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Turn any image into the full set of favicon sizes plus the HTML snippet.
A favicon is not one file any more. Browsers want several PNG sizes, iOS wants an apple-touch-icon at 180px, Android reads icons from a web app manifest, and the traditional ICO still gets requested from the site root by things that never learned about the others.
The design constraint is 16 pixels. Anything that works there is a shape or one or two letters, never a scaled-down logo — detail that survives at 512 turns to mush at tab size. Designing the small one first and scaling up produces a better set than the reverse.