gmsh - Man Page

3D finite element mesh generator with built-in CAD engine and post-processor


gmsh [file(s)] [option(s)]


Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric input and advanced visualization capabilities.

Gmsh is built around four modules: geometry, mesh, solver and post-processing. The specification of any input to these modules is done either interactively using the graphical user interface, in ASCII text files using Gmsh's own scripting language (.geo files), or using the C++, C, Python or Julia Application Programming Interface (API).

Geometry Options


Output model, then exit.

-tol float

set geometrical tolerance.

Mesh Options

-1,  -2,  -3

perform 1D, 2D or 3D mesh generation, then exit.

-o file

specify output file name.

-format string

set output mesh format (auto, msh, msh1, msh2, msh4, unv, vrml, stl, mesh, bdf, med, ...).


use binary format when available.


save all elements (discard physical group definitions)

-algo string

select mesh algorithm (meshadapt, del2d, front2d, del3d, front3d, hxt, ...).


save nodes with their parametric coordinates.

-part int

partition the mesh after batch mesh generation.

-smooth int

set number of mesh smoothing steps.

-order int

set mesh order.

-clscale float

set global mesh element size scaling factor.

-clmin float

set minimum mesh element size.

-clmax float

set maximum mesh element size.

-rand float

set random perturbation factor.

-bgm file

load the post-processing view in file as the current background mesh.


perform various consistency checks on mesh.

Post-Processing Options


combine input views into multi-time-step ones.

Display Options


hide all meshes and post-processing views on startup.

-fontsize int

specify the font size for the GUI.

-display string

specify display.

Other Options


parse input files, then exit.


create new model before merge next file.


merge next files.


ppen next files.

-a,  -g,  -m,  -s,  -p

start in automatic, geometry, mesh, solver or post-processing mode.


print pid on stdout.

-listen string

always listen to incoming connection requests on the given socket (a default socket is used if not specified).

-v int

set verbosity level.


don't popup dialog windows in scripts.

-setnumber name value

set constant number name=value

-setstring name value

set constant string name=value

-string string

parse option string at startup.

-option file

parse option file at startup.

-convert files

Convert files into latest binary formats, then exit.


show version number.


show detailed version information.


show help message.


Christophe Geuzaine ( and Jean-Francois Remacle (

See Also

Gmsh examples (/usr/share/doc/gmsh),
Gmsh homepage (

The full documentation for Gmsh is maintained as a Texinfo manual.  If the info and gmsh programs are properly installed at your site, the command

info gmsh

should give you access to the complete manual.

Referenced By


25 April 2022 4.10 Gmsh Manual Pages