I made an open source tool which adds a customizable grid to any terrain mod

Link and more explanation: https://github.com/e00E/Age-of-Empires-II-Grid-Generator

A few days ago I wanted to use a terrain mod from the steam workshop which did not come with a grid so I wrote a program to automatically add grid lines to workshop mods or the base game.

Additionally you can customize the look of the grid by choosing the color, line width and opacity. If there is demand other customization options could be added.

I hope it is useful for anyone in the same situation or mod authors who don't want to edit their textures by hand to add a grid.