The following umpleOnline iframe URL uses ?example=2DShapes&readOnly¬ext&nomenu&nochrome
Height should to be specified, or else scrolling should be used. You can also show just text, a menu and various other combinations of UmpleOnline features. You can allow editing as part of a live document (although it is recommended setting up your own UmpleOnline server if you do that in your organization). Below is the same example with only the text shown.
Finally, here is an example of the same diagram scaled down to a smaller size.