WhatsApp requires custom stickers to meet exact technical formatting rules: a square canvas of exactly 512 by 512 pixels, an exported WebP file format, and transparent margins so graphic edges do not bleed into chat bubble borders. This tool formats any uploaded picture or transparent PNG into that required frame directly in your browser.

When you load an image, the tool calculates proportional scaling to preserve aspect ratio, centers the graphic within the 512x512 boundary, and applies your chosen margin padding. You can then download the resulting WebP sticker file immediately.

### A Real Example You have a transparent cutout logo measuring 1200x800 pixels saved as "mascot.png". You upload the image to the sticker workspace. The tool scales the graphic proportionally to fit within 480x480 pixels (using default 16px safety padding), centers it on the transparent 512x512 canvas, and renders the result. You click "Download WebP Sticker" to save "mascot-sticker.webp" for adding into your sticker pack application.

### How Your Data Is Processed All canvas manipulation and format encoding take place locally inside your web browser using HTML5 Canvas rendering. Your uploaded images and generated sticker files remain entirely in your device memory and are never transmitted to remote web servers.