What I love about Draw.io is its ability to use editable PNGs — an image containing the raw diagram data.

This allows you to publish a self-contained image file. And as the diagram is contained within the image, anybody with Draw.io can update it.

The PNG image file format supports embedded metadata in a number of ways. diagrams.net can export a PNG image of your diagram and include the diagram itself in the image, by including the XML code in the zTxt section of the image file.

Embedding the diagram as metadata in an image lets you more easily transfer the file between products, vendors, and platforms without data loss. By including the diagram, the image retains all of the data necessary to continue working on it in diagrams.net editor.