Layer Union
Combine multiple geospatial layers into one
How to use this tool?
- Upload several Shapefiles (select all the files: .shp, .shx, .dbf, .prj, .cpg), GeoJSON, KML, KMZ, or ZIP with complete shapefiles.
- Optional: choose whether you want to keep attributes and the output format.
Example of valid files:
manzanas.shp manzanas.shx manzanas.dbf manzanas.prj manzanas.cpg
manzanas.shp manzanas.shx manzanas.dbf manzanas.prj manzanas.cpg
Don't have a sample file?
Download sample shapefile
or
Countries GeoJSON.
Recommended: use GeoJSON for maximum web compatibility. For ArcGIS/QGIS, use Shapefile.
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Visual Example
Union of layers A and B: all features and attributes preserved.
Did you know we have Pro tools?
Free Tools
- Buffer
- Clip
- Union
- Basic formats
Pro Tools
- Boundary report writing
- Advanced analysis
- Multiple formats
- Priority Support
Frequently Asked Questions
The Union 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. For best results, we recommend using the same format for all input files, although the tool can handle mixed formats.
By default, all attributes from the original layers are kept in the resulting layer. If there are fields with the same name but different data types, the tool will try to make the best possible conversion or create unique fields to avoid conflicts.
No, all layers must have the same geometry type (points, lines, or polygons). If you need to combine different geometry types, consider using specialized tools or first converting the geometries to the same type.
The standard limit is 100MB per individual file. For larger files, consider splitting the data into smaller files or contacting support for enterprise options.
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