# Import / Export

TunnelCAD supports multiple file formats for exchanging project data with other software and for archiving tunnel monitoring records.

## Supported formats

Native format -- `.tun`
: TunnelCAD's own XML-based project format (IQML). Stores the complete project state including alignments, sections, templates, volumes, styles, and settings. See {doc}`file-format` for the schema reference.

LandXML 1.2 / 2.0
: Industry-standard XML format for civil engineering and survey data. TunnelCAD can both import and export LandXML files, with optional TunnelCAD-specific extensions encoded as `<Feature>` elements. See {doc}`landxml`.

ASCII measurements
: Per-section line points exchanged as comma- or whitespace-delimited text files (XYZ, station/offset/Z, or station/offset/dZ). Both directions are supported through the same column-mapping engine. See {doc}`measurements`.

Legacy TCM
: The file format used by earlier versions of TunnelCAD. A one-way conversion tool reads `.tcm` files and produces `.tun` projects. See {doc}`tcm-conversion`.

DXF templates
: Cross-section design profiles can be imported from DXF files. This workflow is covered in the {doc}`../templates/index` chapter.

## Export-only formats

Mass tables
: Volume and area computation results can be exported to CSV or XLSX spreadsheet files from the mass table dialog.

Analytics reports
: The analytics module exports clearance reports and deviation data to DXF drawings and XLSX spreadsheets.

```{toctree}
:maxdepth: 1
:caption: In this chapter

landxml
measurements
tcm-conversion
file-format
pdf-export
```