SVG optimizer

What is an Svg Optimizer?

SVG files exported from design tools such as Illustrator, Figma, Sketch and Inkscape contain a lot of data the browser does not need: editor metadata, comments, unused definitions, default attribute values and coordinates with excessive precision. Optimizing removes it, often reducing file size by 30 to 70% with no visible difference.

How to use it

  1. Paste SVG markup or load an SVG file.
  2. Run the optimization.
  3. Compare the size and preview, then copy or download the optimized SVG.

What gets removed or simplified

  • XML declarations, comments and DOCTYPE.
  • Editor namespaces and metadata, such as inkscape:, sodipodi: and Illustrator data.
  • Empty groups, hidden elements and unused defs.
  • Default attribute values, such as fill-opacity='1'.
  • Unnecessary whitespace and excessive decimal precision in path data.

Example

A simple icon exported at 4.2 KB with metadata, a title, nested groups and coordinates such as 12.000000 can shrink to under 1 KB, while rendering identically.

What to keep

  • viewBox: removing it breaks scaling. Keep it and remove fixed width and height instead if the icon should scale with CSS.
  • IDs referenced by CSS or JavaScript, or used by gradients and masks.
  • title and aria attributes for meaningful images, for accessibility.

Tips

  • Always preview the result; aggressive precision reduction can slightly distort detailed paths.
  • For build pipelines, SVGO is the standard tool and can run automatically.
  • Inline small icons in HTML or use an SVG sprite to reduce requests.

Frequently Asked Questions

How much smaller does SVG optimization make files?

Often 30 to 70 percent for files exported from design tools, depending on how much metadata they contain.

Will optimization change how my SVG looks?

Normally no. Very aggressive precision settings can slightly alter detailed paths, so always check the preview.

Should I remove the viewBox attribute?

No. The viewBox is needed for scaling. Removing width and height while keeping viewBox makes SVGs responsive.

What tool can optimize SVGs in a build pipeline?

SVGO is the standard command-line and Node.js tool for automatic SVG optimization.

You May Also Need