SVG Data URI Encoder
Paste raw SVG markup and convert it instantly into a Data URI for CSS or HTML. Preview the encoded graphic and copy the output in one click.
All processing happens locally in your browser — nothing is stored or sent to any server.
How to Encode SVG as a Data URI
- Paste your SVG code into the input area.
- Check the preview to make sure the image still renders correctly.
- Copy the generated Data URI or the CSS background-image snippet.
- Paste the result into your project wherever you need an inline asset.
About SVG Data URIs
Data URIs (RFC 2397) let you embed small files directly into CSS or HTML, eliminating a separate HTTP request. For SVG icons specifically, this is a meaningful performance win when the icon is only used once or twice — you save the round-trip latency that would otherwise be needed to fetch the .svg file. Inlined SVGs also render with the rest of the page rather than appearing slightly later, which improves perceived load time on slow connections.
SVG markup contains characters that have special meaning in URL contexts: angle brackets (< >) define tags, quotes delimit attributes, the hash symbol (#) starts URL fragments, and the percent sign (%) introduces URL-encoded sequences. Inserting raw SVG into a CSS url() or img src attribute will frequently break — the browser tries to parse the SVG as URL syntax and fails. Proper encoding sidesteps this by replacing dangerous characters with safe equivalents.
This encoder uses URL-encoding (percent-encoding) which produces ~30% smaller output than Base64 and remains partially human-readable. For SVG payloads up to about 5KB, this is the recommended approach. For larger SVGs, switch to a separate file with proper HTTP caching — Data URIs disable caching at the asset level. All conversion happens locally in your browser; nothing is uploaded.
Frequently Asked Questions
What is a Data URI? ▼
A Data URI is a URL scheme (defined in RFC 2397) that embeds the actual contents of a file directly inside a URL-like string. Instead of "https://example.com/icon.svg", you get "data:image/svg+xml,..." with the SVG markup inline. This eliminates the separate HTTP request for small assets.
Can I use the result in CSS? ▼
Yes. The tool provides a ready-made background-image CSS snippet you can paste directly into a stylesheet: background-image: url("data:image/svg+xml,..."). This works for all CSS properties that accept URL values — background-image, list-style-image, mask-image, etc.
Can I use the result in an img tag? ▼
Yes. The generated Data URI works as the src attribute of an img tag: <img src="data:image/svg+xml,..." alt="">. This is useful for inlining icons in HTML emails, reducing the number of attached images.
Why encode SVG at all? ▼
Raw SVG contains characters — angle brackets, quotes, hash symbols, percent signs — that have special meaning in URLs and CSS. URL-encoding (or Base64-encoding) converts these to safe representations. Without encoding, browsers may misinterpret the SVG as malformed URL syntax and fail to render it.
URL-encoding vs Base64 encoding — which is better? ▼
URL-encoding (percent-encoding) produces smaller output for SVG (typically 30-40% smaller than Base64) and remains human-readable. Base64 is sometimes simpler to handle programmatically but adds ~33% size overhead. For SVG specifically, URL-encoding is the modern best practice and what this tool produces.
When should I NOT use Data URIs? ▼
Avoid Data URIs for assets larger than ~5KB — they prevent browser caching (every page reload re-parses the inline data), bloat HTML/CSS file sizes, and slow first paint. They are best for tiny icons, decorative shapes, and one-off graphics. For larger assets or anything used on multiple pages, a separate file with proper caching is faster.
Do Data URIs work in all browsers? ▼
SVG Data URIs work in every modern browser (Chrome, Firefox, Safari, Edge) and IE 9+. They work in CSS and HTML contexts equally well. The only edge case: some older email clients block external images by default but allow Data URIs, which makes them useful for HTML email design.
Is the SVG uploaded? ▼
No. The encoding, preview, and copy operations all run in your browser using JavaScript. Your SVG markup never leaves your device — useful when working with proprietary or unreleased graphics.