SVG ID Optimizer — Short IDs with Auto-Updated References

2025.11.12

How to Use

  1. Input
    • Paste your SVG source into the textarea or choose an SVG file.
  2. Option
    • Remove unused IDs: when checked, drops id attributes that appear unreferenced.
  3. Run
    • Click Optimize → preview shows below; optimized source appears in the code box.
  4. Export
    • Copy the optimized code, or Download as optimized.svg.

Outputs / Results

  • SVG with shortened IDs (a, b, …, aa …).
  • Updated references in url(#id) / href / xlink:href / fill / stroke / filter / clip-path / mask / marker-*.
  • Replacements inside <style> and inline style for url(#id) / #id.
  • Optional removal of unused IDs.

[Completely Free] Utility Tools & Work Support Tools

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Notes / Caveats

  • CSS selectors using IDs: rules like #logo { ... } are not considered in the “unused” check.
    • Either disable “Remove unused IDs” or verify the layout after optimization.
  • Color-code collisions: if an ID equals a color literal like #abc, replacing #abc inside CSS may corrupt colors. Short, color-like IDs are risky.
  • Script safety: preview injects SVG via innerHTML. Untrusted SVG may contain <script>; use with trusted assets only.
  • Detection scope: the unused check focuses on attribute references and url(#...). SMIL/complex CSS references might be missed.
  • ID quota: short ID generator covers tens of thousands of IDs (a…zzz); extremely large documents may exceed this.
  • Browser support: relies on modern features (replaceAll, etc.); older browsers may not work.
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