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SVG Pattern Generator

Build a seamless SVG tile and copy matching CSS without uploading assets or writing path markup.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Choose a pattern style, tile size, shape width, foreground, and background.
  2. 2.Inspect the repeated preview at approximately the size where the pattern will be used.
  3. 3.Copy the CSS, copy the standalone SVG markup, or download the tile and test it under the destination CSP.

About SVG Pattern Generator

SVG Pattern Generator builds a small vector tile and shows it repeated across a larger preview. Choose dots, grid, diagonal lines, or waves; adjust the tile size and shape width; then select foreground and background colors. The tool produces three synchronized outputs: a live repeated preview, standalone SVG tile markup, and CSS containing a percent-encoded SVG data URL plus matching background size. Everything is generated in the current browser tab, with no asset upload or hosted image dependency.

Tile size controls the repeat interval in both horizontal and vertical directions. A smaller value packs more motifs into the same area, while a larger value leaves more visual space. Shape width changes the dot radius for the dots style and the stroke width for line-based styles. Because those meanings differ, equal numeric values do not guarantee equal perceived weight. Inspect the repeated preview rather than judging the control number alone, especially when foreground and background have strong contrast.

Each style has deterministic geometry. Dots place one circle at the center of the square tile. Grid draws the top and left edges so adjacent copies complete a regular lattice without double-width interior lines. Diagonal creates several parallel segments that cross tile boundaries, allowing neighboring copies to continue the stripe rhythm. Waves use one quadratic curve followed by a smooth quadratic continuation across the tile. Rebuilding with identical controls produces byte-for-byte identical SVG and CSS output.

The SVG includes an explicit width, height, viewBox, full-tile background rectangle, and one motif element. Both colors must be six-digit HEX values and are normalized to lowercase. Tile size accepts integers from eight through 128 pixels, and shape width accepts values from one through twelve pixels. The interface constrains normal input to those ranges, while the pure generator independently rejects unsupported styles, malformed colors, and out-of-range values instead of silently repairing them.

The CSS output uses background-color, background-image, and background-size. The image value contains the exact generated SVG after percent encoding, so it can be pasted without a separate file request. This is convenient for prototypes, small decorative surfaces, placeholders, badges, cards, and controlled site themes. A data URL can still be blocked by a destination's Content Security Policy, sanitizer, email client, or CMS. In that case, download the SVG tile, serve it as an approved asset, and replace the data URL with that asset URL.

Copy CSS and Copy SVG request browser clipboard permission separately. A successful message names the copied format. A denied permission leaves both read-only outputs visible for manual selection and does not claim success. Download SVG Tile saves the same tile shown in the markup field. The preview is not a screenshot and the download is not the large repeated area; it is the single source tile intended to repeat. This keeps the file compact and lets CSS control the covered area.

Seam quality depends on geometry, antialiasing, scaling, and the final rendering environment. Fractional layout scaling or browser zoom can make one-pixel strokes appear uneven. Very large stroke widths can dominate small tiles, and sharply contrasting diagonals may reveal antialiasing differences at boundaries. Test at the final CSS size and device pixel ratio. The tool does not guarantee print registration, texture randomness, perceptual uniformity, accessibility, or compatibility with software that rasterizes SVG differently.

This focused generator does not create photographic textures, noise, checkerboards with independently sized cells, custom path uploads, rotations, gradients, masks, animation, or multi-layer compositions. It also does not minify the SVG beyond concise deterministic markup. Use the related color tools to choose a palette or verify contrast, then keep the original generated settings with your project. W3C SVG 2 describes tiled patterns and vector paint behavior, while MDN documents the pattern element and browser compatibility. This implementation exports a standalone tile used as a CSS background image rather than wrapping the motif in an internal SVG pattern element; the visual repeat is performed by CSS background tiling.

Methodology & sources

Validate a strict style and numeric range, generate one square SVG tile with deterministic motif geometry, percent-encode that exact string into a CSS data URL, and keep preview, markup, CSS, and download synchronized.

Frequently asked questions

Is the downloaded file the whole preview?
No. It is the compact single SVG tile; CSS or a graphics application repeats that tile to cover a larger area.
Why does the CSS use a data URL?
It embeds the exact SVG tile in one declaration so no separate image request is required, although a site's CSP may restrict data URLs.
Will every pattern be perfectly seamless?
The geometry crosses or aligns with tile boundaries, but antialiasing, zoom, fractional scaling, and extreme stroke-to-tile ratios can affect visible seams.
Does it upload or host my pattern?
No. Preview, SVG, CSS, clipboard writes, and download preparation all remain in the current browser tab.

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