Most ad servers don't support all modern file formats. This tool wraps your assets in .js files that are compatible with Swift ads, so they can be served and loaded reliably across all ad platforms. The file extension tells the processor what to do: .avif.png and .webp.png convert to those formats for smaller sizes, .crop.png auto-crops to visible bounds, and .split.png / .split.svg split into individual text lines for animation.