صانع ملصقات واتساب.

Add at least three stickers to a pack with a sticker app or WhatsApp’s “Create sticker”. Some browsers cannot save WebP; a PNG is offered then. Runs in your browser.

The picture is fitted inside 480 px, the outline is drawn from a distance map of the opaque pixels, and WebP quality is lowered step by step until the file is under 100 KB.

A transparent PNG with a 10 px white outline becomes a 512 × 512 WebP of about 40 KB.