Notepad++ is the best simple VHDL editor for Windows. This video shows you how to download and install the editor, and how to install the VHDL plugin.
Blog post for this video: https://vhdlwhiz.com/free_vhdl_simula...
The Notepad++ source code editor is free open source software for the Microsoft Windows platform.
The latest version is available from:
https://notepad-plus-plus.org/download/
Notepad++ has VHDL support through a plugin which can be downloaded from the plugin manager from within Notepad++. The plugin offers syntax highlighting of the VHDL language, and the ability to copy the entity port and paste it as instantiation, signals or testbench stubs.
If you need a good editor, and not a full IDE, then Notepad++ with the VHDL plugin is a great choice.