WKT Validator — free & private

Paste WKT or GeoJSON to check ring closure, interior rings, and duplicate parts. Runs fully in your browser.

Open Full Editor WKT → GeoJSON

Input (WKT or GeoJSON)

PolygonNo errors1 warning

Runs locally in your browser. No uploads.

Issues

Need help?

1 outer ring(s) are clockwise; RFC 7946 recommends counter-clockwise.

Parts: 1

Holes: 0

Rings: 1

Vertices: 3

BBox: -80.3, 18.3, -64.8, 32.3

Area (approx km²): 1313752.977

Centroid: -70.2, 25.266667

Normalized (GeoJSON)

{
  "type": "Polygon",
  "coordinates": [
    [
      [
        -64.8,
        32.3
      ],
      [
        -65.5,
        18.3
      ],
      [
        -80.3,
        25.2
      ],
      [
        -64.8,
        32.3
      ]
    ]
  ]
}

Need auto-fixes (remove holes, dissolve, repair self-intersections) and export? Open the full editor.

FAQ

Does this upload my data?

No. Validation runs entirely in your browser for privacy and speed.

What issues are checked?

Open/closed rings, interior ring validity, duplicate parts, and simple self-intersection hints.

Which geometry types?

Polygon and MultiPolygon are supported. Other types can be normalized in the full editor.

Can I fix problems here?

Use the full editor to remove holes/duplicates, split, dissolve, buffer, and export.

Want to order satellite data for your polygons?

ClearSKY uses data fusion to deliver cloud-free imagery and robust time series at scale. Upload your polygons and place orders in minutes.

Open ClearSKY Dashboard