SVG to CSS

Convert raw SVG markup into a CSS-ready data URI. Get both the base64 form and the more compact URL-encoded form, a copy-ready background-image declaration for each, the byte size of each encoding so you can pick the smaller one, and a live preview of your SVG.

SVG to CSS is a free tool that turns raw SVG markup into a CSS-ready data URI so you can embed an icon, pattern, or background image directly in your stylesheet with no extra HTTP request. Paste your SVG and the tool generates two encodings at once: a base64 data URI and a more compact URL-encoded data URI. It writes a copy-ready background-image declaration for each, shows the byte size of both so you can pick the smaller one, and renders a live preview of your SVG. Everything runs in your browser, so your markup never leaves your machine.

What is an SVG data URI in CSS?

A data URI lets you inline an image directly inside CSS instead of linking to a separate file. For SVG it looks like a background-image whose url points at a data:image/svg+xml resource, with the SVG either base64-encoded or percent-encoded right in the value. Inlining an SVG this way removes a network request, which is handy for small icons, decorative patterns, and CSS-only graphics. This tool produces both encodings from your pasted markup and formats them as a background-image rule you can paste straight into a stylesheet.

How to convert SVG to a CSS data URI

Turning your SVG into CSS takes only a few steps:

  1. Paste your raw SVG markup into the input box.
  2. Click Convert to CSS to generate both data URI encodings.
  3. Compare the byte size shown next to each encoding.
  4. Check the live preview to confirm the SVG renders correctly.
  5. Copy the URL-encoded or base64 background-image declaration into your stylesheet.

URL-encoded vs base64: which is smaller?

Base64 always inflates data by roughly a third because it represents every three bytes with four characters. URL encoding only escapes the handful of characters that are unsafe inside a data URI, such as angle brackets, the hash, the percent sign, quotes, and whitespace, leaving the rest of the readable SVG text intact. For typical SVGs the URL-encoded form is noticeably smaller and also stays human-readable. This tool reports the byte size of each so you can simply choose the smaller one, and it picks the lighter encoding for the live preview automatically.

Is converting SVG to CSS safe and private?

Yes. The conversion happens entirely in your browser with JavaScript, so your SVG markup is never uploaded to a server. The live preview is rendered by pointing an image element at the generated data URI, which displays the artwork without executing any script inside the SVG, and all output is shown as plain text. Nothing you paste is stored or transmitted.

Why use this SVG to CSS converter?

  • 100% free with no ads, sign-up, or limits.
  • Generates both base64 and URL-encoded data URIs at once.
  • Outputs a ready-to-paste background-image declaration for each.
  • Shows the byte size of each encoding so you can pick the smaller one.
  • Live preview renders your SVG directly from the data URI.
  • Runs entirely in your browser, so your markup never leaves your device.

Frequently asked questions

Is the SVG to CSS converter free?

Yes. Every tool on ToolsSoup is completely free, with no account, sign-up, or hidden limits.

Should I use the base64 or URL-encoded data URI?

For most SVGs the URL-encoded version is smaller and stays readable, so it is usually the better choice. This tool shows the byte size of both encodings, so you can simply pick whichever is smaller for your specific SVG.

Does the data URI work as a CSS background image?

Yes. The tool wraps the data URI in a background-image declaration that you can paste straight into your stylesheet. Data URI backgrounds are supported in every modern browser.

Is my SVG uploaded anywhere?

No. The conversion and preview run entirely in your browser, so the SVG markup you paste is never sent to or stored on any server.