ClearSKY FaviconClearSKY Polygon Tools
Free • Fast • Private by default

Polygon editor + converters for WKT, GeoJSON, Shapefile, KML & KMZ

Import, draw, fix, and export polygons without installing anything. Supports multiple formats and runs locally in your browser.

WKTGeoJSONShapefileCSVWKBKMLKMZ
Open editorBrowse convertersUniversal converter
Tip: bookmark /editor if you want the tool immediately.
Draw → clean → export
Runs locally
Built for polygons

The polygon editor

Everything you need to draw, clean, and export polygons.

Draw & manage geometries
Draw polygons, rename items, toggle visibility, and manage thousands of geometries.
Union / combine
Merge selected polygons into one (great for field boundaries and cleanup).
Subtract (draw or import)
Cut geometry from selected shapes — either by drawing the cut polygon or importing/pasting it.
Move mode (drag to reposition)
Toggle Move mode, click a polygon to select it, then drag to move the selection on the map.
Split & dissolve
Break multiparts apart, or dissolve selected shapes into clean single geometries.
Holes tools
Strip interior rings (holes) or extract them as new geometry when needed.
Transform tools
Buffer, simplify, and truncate coordinates for cleaner shapes and lighter files.
Quick export + Export dialog
Copy/download WKT + GeoJSON fast. Export Shapefile (.zip), KML, and KMZ (WGS84 lon/lat).
Undo/redo + safe editing lock
Separate global history and per-geometry edit sessions so you don’t accidentally destroy work.
Privacy-first by default
The core workflow runs in your browser. Nothing is uploaded unless you sign in to save or send geometries.
Validation & fixes
Catch common geometry issues and apply fixes (duplicates, self-intersections, ring closure, holes).

Converters

Open universal converter →
WKT → GeoJSON
Converter
Convert WKT to GeoJSON in your browser.
Open →
WKT → Shapefile
Converter
Convert WKT to Shapefile in your browser.
Open →
WKT → CSV
Converter
Convert WKT to CSV in your browser.
Open →
WKT → WKB
Converter
Convert WKT to WKB in your browser.
Open →
WKT → KMZ
Converter
Convert WKT to KMZ in your browser.
Open →
WKT → KML
Converter
Convert WKT to KML in your browser.
Open →
GeoJSON → WKT
Converter
Convert GeoJSON to WKT in your browser.
Open →
GeoJSON → Shapefile
Converter
Convert GeoJSON to Shapefile in your browser.
Open →
GeoJSON → CSV
Converter
Convert GeoJSON to CSV in your browser.
Open →
GeoJSON → WKB
Converter
Convert GeoJSON to WKB in your browser.
Open →
GeoJSON → KML
Converter
Convert GeoJSON to KML in your browser.
Open →
GeoJSON → KMZ
Converter
Convert GeoJSON to KMZ in your browser.
Open →
See all converters
Shapefile → WKT
Converter
Convert polygons quickly in the browser.
Open →
Shapefile → GeoJSON
Converter
Convert polygons quickly in the browser.
Open →
Shapefile → KML
Converter
Convert polygons quickly in the browser.
Open →
Shapefile → KMZ
Converter
Convert polygons quickly in the browser.
Open →
Shapefile → WKB
Converter
Convert polygons quickly in the browser.
Open →
Shapefile → CSV
Converter
Convert polygons quickly in the browser.
Open →
CSV → WKT
Converter
Convert polygons quickly in the browser.
Open →
CSV → GeoJSON
Converter
Convert polygons quickly in the browser.
Open →
CSV → Shapefile
Converter
Convert polygons quickly in the browser.
Open →
CSV → KML
Converter
Convert polygons quickly in the browser.
Open →
CSV → KMZ
Converter
Convert polygons quickly in the browser.
Open →
WKB → WKT
Converter
Convert polygons quickly in the browser.
Open →
WKB → GeoJSON
Converter
Convert polygons quickly in the browser.
Open →
WKB → Shapefile
Converter
Convert polygons quickly in the browser.
Open →
WKB → KML
Converter
Convert polygons quickly in the browser.
Open →
WKB → KMZ
Converter
Convert polygons quickly in the browser.
Open →
KMZ → Shapefile
Converter
Convert polygons quickly in the browser.
Open →
KMZ → GeoJSON
Converter
Convert polygons quickly in the browser.
Open →
KMZ → WKT
Converter
Convert polygons quickly in the browser.
Open →
KMZ → KML
Converter
Convert polygons quickly in the browser.
Open →
KMZ → CSV
Converter
Convert polygons quickly in the browser.
Open →
KML → KMZ
Converter
Convert polygons quickly in the browser.
Open →
KML → Shapefile
Converter
Convert polygons quickly in the browser.
Open →
KML → GeoJSON
Converter
Convert polygons quickly in the browser.
Open →
KML → WKT
Converter
Convert polygons quickly in the browser.
Open →
KML → CSV
Converter
Convert polygons quickly in the browser.
Open →

Utilities

WKT Validator
Utility
Validate WKT polygons and multipolygons. Checks rings, holes, duplicates, self intersections, and coordinate issues, with map preview and safe fixes. Runs locally. No uploads.
Open →
Shapefile Validator
Utility
Validate a zipped ESRI Shapefile in your browser. Checks Polygon and MultiPolygon rings, holes, duplicates, and self intersections, and can export fixed GeoJSON, WKT, or a repaired Shapefile ZIP. Runs locally. No uploads.
Open →
GeoJSON Validator
Utility
Validate GeoJSON polygons and multipolygons in your browser. Checks ring closure, holes, duplicates, self intersections, winding hints, and anti meridian warnings, with safe fixes and GeoJSON or WKT export. Runs locally in your browser, no uploads.
Open →
Shapefile Reducer
Utility
Reduce large Shapefiles in your browser. Simplify polygon geometry to shrink file size, clean coordinates, optionally filter to polygons only, and split exports into batches for easier downloads. Runs locally in your browser, no uploads.
Open →
CRS Converter
Utility
Reproject GeoJSON, WKT, and Shapefile ZIPs between coordinate reference systems. Detects source CRS from .prj when available, supports EPSG codes and UTM (auto or manual), previews in WGS84 (EPSG:4326), and exports GeoJSON, WKT, or a Shapefile ZIP. Runs locally in your browser, no uploads.
Open →
WKB Viewer
Utility
Inspect and decode WKB/EWKB (including SRID when present), convert to WKT or GeoJSON, and preview the geometry on a map. Runs locally in your browser, no uploads.
Open →

Learn & support

Glossary
Site
Glossary of WKT, GeoJSON, polygons, CRS/EPSG, SRID, WKB/EWKB, PostGIS and topology terms — with examples and links to converters and validators.
Open →
Guides
Site
Evergreen guides for WKT, GeoJSON, Shapefile, CRS/EPSG, validation, and common polygon failures.
Open →
FAQ
Site
FAQ for ClearSKY Polygon Tools: WKT/GeoJSON/Shapefile conversions, polygon validity, CRS/EPSG, exports, privacy (no uploads), and common errors.
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About
Site
About ClearSKY Polygon Tools: An in-browser polygon editor, converters and validators for WKT, GeoJSON, Shapefile, WKB, KML and KMZ. Private by default (no uploads).
Open →