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svg-optimizer

An SVG optimizer parses an SVG file and re-emits it with every safe size-saving transformation applied: stripping editor-specific metadata (Adobe Illustrator and Sketch leave a lot of cruft), removing hidden elements, collapsing nested groups, rounding numeric precision, removing default attribute values, and minifying whitespace. The ZTools SVG Optimizer uses an SVGO-equivalent ruleset to typically achieve 40-70% size reduction with zero visual change. Output is production-ready: smaller payloads, faster page loads, and cleaner markup that's easier to inline or animate.

Use cases​

Cleaning up icon-set SVGs exported from Figma or Illustrator​

Designer hands you 30 icons exported from Figma — each is 2-5 KB with embedded metadata, default attributes, and unused styles. Optimize the batch to ~600 bytes each, often 70% smaller. Faster icon-font replacement, better caching.

Preparing SVGs for inline use in React or HTML​

Inline SVG (instead of <img src>) lets CSS style the SVG (color, hover effects). Optimization removes all the noise that makes inline SVG bloat your HTML, while preserving the styleable structure.

Reducing the size of an SVG-heavy hero illustration​

Decorative SVG illustrations can balloon to 50+ KB unoptimized. Optimization typically cuts that to 15-20 KB — meaningful for above-the-fold content where every KB delays LCP.

Validating that exported SVGs are well-formed​

Optimization includes a parse step that fails on malformed SVG. A successful optimization is a strong signal that your SVG is valid and renderable across browsers.

How it works​

  1. Paste SVG markup or drag-drop a .svg file — Multiple files can be queued for batch optimization.
  2. Choose an optimization preset — Default (safe, no visual changes), Aggressive (drops more metadata, may affect rendering of edge cases), Custom (toggle individual rules).
  3. Optionally enable specific transformations — Round numeric precision (3 decimals → 2 decimals saves ~10%); remove viewBox (not recommended); convert shapes to path; merge paths.
  4. Click Optimize — The tool runs each enabled rule in sequence and shows the byte count before/after with a percentage saved.
  5. Copy or download the optimized SVG — Side-by-side preview confirms no visual change. Download as .svg or copy as inline markup.

Examples​

Input: Figma-exported icon: 2,400 bytes with metadata, default attributes

Output: Optimized: 720 bytes (70% reduction), pixel-identical render

Input: Hand-coded SVG with floating-point precision 6 decimals

Output: Optimized to 2-decimal precision, 30% size reduction, no visible change

Frequently asked questions​

Will optimization change how my SVG looks?

With the default preset, no — every transformation is "safe" and visually invariant. Aggressive mode may affect edge cases (very thin strokes at sub-pixel positions, complex filters); always preview before deploying.

What does the optimizer actually remove?

Editor metadata (XML namespaces from Illustrator/Sketch), <title> and <desc> (unless you opt to preserve for accessibility), default attribute values, hidden elements, empty groups, comments, and excess whitespace.

Should I keep <title> for accessibility?

Yes when the SVG conveys meaning. The optimizer preserves <title> by default; only remove for purely decorative SVGs (icons that are described by adjacent text).

Why is viewBox important?

viewBox defines the SVG's coordinate system and aspect ratio. Removing it breaks scaling. The optimizer never removes viewBox by default.

Can I optimize SVG with embedded raster images?

Yes — embedded <image> references stay intact. To compress the embedded raster itself, use our Image Compressor before embedding.

Does the tool work offline?

Yes — once loaded, optimization runs entirely in your browser.

Tips​

  • For icon sets, batch-optimize all icons in one run — saves significant total size for the set.
  • Always preview the optimized SVG before deploying — catches the rare visual regression.
  • For inline SVG, optimization is even more impactful because every byte ships in HTML.
  • Keep <title> for accessibility on meaningful SVGs; remove for purely decorative icons.

Try it now​

The full svg-optimizer runs in your browser at https://ztools.zaions.com/svg-optimizer — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub