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Why .ico files are still the default favicon format in 2026
Universal browser support
All major browsers still read .ico files directly from the root of a site. Even browsers that favour PNG or SVG fall back to .ico when the link tag is missing, ensuring the site’s icon appears in tabs and bookmarks.
Multiple resolutions in a single file
.ico containers can hold 16×16, 32×32, 48×48 and larger PNG images, letting one file serve desktop, high‑DPI, and mobile displays without extra HTTP requests.
Cache friendliness and size
Because the .ico file is typically under 5 KB, it loads quickly and is cached aggressively by browsers, reducing bandwidth compared with separate PNG assets.
Legacy systems and CMS templates
Many content‑management systems and older server configurations automatically generate or expect an /favicon.ico file, so keeping the format avoids broken icons after updates.
Quick conversion with online tools
If you have a modern PNG or SVG logo, the Convert to ICO tool on our site turns it into a compliant .ico file in seconds, handling the required resolutions automatically.
Further reading: Wikipedia.
Try Convert to ICO →Frequently asked questions
Do modern browsers still need .ico for favicons?
Yes, they still check for /favicon.ico as a fallback even when a link tag specifies another format.
Can I use PNG or SVG instead of .ico?
You can, but you must include a proper tag and provide multiple sizes for older browsers.
Is there a file‑size limit for .ico favicons?
There’s no strict limit, but keeping the file under 5 KB ensures fast loading and good cache performance.
How do I create a .ico file from my logo?
Use our Convert to ICO tool; upload a PNG or SVG and it outputs a multi‑size .ico ready for deployment.
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