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SVG Optimization Techniques That Actually Make a Difference

SVGs are the best format for web icons and illustrations, but unoptimized SVGs are bloated. Here are the optimization techniques I use on every project. SVG is my default format for any graphic that is not a photograph. Icons, logos, illustrations, decorative shapes. All SVG. The format is resolution independent, scales without quality loss, and can be styled with CSS. But SVG files straight from design tools are bloated with metadata, unnecessary attributes, and redundant paths. A five kilobyte icon can balloon to fifty kilobytes before optimization. On a site with forty icons, that is two megabytes of unnecessary data. Strip Metadata First Design tools like Figma, Illustrator, and Sketch embed metadata in SVG exports. Layer names, editor settings, comments, and namespace declarations that the browser does not need. This metadata can account for thirty to fifty percent of the file size. The first optimization step is stripping it all. I use SVGO, a Node.js tool that automatically removes metadata and applies a range of optimizations. Running SVGO on a typical SVG export reduces file size by forty to sixty percent with zero visual change. The tool is configurable, so I can control which optimizations are applied and which are skipped. More guides are on the Spark Blog.