Encode SVG as a CSS data URI for use as background-image. Generates URL-encoded SVG (preferred over base64) for smaller CSS bundles. Works in all modern browsers.
Requires a Pro subscription. Free tier users see the tool but processing is gated.
Tool locked — preview only
Up to 50 MB per file · batch up to 20 files · API + MCP access
Up to 2 GB per file · unlimited batch · runner acceleration · priority MCP
Upload or paste your SVG source
The tool URL-encodes the SVG and wraps it in CSS background-image syntax
Copy the CSS snippet — ready to paste into any stylesheet
0 bytes uploaded. CSS Data-URI Generator runs entirely in your browser using the DOM API and Canvas. Your SVGs never leave your device.
URL-encoding (percent-encoding) is preferred for SVGs. It's typically 5–10% smaller than base64 because SVG characters like < > and = URL-encode efficiently.
SVG data URIs require the SVG to have a valid viewBox and the MIME type must be image/svg+xml. Ensure your SVG doesn't contain double-quoted attributes — use single quotes instead.
Yes. Data URIs are supported in major email clients and avoid external image blocking. This is a common technique for logo backgrounds in HTML emails.
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