ToolHive

SVG to CSS Background Optimizer

Skip the heavy Base64 encoding. Use optimized, percent-encoded SVGs in your CSS.

svg encodersvg to csssvg data urisvg optimizer

Interactive Tool

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Intro

Using Base64 for SVGs inside CSS actually makes the file larger because Base64 has a ~33% size overhead.

This tool uses minimal percent-encoding (replacing only necessary characters like < and >) to give you the most optimized Data URI possible.

How to use

  1. Paste SVG
    Paste your raw <svg> code.
  2. Copy CSS
    Copy the optimized background-image rule.
  3. Use Base64
    Alternatively, use the Base64 output if required by another platform.

Examples

Simple Circle
An optimized circle SVG.
Input
<svg><circle cx='5' cy='5' r='5' fill='red'/></svg>
Output
background-image: url("data:image/svg+xml,...")
CSS background usage
Encoded SVG ready for use as a CSS background-image value.
Input
<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><circle cx="5" cy="5" r="4"/></svg>
Output
background-image: url("data:image/svg+xml,%3Csvg...")

FAQ

What is SVG URL encoding?

SVG URL encoding converts an SVG markup string into a data URI format (data:image/svg+xml,...) that can be used directly in CSS background-image or HTML img src attributes.

Why encode SVGs as data URIs?

Data URI encoding eliminates an extra HTTP request by embedding the SVG inline. This is especially useful for small icons and decorative elements in performance-critical applications.

Are there size limits for SVG data URIs?

Browsers support data URIs up to several megabytes, but for performance, keep SVG data URIs under 10KB. Larger SVGs should be loaded as separate files.

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