ICO vs PNG vs SVG
Try it now: Open IcoSmith, drop your image, pick 16, 32, 48, 64, 128, 256, and export the ICO or the full favicon package.
ICO supports multiple bitmap sizes in a single file and remains the most compatible favicon format, especially for Windows/legacy. PNG is ideal for Apple Touch icons and general images. SVG is perfect for mask icons (Safari pinned tab) and scalable UI, but some platforms still expect ICO.
Recommendation
Ship a multi‑size ICO (16–256), a 180×180 PNG, a mask icon SVG, and reference them via the favicon package.
Ready? Generate your favicon now.