A way to create/draw 2D game map.

I tried drawing one on photoshop, paint, etc…
But I just can’t find the right settings to draw the map the way I want to.

A perfect example is this one:

I just want to know some settings for GIMP or PAINT to be able to draw this kind of maps, (Maybe a website to draw pixels, rectangles with outline, etc. I just don’t know how to make them.)

The game is only interiors, so putting a camera in the sky will not work.

Thanks, in advance!

This thing has ALOT of options of online generations (thou made for AD&D) and is free and online.
https://donjon.bin.sh/adnd/dungeon/
Also it has maps. worldmaps, dungeon traps and alot of other stuff thou it`s completly random.

If you want to draw yourself - can try this - a very nice tool thou hard to get a hold of at first. And costs money to buy.
http://www.dundjinni.com/

And here`s a site that is totally dedicated to map drawing software.