The 12d Model Web Viewer is a free, browser-based viewer for .12da and .12daz files — the data exchange formats used by 12d Model, the industry-leading civil engineering and land surveying software. View your 12d data instantly with no installation, no sign-up, and no data uploaded to any server.
2D & 3D Visualization
Explore survey data on interactive 2D maps powered by Leaflet with multiple basemaps including satellite imagery and OpenStreetMap. Switch to the 3D viewer built with Three.js to inspect terrain models, point clouds, TIN surfaces, and trimesh geometry from every angle. Toggle individual layers — points, lines, polygons, super alignments, TINs, meshes, and text — to focus on exactly the data you need.
Export to Industry-Standard Formats
Convert your 12da data to widely-used formats: KML and KMZ for Google Earth, GeoJSON for web mapping, DXF for AutoCAD and CAD software, and Shapefile (SHP) for ESRI ArcGIS and QGIS. All exports preserve coordinate transformations and layer structure.
Coordinate Reference Systems
Built-in support for Australian MGA2020 (Zones 44–56), New Zealand NZGD2000 coordinate systems, plus all projected EPSG codes for Australia and New Zealand. The viewer reprojects your data to WGS84 for accurate map overlay and geographic export.
What is a 12da File?
A .12da file is a text-based data exchange format from 12d Solutions for civil engineering and surveying data. It stores points with coordinates and attributes, polylines, polygons, triangulated irregular networks (TINs), super alignments, trimeshes, and text annotations. The .12daz format is a gzip-compressed variant for smaller file sizes.
How to Use the 12da Viewer
- Select your coordinate system (MGA2020, NZGD2000, or EPSG code) and zone.
- Tick Confirm CRS to enable file loading.
- Drag and drop a .12da or .12daz file — or click Load to browse.
- Use Fit to zoom to your data. Switch between 2D and 3D views.
- Toggle layers, adjust point size, and export to KML, GeoJSON, DXF, or Shapefile.
Privacy & Technology
All file parsing runs locally in your browser using WebAssembly (Rust-compiled WASM) for near-native performance. No data is ever sent to a server. The viewer works offline once loaded and can be installed as a Progressive Web App (PWA) on desktop and mobile.