How to Cache SVG Files — HTTP Headers and CDN Strategy
Cache SVG files efficiently — HTTP Cache-Control headers, content hash filenames for cache busting, and CDN configuration for fast SVG delivery.
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HTTP Cache Headers for SVG
SVG files are cacheable static assets. Set `Cache-Control: public, max-age=31536000, immutable` for versioned SVG assets (hashed filenames). For non-versioned SVG, use `Cache-Control: public, max-age=86400` (24 hours). SVG logos and icons rarely change — long cache times are appropriate.
- Hashed SVG files: `Cache-Control: public, max-age=31536000, immutable`
- Non-hashed SVG: `Cache-Control: public, max-age=86400, stale-while-revalidate=604800`
- Ensure correct MIME type: `Content-Type: image/svg+xml`
SVG Sprite Caching Strategy
SVG sprite files (all icons in one SVG) are fetched once and cached for the entire session. A single SVG sprite cache hit replaces dozens of individual icon HTTP requests. Set long cache times on the sprite file and version it with a content hash (icons.abc123.svg) to enable instant updates when icons change.
- Single cache: one sprite request serves all icons across all pages
- Content hash: `icons.abc123.svg` changes when any icon changes
- Preload: `<link rel='preload' href='/icons.svg' as='image' type='image/svg+xml'>`
Frequently Asked Questions
Should SVG files have a different cache strategy than PNG/JPG?
SVG files should generally be cached longer than photos since they change less frequently and are used for UI elements (icons, logos). Use the same content-hashing + long-cache strategy as other static assets: hash the filename, set `immutable` cache headers, and cache-bust by deploying new hashed filenames.
How does Next.js handle SVG caching?
Next.js serves static SVG from /public with long-term Cache-Control headers automatically. For SVG in the /public directory: `Cache-Control: public, max-age=31536000`. For SVG imported as modules (with next-svgr): processed at build time, bundled and hashed, served with immutable cache headers.
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