ComfyUI, the node-based Stable Diffusion interface, commonly embeds your entire generation graph — every node, model, LoRA, and connection in your workflow — as JSON inside a PNG text chunk (typically under a workflow or prompt key). That's a significantly larger exposure than a simple prompt string: it can reveal your exact custom pipeline, model combinations, and sometimes local file paths.
A standard AUTOMATIC1111-style export writes a single text block with your prompt and generation settings (see our Stable Diffusion metadata guide). ComfyUI's node-graph architecture means the embedded data can be the complete recipe for your workflow — reproducible end to end by anyone who opens the file in ComfyUI and loads its embedded workflow directly from the image, which is in fact a feature ComfyUI offers by design (drag an image back into the canvas to reload the workflow that made it).
Because the workflow-embedding feature is genuinely useful for sharing reproducible setups with collaborators, it's easy to forget that the same convenience means every image you export to a public platform carries your whole pipeline unless you deliberately strip it first.
Since this is stored as ordinary PNG text-chunk data (not a signed manifest), AiEraser can show you what's embedded in View mode and remove it entirely in Remove mode — the canvas re-encoding process drops the workflow JSON along with everything else, since it only preserves pixel data.
This reflects ComfyUI's well-documented workflow-embedding convention, a core feature of the application. Custom nodes and configurations can alter exactly what's stored — check your own exports with a metadata viewer.