Your own image or an emoji → PNG icons in the sizes you need, plus the HTML code
Image
Emoji
Drop an image here or click to choose one
The image will be center-cropped to a square
16×16
32×32
48×48
180×180 (apple-touch-icon)
Upload an image or type an emoji…
Everything runs in your browser — the image never leaves your device. Files are generated as PNG (modern browsers support PNG favicons directly); download the sizes you need and drop them next to your site's index.html.