Free online GRAPHMLZ to GRAPHML converter

Source format

GraphMLZ is a compressed GraphML file. GraphML is an XML-based format used to describe graphs, including nodes, edges, attributes, and metadata. In practice, the .graphmlz extension usually indicates that a GraphML file has been compressed, most often with gzip, though some files may use another compression wrapper depending on the software that created them.

GraphMLZ files are commonly used when graph data needs to be stored in less space or transferred more efficiently.

Target format

GraphML is the uncompressed XML version of the same graph data. It is widely supported by graph tools such as yEd, Gephi, NetworkX, and other graph-processing applications. Its main advantages are readability, interoperability, and easier inspection or editing with text-based tools.

GraphML is often used for exchanging graph data between applications, archiving graph structures, and importing graphs into visualization or analysis software.

How to convert GraphMLZ to GraphML

The conversion is usually a decompression step: extract the compressed file to recover the plain .graphml XML file. If the file is gzip-compressed, standard decompression tools will work.

On Linux or macOS, you can often use the command line:

gunzip graph.graphmlz

If the decompressed file keeps the original name or does not end in .graphml, rename it if needed:

mv graph.graphmlz graph.graphml

On Windows, use an archive utility such as 7-Zip. Right-click the file and choose 7-Zip → Extract Here or 7-Zip → Extract to "graph/". If the extracted file does not already have the correct extension, rename it to .graphml.

If you prefer a desktop application, yEd can open GraphML files and may also handle compressed variants depending on the file and version. Another practical option is to decompress first, then open the resulting .graphml file in your graph software.

You can also convert the file on 101convert.com for free, without installing any software.

Notes on compatibility

This conversion is lossless, so the graph data itself should not change. The main issue is compatibility: some programs expect a plain .graphml file and will not recognize the compressed .graphmlz variant.

If decompression fails, the file may not actually be gzip-compressed, or it may be corrupted. In that case, try opening it with a different archive tool or verify that the file was created correctly.

Because GraphML is XML, you can inspect the result in a text editor to confirm that it begins with XML content such as <?xml and contains GraphML elements like <graphml>.