SVG Compression Methods Compared — SVGZ, Gzip, Brotli & SVGO
Combine SVGO minification with HTTP Brotli compression for maximum SVG delivery speed — compare SVGZ, server compression, and file-level optimization.
SVGO File Minification
SVGO reduces SVG file size by removing unnecessary content: editor metadata, comments, redundant attributes, and over-precise decimals. This reduces the uncompressed file size. Run SVGO first before any compression — smaller input means smaller compressed output.
- SVGO --multipass: typically 30–60% file size reduction
- Reduces source SVG before HTTP compression
- Run as part of build pipeline for production SVG
HTTP Compression: Gzip vs Brotli vs SVGZ
SVGZ is a pre-compressed SVG (gzip format) — useful when the server doesn't auto-compress. HTTP gzip (Content-Encoding: gzip) compresses on-the-fly and is universally supported. Brotli (Content-Encoding: br) achieves 15–25% better compression than gzip for text-based formats like SVG. Use Brotli when your CDN/server supports it.
- SVGZ: pre-gzipped SVG, use with .svgz extension
- Gzip: universal HTTP compression, ~70% on top of SVGO
- Brotli: 15–25% better than gzip, modern CDNs support it
Frequently Asked Questions
What is the best way to compress SVG for web delivery?
SVGO minification + HTTP Brotli compression is the optimal combination. SVGO reduces the source file 40–60%, then Brotli adds another 60–75% on-the-wire compression. Total delivery size can be 85–95% smaller than the original Illustrator SVG.
Should I use SVGZ files on my web server?
SVGZ is useful if your server doesn't auto-compress static assets. If your CDN or server already serves Brotli/gzip for text files, stick with plain .svg — let the server compress at delivery rather than serving pre-compressed SVGZ.
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