Paste a URL or your HTML, or upload an HTML file with its CSS files.
Pick a screen size and choose JPG or SVG.
Click Convert and download the full-page image.
Some design tools, slide templates and documents ask for SVG files. This page captures a web page or your own HTML and saves it as an SVG that holds the full-page capture as an embedded picture. It scales like an ordinary image rather than as vector shapes, so pick a wide screen size when you want more detail.