Notice: Although webdot can still be configured as a public server, we no longer provide such a server ourselves and we don't recommend that others do so either. Webdot contains no mechanisms for limiting the load on a public server. Instead we recommend that you set up a server just for your own graphs.
If a public WebDot server is available then graphs can be served without installing WebDot locally. For example, if there is a graph at: http://www.graphviz.org/demo.dot
then this img tag in an html web page:
<img src="http://webdot.graphviz.org/cgi-bin/webdot/http://www.graphviz.org/demo.dot.dot.png" alt="graph from public webdot server">
will produce the graph layout at the top of this page.