How to Serve SVG from a CDN — Configuration and Best Practices
Serve SVG files from a CDN — correct MIME types, cache headers, Brotli compression, and CDN configuration for fast global SVG asset delivery.
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CDN Configuration for SVG Files
Configure your CDN (Cloudflare, Fastly, CloudFront) to serve SVG with the correct MIME type (`image/svg+xml`) and long cache headers. Many CDNs default to treating unknown extensions as `application/octet-stream` — explicitly configure SVG to serve with the correct MIME type or browsers may not render it.
- MIME type: configure CDN to serve .svg as `image/svg+xml`
- Cache headers: `Cache-Control: public, max-age=31536000, immutable` for hashed SVGs
- Compression: enable Brotli or gzip compression — SVG is text, compresses 70-85%
SVG Compression for CDN Delivery
SVG files are XML text and compress extremely well — a 10KB SVG often compresses to 2-3KB with Brotli. Enable Brotli or gzip compression on your CDN for all SVG files. Pre-compress SVG as `.svg.br` and `.svg.gz` at build time to serve pre-compressed files without per-request CPU cost.
- Brotli: `brotli --best icons.svg -o icons.svg.br`
- gzip: `gzip -9 -k icons.svg` for .gz fallback
- Verify: `curl -H 'Accept-Encoding: br' https://cdn.example.com/icon.svg -I`
Frequently Asked Questions
Should SVG files be served from a CDN or inline in HTML?
For critical above-fold SVG icons: inline in HTML to eliminate the HTTP request entirely. For large illustrations, below-fold SVG, and SVG reused across pages: serve from CDN with long-term caching. The tradeoff is HTTP request overhead vs. HTML payload size and browser caching.
Can I host SVG files on GitHub and use them as CDN?
GitHub's raw content (raw.githubusercontent.com) is not a CDN — it's rate-limited and has no edge caching. For production SVG hosting, use jsDelivr (which mirrors npm packages and GitHub with CDN), Cloudflare Pages, or Netlify for proper CDN delivery with edge caching.
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