1. Use Notepad to open the two text files you want to compare. 
 
 
 
 
 2. Click menu Plugins > Compare > Compare 
 
 
 
 
 3. So far, you can see that two files highlight the difference in two columns, respectively. 
 
 
 
 
 
 
 
 
 
 
 Note: The compare plug-in is mentioned here, the installation method is as follows: 
 
 
 
 
 1. According to the article, how to get compare plugin back into notepad++., in the address "https://sourceforge.net/project/showfiles.php?group_id= 189927 "Download the plug-in, get the compressed package after extracting a DLL file, put the DLL file into the Notepad plug-in folder plugin, such as C:\Program files\notepad++\plugins. 
 
 
 
 
 2.: The Plugin Manager module was introduced after the Notepad5.6 version, where compare can be downloaded and installed directly. 
 
 
 
 
 tap menu Plugins menu > Plugin Manager, enable Compare options Click Install. 
 
 
 
 
 How to compare two files in a notepad++