Favicons in 2026: The Technical Guide to .ICO Format

The favicon is the small icon displayed in the browser tab. While SVG is increasingly used, .ICO format remains the only one capable of grouping several resolutions into a single file for full compatibility (especially with old Windows systems). **Multi-layer Structure**: A good favicon.ico file generated by PulsConv contains at least 3 sizes: 16x16 (tabs), 32x32 (bookmarks bar), and 48x48 (desktop icons). **Anti-Aliasing**: Our generator applies specific smoothing when moving from your high-definition logo to these micro-sizes so the icon remains legible even at 16 pixels. **Best Practice**: Always place your favicon.ico at the root of your server. Even without an HTML tag, browsers will look for it by default at this address to identify your site.