Two JSON records may travel with the pixels
ComfyUI commonly writes a prompt entry describing the graph sent to execution and a workflow entry describing the editable canvas. Both normally live in PNG text chunks and can be much larger than ordinary image metadata.
What the viewer indexes
The local reader counts prompt and workflow nodes, finds text supplied to common text-encoding nodes, and collects model, VAE, LoRA, seed, sampler, and scheduler fields when their input names follow supported conventions.
| Record | Use |
|---|---|
| Prompt graph | Execution inputs and node connections used for a generation. |
| Workflow | Canvas layout and editable graph intended for reopening in ComfyUI. |
| Text prompts | Strings attached to supported text-encoding nodes. |
| Model fields | Checkpoint, VAE, and LoRA names stored in node inputs. |
Why a workflow may be absent
The image may have been exported without metadata, converted to another format, optimized by a website, copied through a messaging service, or captured as a screenshot. A missing graph is not evidence that ComfyUI was never used.
Local by design
The file is parsed in your browser. Workflow JSON and prompts remain inside the tab unless you explicitly download the report.