libraries like GSAP MorphSVG handle this.

Should I use SVG or PNG?

SVG for web — vector scales without loss, has CSS-controllable fill, and is tiny (often under 1 KB). PNG for legacy systems that don’t render SVG (some older email clients, very old CMS plugins). PNG output is rasterised at 2× resolution by default for retina displays.

Is my data uploaded?

No. The generator runs in your browser. The blob shape, seed, and exported SVG/PNG never leave your device.

Can I use blobs in print or for stickers?

Yes — SVG scales infinitely, perfect for stickers, business cards, or large-format print. Convert to PDF or AI in your design tool of choice; the source SVG paths are widely supported.

Related tools and guides

• SVG Blob Generator
• CSS Clip Path Generator
• CSS Border Radius Generator (organic radii)
• SVG to PNG Converter
• All image tools