EditPlus supports user-defined tools, help files and keystroke recording files.

You can customize tool items on User Tools page of the Preferences dialog box. There are 10 user tool groups and you can add up to 20 user-defined tools in each group. User-defined tools allows programs, help files and keystroke recording files. User tools will be shown at the bottom of Tools menu. Also you can access them through User Toolbar.

The output of tool execution can be captured in the Output Window, so that you can double-click the error line to automatically load the file and locate the cursor to that line.

You can also check 'Run as text filter' option. If this option is turned on, selected text or entire document will be passed to the tool through 'Standard Input'. Then the text will be replaced by the output passed from the tool through 'Standard Output'.

If you execute help file, EditPlus searches current word in the keyword list of the help file and shows the related topic.