Favicon ICO vs PNG — Which Format for Your Site's Icon?
Compare ICO and PNG formats for favicons. Learn what modern browsers support, multi-size considerations, and the simplest favicon setup for 2025.
| Feature | ICO Format | PNG Favicon |
|---|---|---|
| Auto-Discovery | Yes (/favicon.ico) | No (requires HTML declaration) |
| Multi-Size | Yes (in one file) | Multiple files needed |
| Color Quality | Good | Excellent |
| Transparency | Limited | Full alpha channel |
| Browser Support | Universal including old IE | All modern browsers |
| Creation Complexity | Requires ICO tool | Any image editor |
| SVG Option | No | Yes (rel="icon" type="image/svg+xml") |
| Best For | Reliable fallback | Modern web projects |
Verdict
The modern best practice is: a 32x32 favicon.ico in the root (for auto-discovery and IE fallback), a 180x180 apple-touch-icon.png, and an SVG favicon for modern browsers. Don't over-engineer it — most users never consciously look at favicons.
The Modern Favicon Implementation
The recommended modern favicon setup is minimal and straightforward. Place a favicon.ico (containing 32x32 and 16x16 sizes) in your website root — this handles auto-discovery and legacy browsers with zero HTML needed. Add <link rel="icon" type="image/svg+xml" href="/favicon.svg"> in your <head> for modern browsers with a beautiful vector icon. Add <link rel="apple-touch-icon" href="/apple-touch-icon.png"> (180x180 PNG) for iOS home screen icons. This three-file setup handles every real-world scenario without creating dozens of different sized PNG files. The realfavicongenerator.net tool can generate all files from a single source image.
Favicons and PWA Manifest Icons
Progressive Web Apps (PWAs) require additional icon sizes in the web manifest file (manifest.json): typically 192x192 and 512x512 PNG images. These are used when users add your site to their home screen on Android. iOS uses the apple-touch-icon.png defined in HTML rather than the manifest. The manifest icons are distinct from browser favicons — they're larger and used in different contexts (app drawer, splash screens). For PWAs, ensure your manifest references the correct paths and that the PNG files are actually high-quality at those dimensions, not just upscaled small images.
Frequently Asked Questions
The minimum is 16x16 (for browser tabs). Recommended sizes: 16x16 and 32x32 in the ICO file, 180x180 for Apple Touch Icon, 192x192 and 512x512 for PWA manifest. In practice, creating a clean, simple icon at 32x32 that scales well covers 95% of cases.
Yes, practically speaking. Without a favicon, browsers make a 404 request for /favicon.ico which appears in your server logs and slightly impacts page load. Browsers show a generic icon in the tab, which looks unpolished. A basic favicon is a minimal effort for a noticeably more professional result.
SVG favicons are declared with <link rel="icon" type="image/svg+xml" href="favicon.svg"> and display perfectly at any size since SVG is vector-based. They also support CSS media queries — your favicon can have different colors in dark mode. Supported in Chrome, Firefox, and Safari (WebKit). Use with an ICO fallback for older browsers.