Minify XHTML Online
XHTML is a more XML-based version of HTML, which is more strict and has more validation rules. If an HTML page has an error, the browsers still show them. In the case of XHTML files, the document must follow the rules. Anyway, the XHTML documents, like XML and HTML files, have many unnecessary empty spaces. This can be removed to reduce the bandwidth that is used.
For the XHTML minification, I have used the Web Markup Minifier.