You can use any command line tool, like “HTML Tidy” (http://tidy.sourceforge.net/)
How-to
Download, unpack (I have a sub folder “Tools” in my EmEditor folder)
and add a EmEditor Tool:
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Tools > External Tools > Customize Tools > New
Title: HTML Tidy -xml
Command: .\Tools\HTMLTidy\tidy_(25mar2009)\tidy.exe
Arguments: -xml -i -q “$(Path)”
[X] Use Output Bar
Input: Document
Output: Replace Document
OK
OK
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For example see for more:
http://tidy.sourceforge.net/docs/tidy_man.html
http://xmlwriter.net/user_tools/tidy.shtml
(Currently I don’t know how to just replace the document without opening the output bar ???)
Open your file. run the new tool, close Output bar, done.
HTH? ;D