Notepad Diff. Once the plugin is installed you will be prompted to restart notepad. After that a small window will appear here select plugin admin.
This is a very useful diff plugin to show a difference between 2 files side by side diff against git svn and last save. Click on the plugins menu then compare and compare again. After that a small window will appear here select plugin admin.
Goto plugins compare compare.
Open up the two files that you want to compare in notepad. Offline mode advanced features and more. For doing that click on plugins on the above given menu titles. Both files will show up side by side and you will see the differences highlighted.