Having tried GIMP,some other local tools and all the major VTT tools I still wanted something simpler as I only needed fog of war, not the other bells and whistles. So created this Fog of War tool that does not have any whistles outside a simple way of handling just that.
Added a local map veil for RPG sessions. Load any map, cover it in fog, axnd reveal areas as players explore. Image processing is entirely local for maximum privacy.

What changed
- New Feature: Fog of War. A local map veil for RPG sessions. Load a map, cover it in fog, and reveal areas as the party explores. Works entirely in your browser—no images are ever uploaded to our server.
- Local Map Painting. Reveal areas of your map by painting with a customizable brush.
- Undo/Redo Support. Full support for reversing or restoring brush strokes.
- PNG Export. Save the current revealed state of your map as a new PNG file.
- UI & Layout. Integrated with the global layout; includes a “Fit to screen” feature for better map visibility.
- Help & Documentation. Added comprehensive help and privacy details for the new tool.
- Enhanced Tracking. Added visit counting for the Fog of War page in the global stats.
- Improved Labels. Refined the stats page to show friendly labels for all application tools.
Impact: Better support for tactical map exploration with complete privacy and improved visibility into tool usage.
You can find it here https://www.toolsfrompavis.com
You will find other tools and charts in Mythras Charts and Tables