Dissolve — Dissolve GIS Layers

Merges polygons by grouping them by an attribute field
How to use this tool?
  • Upload a Shapefile (ZIP or all files: .shp, .shx, .dbf, .prj, .cpg), GeoJSON, or KML with polygons.
  • Choose the field to group by (or leave it empty to dissolve everything into a single polygon).
  • Choose the aggregation function for numeric fields.
Recommended: use GeoJSON for maximum web compatibility. For ArcGIS/QGIS, use Shapefile ZIP.
Select Geographic File
Supported formats: Shapefile (.shp + .shx + .dbf), GeoJSON, KML, KMZ, GeoPackage (.gpkg), GML, GPX, GeoParquet (.parquet), FlatGeobuf (.fgb), TopoJSON, ZIP with Shapefiles
For shapefile: hold down Ctrl and select ALL the files with the same name.
Exact field name. Use "all" to merge all polygons.
By default the input file's CRS is kept.
This format always exports in WGS84 (EPSG:4326) per the format specification.
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What is Dissolve?

Dissolve merges adjacent geometries into a single one, grouping by an attribute field. Equivalent to the Dissolve function in ArcGIS and QGIS.

  • Merge municipalities by department
  • Merge parcels belonging to the same owner
  • Dissolve land-use layers

Visual Example

BEFORE A B C Dissolve AFTER Dissolved Field: tipo_uso Dissolve: merges geometries by common attribute

Dissolve merges adjacent polygons that share the same value in a field.

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Frequently Asked Questions

Dissolve merges geometries that share the same value in an attribute field, creating larger polygons that represent the union of the original geometries. It is fundamental for cartographic simplification and data analysis.

When "all" is used or the field is left empty, all the polygons in the layer are merged into a single polygon representing the layer's total extent.

The tool supports Shapefile (ZIP or individual files: .shp, .shx, .dbf, .prj, .cpg), GeoJSON, KML, KMZ, GPX, GML, GeoPackage (.gpkg), GeoParquet (.parquet), FlatGeobuf (.fgb), and TopoJSON.

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