Tools › Dissolve

Dissolve shapes into one — free

Turn lots of small areas into bigger ones: suburbs into regions, lots into properties, or everything into one outline. Drop your file here, choose what to group by, and download the merged shapes.

Your map file

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    Free · No signup · Nothing to install

    What it does

    Before Dissolve, before: A 200 m circle around every place: dozens of overlapping shapes.
    A 200 m circle around every place: dozens of overlapping shapes.
    After Dissolve, after: Dissolved: the circles melt into one clean outline.
    Dissolved: the circles melt into one clean outline.

    How to do it

    1. Any map file works: a zipped shapefile, KML or KMZ, GeoJSON, GeoPackage, GPX, a CSV with coordinates or a zipped .gdb.
    2. Drop your map file into the box above — or click “choose a file” to pick it from your device.
    3. Click “Set up Dissolve”. DropMaps opens in a new tab with your data on the map and the Dissolve tool open, your layer already picked.
    4. Leave “Dissolve by field” as None to merge everything into one shape, or pick a column to merge areas that share the same value. Then click Run.
    5. The result appears on the map as a new layer. Click “Save result…” to download it as a shapefile, KML, GeoJSON, GeoPackage or CSV.

    Questions

    Can I keep separate pieces apart?

    Yes. Set “Output parts” to Singlepart and each separate piece of a merged group becomes its own feature.

    Can I run it on only some features?

    Yes. Select the features on the map or in the table first, then tick “Selected features only” before clicking Run.

    How do I get the result?

    The result appears on the map as a new layer. Click “Save result…” under the Run button and choose a shapefile, KML, GeoJSON, GeoPackage or CSV.

    Which files can I use?

    Zipped shapefiles, KML and KMZ, GeoJSON, GeoPackage, GPX, CSV files with coordinates and zipped File Geodatabases.

    Is my data uploaded anywhere?

    No. The tool runs inside your browser, on your own computer. Nothing is sent to us unless you choose to save the map to a DropMaps account.

    Other free tools

    Viewers

    Shapefile viewerKML / KMZ viewerGeoJSON viewerCSV to mapGeoTIFF viewerGPX viewerGeoPackage viewerFile Geodatabase viewer

    Converters

    Shapefile to GeoJSONShapefile to KMLKML to shapefileKML to GeoJSONGeoJSON to shapefileGeoJSON to KMLCSV to KMLCSV to shapefileGPX to KMLKML to CSVGeoPackage to shapefileFile Geodatabase to shapefile

    Map functions

    BufferMerge layersClipEraseSimplifyCentroidsCount points in polygonsJoin by locationFix geometry

    See what else DropMaps can do

    It’s a full map maker in your browser — colour and label your data, draw and edit shapes, measure, stack files on top of each other, and share a map with a link anyone can open.

    Explore the features