In Notepad ++, go to Plugins > Plugin manager > Show Plugin Manager , then find the Xml Tools plugin. Check the box and click Install

Open the XML document you want to validate and press Ctrl + Shift + Alt + M (or use the Menu if you prefer Plugins > XML Tools > Validate Now ).
The following dialog box opens: 
Click on ... Point to the XSD file, and I'm sure you can handle it.
Hope this saves you some time.
EDIT: The plugin manager was not included in some versions of Notepad ++ because many users did not like the commercials it had previously shown. If you want to keep the older version, but still want to have a plugin manager, you can download it on github and install it by unpacking the archive and copying the contents to the plugins and updates folder.
In version 7.7.1 , the plugin manager returned under a different look ... Plugin Admin , so now you can just update Notepad ++ and get it back.

Matas Vaitkevicius May 11 '15 at 12:19 2015-05-11 12:19
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