A browser-based geospatial file converter powered by GDAL/OGR and WebAssembly

Transform geospatial vector data between various formats directly in your browser - no server uploads required. All processing happens locally using WebAssembly for maximum privacy and performance.

• 30 Supported Formats: GeoJSON, TopoJSON (input only), Shapefile, GeoPackage, KML, GPX, GML, FlatGeobuf, CSV, DXF, PMTiles, MBTiles, DGN, GeoJSONSeq, GeoRSS, Geoconcept, JML, JSON-FG, MapML, ODS, OGR GMT, PCIDSK, PDS4, S-57, SQLite, Selafin, VDV, VICAR, WAsP, XLSX, PGDump (output only)
• CRS Transformation: Reproject coordinates between different coordinate reference systems (EPSG codes and custom PROJ strings)
• Advanced Processing Options:
  • Geometry filtering by type (Point, LineString, Polygon, etc.)
  • Attribute filtering with SQL-like WHERE clauses
  • Field selection for optimized output
  • Geometry simplification (Douglas-Peucker algorithm)
  • Invalid geometry repair
  • Multi-geometry handling and explosion
  • 2D/3D coordinate dimension control
• Format-Specific Optimizations:
  • Shapefile: Automatic geometry type splitting with multi-promotion
  • GeoJSON: Configurable coordinate precision and bbox generation
  • GeoPackage: Spatial indexing
  • CSV: Flexible geometry output (WKT or X/Y columns)
• Privacy-First: All processing happens in your browser using WebAssembly
• Modern UI: Clean, dark-themed interface built with React and Tailwind CSS

• GDAL/OGR: Industry-standard geospatial library (via @cpp.js/package-gdal)
• WebAssembly: Compiled C++ GDAL running natively in the browser
• React 19: Modern React with hooks
• Vite: Fast build tooling and dev server
• Tailwind CSS v4: Utility-first styling
• Motion: Smooth animations
• Headless UI: Accessible UI components

• Node.js 18+ and pnpm
• Basic understanding of geospatial formats is helpful but not required

Install the dependencies:

pnpm install

Start the dev server:

pnpm run dev

The app will be available at http://localhost:5173

Build the app for production:

pnpm run build

Preview the production build:

pnpm run preview

Run end-to-end tests:

# Development mode (with dev server)
pnpm run e2e:dev

# Production mode (with production build)
pnpm run e2e:prod

Note: Playwright browsers need to be installed first:

pnpm exec playwright install

1. Upload a file: Drag and drop or click to select a geospatial file
2. Select formats: Input format is auto-detected, choose your desired output format
3. Configure options (optional): Expand "Advanced Options" to:
   • Transform coordinate systems
   • Filter features by geometry type or attributes
   • Simplify geometries
   • Customize format-specific settings
4. Convert: Click "Convert & Download" to process and download your file

geoconverter/
├── src/
│   ├── App.jsx              # Main application component
│   ├── main.jsx             # Application entry point
│   ├── components/          # Reusable UI components
│   └── native/              # C++/GDAL bindings (auto-generated)
├── e2e/                     # End-to-end tests
│   ├── conversion.spec.cjs  # Conversion test suite
│   └── fixtures/            # Test data files
├── public/                  # Static assets
└── index.html               # HTML entry point

MIT

Built with Cpp.js - enabling C++ libraries in JavaScript via WebAssembly. Powered by GDAL/OGR - the industry-standard geospatial data abstraction library.