Free · Join areas by a shared label

GeoJSON Polygon Dissolve Maker

Merge touching polygons that share the same group property and keep separate groups apart.

Clear map preview
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GeoJSON download

Work with map data

Use the example or add your own GeoJSON. Results stay in this browser tab.

Polygons with a group property

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "id": 1,
        "group": "west"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -79.54,
              43.61
            ],
            [
              -79.42,
              43.61
            ],
            [
              -79.42,
              43.7
            ],
            [
              -79.54,
              43.7
            ],
            [
              -79.54,
              43.61
            ]
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "id": 2,
        "group": "west"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -79.46,
              43.66
            ],
            [
              -79.34,
              43.66
            ],
            [
              -79.34,
              43.75
            ],
            [
              -79.46,
              43.75
            ],
            [
              -79.46,
              43.66
            ]
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "id": 3,
        "group": "east"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -79.34,
              43.62
            ],
            [
              -79.23,
              43.62
            ],
            [
              -79.23,
              43.7
            ],
            [
              -79.34,
              43.7
            ],
            [
              -79.34,
              43.62
            ]
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "id": 4,
        "group": "east"
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -79.29,
              43.67
            ],
            [
              -79.17,
              43.67
            ],
            [
              -79.17,
              43.76
            ],
            [
              -79.29,
              43.76
            ],
            [
              -79.29,
              43.67
            ]
          ]
        ]
      }
    }
  ]
}

Result view

Map previewGeoJSON

Making the map resultTurf is loading in this tab.

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EngineTurf.js

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FormatGeoJSON

Three simple steps

How to use it

Paste a polygon collection with a group property.
Check the joined result for each group value.
Check the map, then copy or download the GeoJSON result.

Your map data stays on this device

Turf.js reads and changes the GeoJSON inside this browser tab. Bookify does not upload or save it. Close the tab and the working copy is gone.