Supported File Formats


The COMSOL Model file type, with the extension .mph, is the default file type containing the entire model tree and application tree from the Model Builder and Application Builder, respectively. The file contains both binary and text data. The mesh and solution data is stored as binary data, while all other information is stored as plain text.

The COMSOL binary and text file types, with the extension .mphbin and .mphtxt, respectively, contain either geometry objects or mesh objects that can be imported directly to the Geometry or Mesh nodes in the model tree.

The Physics Builder file type, with the extension .mphphb, contains one or more user-defined physics interfaces that you can access from the Model Builder.

Formato file Estensione Lettura Scrittura
Modello COMSOL .mph
Dati in formato binario .mphbin
Dati in formato testo .mphtxt
Physics Builder .mphphb


The CAD Import Module and Design Module allow for import of a range of industry-standard CAD file types. Additional file types are available through the bidirectional functionality of the LiveLink products for CAD as well as with the File Import for CATIA® V5 add-on.

The DXF (2D), VRML (3D), and STL (3D) file types are available for import with COMSOL Multiphysics and do not require any add-on products. Unless noted otherwise in the table below, import of the listed file types is available on all supported versions of Linux®, Mac OS X, and Windows® operating systems.

Formato file Estensione Import Export
AutoCAD®1,2,3 .dwg Yes9
Inventor®1,2,3 .ipt,.iam Yes9
NX®1,4 .prt No
PTC® Creo® Parametric1,3 .prt,.asm Yes9
PTC® Pro/ENGINEER®1,3 .prt,.asm Yes9
Revit® Architecture3,5 .rvt Yes9 Yes9
Solid Edge®3,6 .par,.asm Yes9 Yes9
SOLIDWORKS®1,2,3 .sldprt,.sldasm Yes9
DXF (3D1,2 and 2D) .dxf Yes10
Parasolid®1 .x_t,.xmt_txt,.x_b,.xmt_bin
ACIS®1 .sat,.sab,.asat,.asab
STEP1 .step,.stp No
IGES1 .iges,.igs No
CATIA® V52,7 .CATPart,.CATProduct No
VRML, v18 .vrml,.wrl No
STL .stl

1Requires one of the LiveLink™ products for AutoCAD®, Revit®, PTC® Creo® Parametric™, Inventor®, PTC® Pro/ENGINEER®, Solid Edge®,SOLIDWORKS®, CAD Import Module, or Design Module
2Importazione supportata solo su sistemi operativi Windows.
3Synchronization of files between COMSOL Multiphysics® and a linked CAD program supported on Windows® 7, 8.1 and 10 operating systems only
4Import supported on Windows® and Linux operating systems only
5Requires LiveLink™ for Revit®
6Requires LiveLink™ for Solid Edge®
7Richiede il CAD Import Module (o uno dei prodotti LiveLink per AutoCAD®, PTC® Creo® Parametric™, Inventor®, PTC® Pro/ENGINEER®, SOLIDWORKS®, o SpaceClaim®) e il File Import for CATIA® V5
8Funzionalità limitata ad un singolo dominio geometrico
9File per/da pacchetto CAD corrispondente
10Writing to file is supported for 2D geometry only


The ECAD Import Module allows for import of 2D layout files with automatic conversion to 3D CAD models. The Touchstone file type is used for exporting S-parameters, impedance, and admittance values from simultaneous port and frequency sweeps. The SPICE Circuit Netlist file type is converted at import to a series of lumped circuit element nodes under an Electrical Circuit node, in the model tree.

Formato file Estensione Lettura Scrittura
IPC-25811 .cvg, .xml No
NETEX-G1 .asc No
ODB++1 .zip,.tar,.tgz,.tar.gz No
ODB++(X)1 .xml No
GDS1 .gds No
Touchstone2 .s2p, .s3p, .s4p, ... No
SPICE Circuit Netlist3 .cir No

1Requires the ECAD Import Module
2Requires one of the AC/DC Module, RF Module, MEMS Module, or Wave Optics Module
3Requires one of the AC/DC Module, RF Module, MEMS Module, Plasma Module, or Semiconductor Module

Material Databases

The Chemical Reaction Engineering Module and the Plasma Module can read CHEMKIN® files to simulate complex chemical reactions in the gas phase. The Plasma Module can read LXCAT files for sets of electron impact collision cross sections.

