Start

• Drop a 16-bit grayscale PNG, or click the drop zone to choose one.
• Size must be tiles × 64 + 1 (example: 1025×1025 → 16×16 tiles).
• Cities are auto-gridded. Name the region, then Download ZIP into Documents/SimCity 4/Regions/.
• Unsaved work is drafted in this browser. Reload to continue.

Navigate

• Wheel zooms toward the pointer. + / − / Fit in the map toolbar.
• Space-drag or middle-drag pans.
• Z-click zooms in. Alt+Z-click zooms out.

Cities

• Small / Medium / Big place a city on click. Overlapping tiles are replaced.
• Erase city removes the city under the click from the config.
• Cities overlay shows borders on the map.
• Revert config restores the auto-grid without changing terrain.

Draw

• Paints height: Water (below the water line), Green, or a custom colour.
• Sample map (or Alt-click in Draw) picks a nearby colour from the terrain.
• Brush size and softness apply while you drag.

Stamp

• Alt-click the map to pick source terrain (dashed ring).
• Drag to clone that height and grain elsewhere.
• Alt-click again to pick a new source. Size and softness match Draw.

History

• Undo / Redo: Ctrl+Z and Ctrl+Shift+Z (⌘Z / ⌘⇧Z on Mac).
• Reset all clears the map, undo stack, and the saved draft after confirmation.

About

Browser port of SC4Mapper: 16-bit PNG import, auto city grid, terrain palette, QFS / DBPF save, and region ZIP. Unofficial fan tool, not affiliated with EA or Maxis.