A favicon is one of the smallest assets on a site and also one of the most visible — it shows up in every open browser tab, every bookmark, and (for the larger sizes) every phone home screen icon if the site is added there. Shipping just one low-resolution PNG and calling it done is a common shortcut that shows up as a blurry icon on higher-density screens.
Different contexts need different sizes
Browser tabs typically use 16×16 or 32×32px icons, bookmarks and some OS contexts want 48×48px, and "add to home screen" on iOS and Android expects considerably larger sizes — 180×180px for Apple touch icons, 192×192px and 512×512px for Android and PWA manifests. Serving the wrong size to the wrong context is why some site icons look sharp in a browser tab but pixelated on a phone home screen.
Generating the whole set once beats resizing manually six times
Resizing a source image to each required dimension by hand in an image editor is tedious and easy to get inconsistent, especially if the source image isn't perfectly square to begin with.
TeckForge's Favicon Generator takes one source image and generates the full standard set — 16, 32, 48, 180, 192 and 512px — as a downloadable ZIP with the matching HTML tags included, all resized locally on a canvas in your browser.
