SVG vs ICO Favicon — Modern vs Classic Format Compared
SVG favicons support dark mode, scale perfectly at any size, and are a single file. ICO favicons have broader legacy browser support. Here's when to use each.
Why SVG Favicons Are Better for Modern Sites
SVG favicons scale perfectly from 16px to 192px from a single file. They support CSS media queries (including prefers-color-scheme for dark mode). All modern browsers support SVG favicons.
- Single file serves all sizes from 16px to 512px
- Dark mode: use CSS inside SVG to switch icon appearance
- Smaller file size than multi-size ICO
- Supported: Chrome 80+, Firefox 41+, Safari 12+
- Not supported: Internet Explorer (use ICO fallback)
When to Use ICO Favicons
ICO format bundles multiple resolutions (16px, 32px, 48px) into one file and has universal browser support including Internet Explorer. Use ICO as a fallback alongside SVG for maximum compatibility.
- ICO: required for IE 11 and older legacy browsers
- ICO: some email clients use favicon from ICO
- Best practice: use both SVG (primary) + ICO (fallback)
- <link rel='icon' href='favicon.svg' type='image/svg+xml'>
- <link rel='icon' href='favicon.ico'>
Frequently Asked Questions
Should I use SVG or ICO for my website favicon?
Use both: SVG as the primary (modern browsers) and ICO as a fallback. <link rel='icon' href='favicon.svg'> then <link rel='icon' href='favicon.ico'>.
How do I make a dark mode SVG favicon?
Add a CSS media query inside the SVG: @media (prefers-color-scheme: dark) { path { fill: white; } }. The icon automatically changes color in dark mode.
What size should an SVG favicon be?
SVG is resolution-independent — size doesn't matter. Keep the viewBox square (e.g. viewBox='0 0 32 32') and the browser handles the rest.
Does imagetosvg.com create favicon-ready SVG files?
Yes — convert your icon to SVG, then use the SVG generator tool to create a favicon.svg with proper viewBox settings.
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