Excel
Modern Excel file are technically 'just' zipped XML files, but they are so complex the usual manual editing is not feasible.
Separator-delimited text formats (CSV, TSV): one record per line with columns split by a delimiter — a common way to carry simple edge or adjacency lists.
Read-only Tools
Frequently Asked Questions
What is a Microsoft Excel file?
A Microsoft Excel file stores a graph — its nodes, edges and attributes — in the Microsoft Excel format. See the feature table above for what it supports.
How do I open a Microsoft Excel file?
Open it in a graph tool that supports Microsoft Excel, or convert it to a format your tool reads. With GraphInOut you can convert Microsoft Excel to GraphML, DOT, Connected JSON and more, right in your browser.
How do I convert a Microsoft Excel file to another format?
Use the Convert from Microsoft Excel link above: upload or paste your Microsoft Excel file (input preset to Microsoft Excel), choose a target format and download the result — free, no install.