Just copy the html, js or css code which you want to format. And paste it to the first textarea below, then click the Format button, the beautified source code string will appear in the seconde textarea below.
Unpack all css and css3 styles: padding, margin, font, background, text, color, width, height, border, display, transition, position and so on.
Decode all html and html5 elements selector: div, p, a, h1, table, ul, ol, li, input, form, span, iframe and so on.
Formatted html, js and css are all valid, and can be compatible with all the dominant browser. You can run the free online html/js/css beautifier on your Windowns computer, Mac and Linux.