Flatten Face (blender addon)

Flatten Face can flatten selected faces without affecting Non-Selected faces vertices (unlike Blender's "Make planar faces" tool).

Comparing to Blender's built-in tool "Make Planar Faces" under Mesh > Cleanup menu,
this addon does not affect the vertices that has "Non-selected geometry" connected to it.
As we see in the demo, the non-selected "cube" faces are still regular cube and not affected.

This tool works on any selected faces, just run the tool and it will flatten it and make them planar face.

Any vertices that are connected to Non-Selected geometry" will not be affected.

This tool works for any faces, including Quads, Triangles, Ngons, etc.

This is a free addon. Hope that it is useful for your quad modeling : )

X :

https://x.com/kushirosea