EditRocket provides an HTML Tidy tool provided by the W3C. Tidy is a tool that can take HTML source and automatically fix any errors and format the source.
The Tidy tool provides options such as Indent, Hide End Tags where appropriate, Upper Case Tags, and convert to Numeric Entities. The Tidy tool also allows users to output the format in html, xml, or xhtml. There is also an option to show any warnings that the Tidy tool produces.
To access the Tidy tool, use the Coding Tools - HTML - Tidy menu option