Use the visual editor or edit geometry code
EditPolygon supports two complementary workflows. Use the map to move vertices and reshape features, or inspect and edit geometry code when you need exact coordinate-level control.
- Open a GeoJSON file. Choose a
.geojsonor.jsonfile and review the detected features. - Edit the geometry. Select a feature, enter vertex editing, and move or add points. MultiPolygon parts and holes can be inspected separately.
- Inspect properties. Review feature names and attributes so geometry changes do not become detached from their metadata.
- Validate and export. Check for geometry errors, apply safe repairs where appropriate, then export all, selected or visible features.
GeoJSON details worth understanding
Coordinate order
GeoJSON positions use longitude first and latitude second for geographic coordinates.
Polygon holes
The first ring is the outer boundary. Additional rings represent holes within that polygon.
MultiPolygon
A MultiPolygon contains multiple independent polygons, each of which may contain holes.
When to use a desktop GIS instead
A browser editor is well suited to focused geometry changes, quick validation and format conversion. Use a desktop GIS for coordinate reference system transformations, complex spatial analysis, database workflows, cartographic production or very large datasets.
Frequently asked questions
Can I create GeoJSON from scratch?
Yes. Draw a polygon or add one from coordinate pairs, then export it as GeoJSON.
Can I repair invalid GeoJSON?
EditPolygon can identify and guide repairs for common polygon problems. Always review the fixed shape before operational use.
Does it support FeatureCollections?
Yes. Files containing multiple polygon features can be imported and managed as a project.
Ready to work on your file?
Open the editor, import your geometry and use the relevant operation from the toolbar or More menu.
Open the editor