ClearSKY FaviconClearSKY Polygon Tools
Free • Fast • Private by default

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

Import, draw, fix, and export polygons without installing anything. Includes attributes and revocable share links, while running locally by default.

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

Editor tools for polygon cleanup

Draw, select, reshape, validate, and export polygons directly in the browser.

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.
Split & dissolve
Break multiparts apart, or dissolve selected shapes into clean single geometries.
Transform tools
Buffer, simplify, and truncate coordinates for cleaner shapes and lighter files.
Attributes view & editing
Switch to the attributes table, add fields, and edit per-geometry values directly in the sidebar.
Quick export + Export dialog
Copy/download fast, then export WKT, GeoJSON, KML/KMZ, Shapefile, WKB/EWKB, and GeoPackage.
Revocable share links
Signed-in users can generate time-limited links that recipients can open without an account.
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 choose Save, Share, or Send.
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 →
WKT → GeoPackage
Converter
Convert WKT to GeoPackage 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 →
See all converters
GeoJSON → KMZ
Converter
Convert GeoJSON to KMZ in your browser.
Open →
GeoJSON → GeoPackage
Converter
Convert GeoJSON to GeoPackage in your browser.
Open →
Shapefile → WKT
Converter
Convert Shapefile to WKT in your browser.
Open →
Shapefile → GeoJSON
Converter
Convert Shapefile to GeoJSON in your browser.
Open →
Shapefile → GeoPackage
Converter
Convert Shapefile to GeoPackage in your browser.
Open →
Shapefile → KML
Converter
Convert Shapefile to KML in your browser.
Open →
Shapefile → KMZ
Converter
Convert Shapefile to KMZ in your browser.
Open →
Shapefile → WKB
Converter
Convert Shapefile to WKB in your browser.
Open →
Shapefile → CSV
Converter
Convert Shapefile to CSV in your browser.
Open →
CSV → WKT
Converter
Convert CSV to WKT in your browser.
Open →
CSV → GeoJSON
Converter
Convert CSV to GeoJSON in your browser.
Open →
CSV → Shapefile
Converter
Convert CSV to Shapefile in your browser.
Open →
CSV → KML
Converter
Convert CSV to KML in your browser.
Open →
CSV → KMZ
Converter
Convert CSV to KMZ in your browser.
Open →
CSV → GeoPackage
Converter
Convert CSV to GeoPackage in your browser.
Open →
WKB → WKT
Converter
Convert WKB to WKT in your browser.
Open →
WKB → GeoJSON
Converter
Convert WKB to GeoJSON in your browser.
Open →
WKB → Shapefile
Converter
Convert WKB to Shapefile in your browser.
Open →
WKB → KML
Converter
Convert WKB to KML in your browser.
Open →
WKB → KMZ
Converter
Convert WKB to KMZ in your browser.
Open →
WKB → CSV
Converter
Convert WKB to CSV in your browser.
Open →
KMZ → Shapefile
Converter
Convert KMZ to Shapefile in your browser.
Open →
KMZ → GeoJSON
Converter
Convert KMZ to GeoJSON in your browser.
Open →
KMZ → WKT
Converter
Convert KMZ to WKT in your browser.
Open →
KMZ → KML
Converter
Convert KMZ to KML in your browser.
Open →
KMZ → CSV
Converter
Convert KMZ to CSV in your browser.
Open →
KMZ → GeoPackage
Converter
Convert KMZ to GeoPackage in your browser.
Open →
KML → KMZ
Converter
Convert KML to KMZ in your browser.
Open →
KML → Shapefile
Converter
Convert KML to Shapefile in your browser.
Open →
KML → GeoJSON
Converter
Convert KML to GeoJSON in your browser.
Open →
KML → WKT
Converter
Convert KML to WKT in your browser.
Open →
KML → CSV
Converter
Convert KML to CSV in your browser.
Open →
KML → GeoPackage
Converter
Convert KML to GeoPackage in your browser.
Open →
GeoPackage → GeoJSON
Converter
Convert GeoPackage to GeoJSON in your browser.
Open →
GeoPackage → Shapefile
Converter
Convert GeoPackage to Shapefile in your browser.
Open →
GeoPackage → KML
Converter
Convert GeoPackage to KML in your browser.
Open →
GeoPackage → KMZ
Converter
Convert GeoPackage to KMZ in your browser.
Open →
GeoPackage → WKT
Converter
Convert GeoPackage to WKT in your browser.
Open →
GeoPackage → CSV
Converter
Convert GeoPackage to CSV in your browser.
Open →
Workflow

From rough geometry to clean export

A practical browser workflow for checking, cleaning, and converting polygon data before you use it somewhere else.

Try the workflow
01
Import or paste
Start with WKT, GeoJSON, Shapefile, KML, KMZ, GeoPackage, or draw directly on the map.
02
Inspect and select
Check area, vertices, holes, parts, labels, attributes, visibility, and select only the geometries you need.
03
Clean and reshape
Move, split, dissolve, subtract, buffer, simplify, truncate, remove holes, fix topology, and handle CRS on import.
04
Export or continue
Copy, download, save, share, or send clean polygons as WKT, GeoJSON, KML/KMZ, Shapefile, WKB/EWKB, or GeoPackage.
Validation before import
Local editing by default
Multi-format export

Utilities

WKT Validator
Utility
Validate WKT polygons and multipolygons.
Open →
Shapefile Validator
Utility
Validate a zipped ESRI Shapefile in your browser.
Open →
GeoJSON Validator
Utility
Validate GeoJSON polygons and multipolygons in your browser.
Open →
Shapefile Reducer
Utility
Reduce large Shapefiles in your browser.
Open →
CRS Converter
Utility
Reproject GeoJSON, WKT, and Shapefile ZIPs between coordinate reference systems.
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.
Open →

Learn & support

Glossary
Site
Glossary of WKT, GeoJSON, polygons, CRS/EPSG, SRID, WKB/EWKB, PostGIS and topology terms — with examples and links to co…
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 uplo…
Open →
About
Site
About ClearSKY Polygon Tools: An in-browser polygon editor, converters and validators for WKT, GeoJSON, Shapefile, WKB,…
Open →