Formato file Estensione Lettura Scrittura
CHEMKIN®1 .dat, .txt, .inp3 No
CAPE-OPEN (direct connection)1 n/a N/A N/A
LXCAT file2 .lxcat,.txt No

1 Any file format is allowed, these are the most common extensions
2Requires the Plasma Module
3Any extension is allowed; These are the most common extensions


The NASTRAN® Bulk Data file types are used to import a volumetric mesh. The VRML and STL file types are used to import a triangular surface mesh and cannot be used for creating a volumetric mesh. If imported as a geometry, VRML and STL files can be used as a basis for creating a volumetric mesh for a single geometric domain

Formato file Estensione Lettura Scrittura
NASTRAN® Bulk Data .nas, .bdf, .nastran, .dat
STL .stl
VRML, v1 .vrml, .wrl No
VTK .vtu No

Dati numerici, immagini e animazioni

Results visualization can be exported to a number of common image file types; See the table below. Images can also be read and used as interpolation functions for physics modeling. Animations can be exported to one of the Animated GIF, Adobe® Flash®, and AVI file types.

Formato file Estensione Lettura Scrittura
Adobe® Flash® .swf No
Animated GIF .gif No
AVI1 .avi No
BMP .bmp
EPS (1D graphs) .eps No
GIF .gif
JPEG .jpg, .jpeg
MP42 .mp4 No
OGV2 .ogv No
PNG .png
TIFF .tif, .tiff No
WEBM2 .webm No

1Disponibile solo per Windows

2Available in the Application Builder, for Windows® only, in the video form object

Linguaggi di programmazione

Model files for Java® are editable files with the extension .java that contain sequences of COMSOL commands as Java® code. Edit the files in a text editor to add additional commands. You can compile these Java® files into Java® Class files with the extension .class and run them as separate applications. Program code used in model files for Java® is essentially identical to that of the Method editor in the Application Builder. However, the Method editor comes with an integrated Java® compiler.

Model files for MATLAB® are editable script files (M files), similar to the model files for Java®, for use with MATLAB®. These model files, which have the extension .m, contain a sequence of COMSOL commands as a MATLAB® M file. You can run the model files in MATLAB® like any other M file scripts. It is also possible to edit the files in a text editor to include additional COMSOL commands or general MATLAB® commands. Running model files in the M file format requires LiveLink™ for MATLAB®.

With a license for LiveLink™ for Excel®, you can save models on the Visual Basic for Applications (VBA) format for use with Excel®.

Complied C-code can be linked with a model or application in several ways including the External Material and External Function interfaces in the Model Builder and as the External Library interface in the Application Builder.

Formato file Estensione Lettura Scrittura
MATLAB®: Model file for MATLAB® .m No
MATLAB®: Function1 .m No
Java®: Archive File .jar6 No
Java®: Compiled model file for Java® .class No
Java®: Model file for Java® .java No
C: Function .dll3, .so4, .dylib5 No
Excel®2 .xlsx,.vba

1Richiede LiveLink™ for MATLAB®
2Richiede LiveLink™ for Excel®, disponibile solo per Windows®
3Disponibile solo per Windows®
4Disponibile solo per Linux®
5Disponibile solo per Mac OS X
6Can be linked to a method in an application using the Application Builder

Formato dati per interpolazioni

The grid, sectionwise, and spreadsheet file types can be read for defining interpolation functions. The sectionwise and spreadsheet file types can furthermore be read and used for defining interpolation curves and written for exporting results. In addition, tables can be copy-pasted on spreadsheet format.

Parameters and Variables can be imported and exported to the Plain text, Comma-separated values, or Data file types.

The Continuous and Discrete color table text file types are used for user-defined color tables for Results visualization.

Digital Elevation Model (DEM) files can be read and used as a Parametric Surface for defining a Geometry.

Formato file Estensione Lettura Scrittura
Copy and paste spreadsheet format n/a
Excel® spreadsheet1 .xlsx
Table .txt, .csv, .dat
Grid .txt
Sectionwise .txt, .csv, .dat
Spreadsheet .txt, .csv, .dat
Parameters .txt, .csv, .dat
Variables .txt, .csv, .dat
Continuous and Discrete color table .txt No
Point data for Cut Point data sets .txt No
DEM .dem No
VTK .vtu No

1Requires LiveLink™ for Excel®, available for Windows® only