SVG Optimizer — Minify, Clean, Shrink SVG Files (SVGO-Powered)
Optimize SVG files — strip metadata, collapse paths, remove hidden elements. Typically 40-70% size reduction with no visual change. Free.
About 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
- Paste SVG markup or drag-drop a `.svg` file. Multiple files can be queued for batch optimization.
- Choose an optimization preset. Default (safe, no visual changes), Aggressive (drops more metadata, may affect rendering of edge cases), Custom (toggle individual rules).
- Optionally enable specific transformations. Round numeric precision (3 decimals → 2 decimals saves ~10%); remove `viewBox` (not recommended); convert shapes to path; merge paths.
- Click Optimize. The tool runs each enabled rule in sequence and shows the byte count before/after with a percentage saved.
- 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.
Pro 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.
Reviewed by Ahsan Mahmood · Last updated 2026-05-05 · Part of ZTools.
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