Check every common favicon path, size, and format at once — before browsers, bookmarks, and home screens show a blank page instead
A missing favicon is a small thing that makes a site look unfinished — a blank tab icon, a generic gray square on an iPhone home screen, or a broken icon in a browser's bookmark bar. Browsers and operating systems check several different places for an icon, not just one file, so it's easy to have a favicon that works in one context and quietly fails in another. This tool checks the icons your page actually declares in its <head>, the handful of default paths browsers fall back to automatically (like /favicon.ico and /apple-touch-icon.png), and your web app manifest if you have one — then decodes each file it finds to confirm its real format and size, including reading the embedded size list straight out of multi-resolution .ico files. Run it after a redesign or a CMS migration to make sure nothing got left behind.