Free Online WKT to KML Converter: Complete Guide to Converting Geographic Data Formats
Converting between Well-Known Text (WKT) and Keyhole Markup Language (KML) formats has never been easier. Our free online WKT/KML converter tool instantly transforms your geographic data between these essential GIS formats, complete with live map visualization and satellite imagery support. Whether you’re a GIS professional, developer, researcher, or student working with spatial data, this comprehensive converter handles point, line, and polygon geometries with precision and ease.
What Are WKT and KML Formats?
Well-Known Text (WKT) is a markup language standard used to represent vector geometry objects on geographic maps. Developed by the Open Geospatial Consortium (OGC), WKT provides a compact, human-readable way to describe spatial data, including points, lines, polygons, and complex multi-geometries.
Keyhole Markup Language (KML) is an XML-based file format used to display geographic data in Earth browsers like Google Earth and Google Maps. Originally developed by Keyhole Inc. (later acquired by Google), KML has become the standard for sharing geographic visualizations and is widely supported across mapping platforms.
🗺️ WKT/KML Converter
Convert between Well-Known Text and Keyhole Markup Language formats with live map preview
📋 How to Use:
- Choose your input format (WKT or KML) – output automatically switches to the opposite format
- Enter your data by typing, pasting, or uploading a file
- Upload files auto-convert! Just drop a file and it converts automatically
- Click “Convert” for manual entries, or just upload and watch the magic!
- Download & view – get your converted file and see it on the satellite/street map
Drop a file here or click to browse
Supports .kml and .wkt files
How to Use the WKT/KML Converter Tool
Quick Start Guide
Our intelligent converter automatically detects your input format and converts to the opposite format:
- Choose Your Input Format: Select either WKT or KML format from the input panel
- Enter Your Data: Type, paste, or upload your geographic data
- Automatic Conversion: Watch as the tool instantly converts your data to the opposite format
- View on Map: See your converted data displayed on an interactive map with satellite imagery
- Download Results: Save your converted file in the desired format
Input Methods
Manual Entry: Simply type or paste your WKT/KML data into the input field. The converter automatically processes your data as you type, with intelligent debouncing to ensure smooth performance.
File Upload: Drag and drop or click to upload .wkt or .kml files. The tool automatically detects the format and converts to the opposite type instantly.
Example Data: Click the example links to load sample data and see the converter in action with real geographic coordinates.
Advanced Features
Live Map Visualization: All converted data automatically appears on an interactive Leaflet map with both street and satellite view options. Use the layer control to switch between OpenStreetMap and high-resolution satellite imagery.
Smart Format Detection: The tool intelligently recognizes WKT and KML formats, automatically switching the input/output formats for seamless conversion.
Real-time Processing: No convert button needed! The tool processes your data automatically as you type, paste, or upload files.
Download Options: Export your converted data as properly formatted .wkt or .kml files ready for use in GIS applications, Google Earth, or mapping software.
Supported Geometry Types
WKT Geometries
- POINT: Single coordinate locations
POINT(-74.0060 40.7128) - LINESTRING: Connected line segments
LINESTRING(-74 40.7, -87 41.8, -118 34.0) - POLYGON: Closed shapes with optional holes
POLYGON((-74.1 40.6, -74.0 40.6, -74.0 40.8, -74.1 40.8, -74.1 40.6)) - MULTIPOINT: Multiple point locations
- MULTILINESTRING: Multiple line features
- MULTIPOLYGON: Multiple polygon areas
KML Elements
- Point Placemarks: Single location markers with names and descriptions
- LineString Placemarks: Path and route representations
- Polygon Placemarks: Area boundaries with outer and inner rings
- Document Structure: Organized KML with metadata and styling
Frequently Asked Questions (FAQ)
General Questions
Q: Is this WKT to KML converter free to use? A: Yes, our WKT/KML converter is completely free with no registration required. You can convert unlimited files and data without any restrictions.
Q: What file formats does the converter support? A: The tool supports Well-Known Text (.wkt) and Keyhole Markup Language (.kml) files. It automatically detects the input format and converts it to the opposite format.
Q: Can I convert KML to WKT format? A: Absolutely! The converter works bidirectionally. Upload a KML file or paste KML content, and it will automatically convert to WKT format.
Q: Is there a file size limit for uploads? A: The converter can handle typical GIS files. For very large datasets, consider breaking them into smaller chunks for optimal performance.
Technical Questions
Q: What coordinate systems does the converter support? A: The converter primarily works with geographic coordinates (longitude/latitude). For projected coordinate systems, ensure your data is in the correct format before conversion.
Q: How accurate is the WKT to KML conversion? A: The conversion maintains full geometric precision. All coordinate values, geometry types, and spatial relationships are preserved during the conversion process.
Q: Can I convert complex geometries with holes? A: Yes, the converter supports complex polygons with interior rings (holes) in both WKT and KML formats.
Q: Does the tool work offline? A: The converter requires an internet connection for the map tiles and to load the web application. However, once loaded, the conversion processing happens locally in your browser.
Usage Questions
Q: Why don’t I see a convert button? A: Our smart converter automatically processes your data as you type or upload files. The convert button only appears when manual conversion is needed (typically for error recovery).
Q: How do I view my converted data on a map? A: All converted data automatically appears on the interactive map below the conversion panels. Use the layer control in the top-right corner to switch between street and satellite views.
Q: Can I copy the converted data to my clipboard? A: Yes, use the “Copy” button in the output panel to copy the converted text to your clipboard for pasting into other applications.
Q: What formats can I download? A: You can download your converted data as .wkt (text) or .kml (XML) files, depending on your conversion direction.
Troubleshooting
Q: My WKT data isn’t converting properly. What should I check? A: Ensure your WKT syntax is correct. Common issues include missing parentheses, incorrect coordinate order (longitude should come before latitude), or malformed geometry declarations.
Q: The KML upload shows an error. What’s wrong? A: Verify that your KML file contains valid XML syntax and includes properly structured Placemark elements with coordinate data.
Q: Why isn’t my data showing on the map? A: Check that your coordinates are in the correct range (longitude: -180 to 180, latitude: -90 to 90) and that your geometry is properly formed.
Q: The conversion seems slow. How can I improve performance? A: For large datasets, try breaking them into smaller files. The converter includes intelligent debouncing, so it may wait for you to finish typing before processing.
Data Privacy and Security
Q: Is my geographic data secure when using this converter? A: Yes, all conversions happen locally in your browser. Your data is not uploaded to external servers or stored anywhere. The tool respects your privacy completely.
Q: Can I use this tool for commercial projects? A: Yes, the converter is free for both personal and commercial use. There are no licensing restrictions on the converted output files.
Best Practices for WKT/KML Conversion
Data Preparation
- Verify coordinate accuracy before conversion
- Ensure proper geometry closure for polygons
- Include meaningful names and descriptions in KML placemarks
- Use consistent coordinate ordering (longitude, latitude)
Quality Assurance
- Always preview converted data on the map before downloading
- Test converted files in your target application (Google Earth, GIS software)
- Validate complex geometries with multiple parts or holes
- Check coordinate reference system compatibility
Performance Optimization
- Break large datasets into manageable chunks
- Remove unnecessary precision from coordinates if file size is a concern
- Use simplified geometries for web applications when appropriate
