A practical guide on svg favicons — when, why, and how.
Modern browsers support SVG favicons, allowing a single file to display a crisp icon at every size — from the 16×16 browser tab to the 180×180 iOS home screen.
Why SVG Favicons?
Traditional favicons require multiple PNG files at different sizes (16, 32, 48, 180 pixels). An SVG favicon is one file that renders perfectly at all sizes. It also supports dark mode via CSS prefers-color-scheme media queries.
How to Implement
Add to your HTML <head>:
<link rel="icon" href="/favicon.svg" type="image/svg+xml">
Keep a PNG fallback for older browsers:
<link rel="icon" href="/favicon.png" type="image/png">
Creating an SVG Favicon
If your logo is currently a PNG, convert it to SVG. Then simplify it for small display sizes — remove fine details, use bold shapes, ensure it reads clearly at 16×16. Test by viewing the SVG at 16px, 32px, and 180px to verify legibility at each size.
Dark Mode Support
Add a <style> block inside your SVG to swap colors based on the user's color scheme preference — a unique advantage SVG favicons have over PNG.