graphml2gv

Convert a graph from gml to gv format

$ graphml2gv -o [output.gv] [input.gml]

$ cat [input.gml] | graphml2gv > [output.gv]

$ graphml2gv -?

graphml2gv [ -? | -h ] [ -v ] [infile [outfile]]

-?
    Print usage information

-h
    Print usage information

-v
    Enable verbose output

infile
    Input GraphML file (stdin if omitted)

outfile
    Output DOT file (stdout if omitted)

graphml2gv is a command-line utility from the Graphviz suite that converts GraphML files—an XML-based graph interchange format—into Graphviz's DOT (.gv or .dot) language. GraphML supports nodes, edges, and attributes, making it popular in tools like yEd or Gephi. This tool bridges GraphML data with Graphviz's layout engines (dot, neato, fdp), enabling visualization, analysis, or further processing.

It reads from infile (or stdin) and writes to outfile (or stdout), mapping basic GraphML elements to DOT syntax. Node/edge labels, IDs, and common attributes are preserved where possible. Ideal for network analysts, data scientists, or developers importing graphs from diverse sources into Graphviz pipelines.

Limitations include partial support for complex GraphML features like hyperedges or custom namespaces, focusing on core directed/undirected graphs.

Supports basic GraphML only; limited attribute mapping and no hyperedge/extension support.
May require Graphviz version ≥ 2.28.

Convert file:
graphml2gv input.graphml > output.dot
Visualize:
dot -Tpng output.dot -o graph.png

Install via package manager:
Debian/Ubuntu: sudo apt install graphviz
Fedora: sudo dnf install graphviz

Introduced in Graphviz 2.28 (2009) to enable GraphML import. Maintained as part of the open-source Graphviz project for graph processing interoperability.

dot(1), neato(1), gvpr(1), graphviz(1)