CleanorTools
SVG

SVG Optimizer

Details

How to use SVG Optimizer

What the tool does, how to run it, and what to expect from the result.

How to optimize and minify an SVG

To optimize an SVG, upload the file or paste the raw markup into the SVG Optimizer. It removes export metadata, comments, empty groups, and redundant attributes, compacts the markup, and shows the before-and-after size so you can see how much you saved before downloading.

Because the SVG Optimizer runs client-side in your browser, your file is never uploaded. That keeps cleanup private and instant, with no signup, and works equally well whether you paste markup from an editor or drop in a .svg file.

  • Upload an .svg file or paste markup
  • Remove metadata, comments, and empty groups
  • Minify and compact the markup
  • Compare original vs optimized size, then download

Why optimizing SVG markup matters

SVG often looks lightweight until export metadata, comments, empty groups, and redundant attributes pile up and bloat the file. That extra weight slows page loads and clutters inline markup. The SVG Optimizer keeps the cleanup focused and local so files ship lean.

Smaller, cleaner SVG also reads better in code reviews and diffs, since the markup is free of editor noise. The goal is to make the file lighter without changing how it renders, so what you see after optimizing matches the original.

Tips

Getting a better result out of SVG Optimizer

Specific settings and thresholds, not general advice.

  • The optimizer runs SVGO's preset-default with multipass on, but with removeViewBox switched off. That single override is why the output stays responsive: strip the viewBox and the SVG can no longer scale inside a CSS-sized box.
  • cleanupIds is enabled, so ids inside the file get shortened or dropped when nothing references them. If your CSS, your JS, or an external <use href="#icon-name"> points at an id inside this SVG, check those references after optimizing.
  • convertStyleToAttrs rewrites style="fill:#111" into fill="#111". Presentation attributes sit lower in the cascade than inline style, so an external stylesheet that used to lose to the inline style will now win. That is usually what you want in an icon system, but it is a behaviour change.
  • Anything inside <script> or <foreignObject> is removed before optimization by the sanitizer. An interactive or JS-driven SVG loses that behaviour here, so run this only on static graphics.
  • SVGO's default numeric precision is 3 decimal places, which is where most of the size win on a hand-exported illustration comes from. If your artwork uses a viewBox smaller than about 24 units, that rounding is visible, so optimize on the large artboard and scale down in CSS.
Limits

What SVG Optimizer does not do

The honest boundary, so you do not lose time finding it yourself.

  • One SVG per run. There is no batch queue and no folder input.
  • It does not simplify path geometry. Node count and curve complexity come out the same as they went in.
  • It cannot repair broken markup. An SVG that fails to parse is rejected rather than patched.
  • It does not rasterize, recolor, or resize. Those are separate tools.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Files & formatsSVGSVG (.svg) is a vector image format that stores shapes as math rather than pixels, so it scales to any size without losing sharpness. For logos and icons it is usually tiny, but it is unsuited to photographs, which it cannot represent efficiently.General
At a glance

Who SVG Optimizer is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Designers, frontend teams, and founders cleaning editor-exported SVGs before shipping them to the web.

Ideal for

Reducing SVG markup size and stripping editor junk without opening a broader vector editor.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Does optimizing change how the SVG looks?

No. The SVG Optimizer cleans and minifies the markup without changing how the file renders, so the optimized SVG should look the same as the original.

Can I paste SVG code instead of uploading a file?

Yes. The tool supports both file upload and paste-first SVG markup, so you can optimize code copied directly from an editor.

Does it upload my SVG to a server?

No. The SVG Optimizer runs entirely in your browser, so your file stays on your device and is never uploaded.

Is the SVG Optimizer free?

Yes. It is completely free with no signup, and it works fully offline in your browser once the page is loaded.

Why is the output all on one line?

The serializer is set to no pretty printing and zero indentation, so whitespace between attributes and elements is gone. That is the right shape for a file you ship, because gzip and Brotli work on the compact form. If you need to read a diff, run it through your formatter after export.

Will the optimized SVG look identical?

Visually yes for static artwork, because the plugin set is limited to lossless cleanup plus 3-decimal numeric rounding. The two cases where behaviour can change are ids that other code depends on, and inline styles converted to presentation attributes that external CSS can now override.

Is my file uploaded anywhere?

No. The markup is parsed, sanitized, and optimized entirely in your browser tab. Nothing is sent to a server, which also means it is safe to paste unreleased brand assets into the textarea.

How much smaller should I expect the file to get?

It depends almost entirely on where the SVG came from. Editor exports from Illustrator, Figma, Sketch, and Inkscape carry metadata, comments, editor namespaces, and empty groups, and those often make up a large share of the bytes. An SVG that was already hand-written or already passed through SVGO may barely shrink.

Does it remove the width and height attributes?

No. The optimizer keeps width, height, and viewBox. If you want width and height gone so the icon sizes itself from CSS, use the Inline SVG Cleaner, which runs the same optimization and then drops those two attributes.

Can I paste markup instead of uploading a file?

Yes. Paste into the SVG markup box and press Use pasted SVG. The paste path is the faster one when you are copying straight out of a design tool or a component file.

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