Try it now: AI Metadata Inspector
Free, no login — upload an image and read its embedded metadata in your browser.
What to know
When ComfyUI saves a PNG, it writes the entire workflow graph and the flattened execution prompt into the file as PNG text chunks (a "workflow" key and a "prompt" key). That means the prompt, seed, model, sampler, and node graph all travel inside the image itself — nothing is stored elsewhere.
The catch is fragility: those chunks only survive while the file stays a PNG. Converting to JPEG or WebP, or re-saving through an editor that drops custom chunks, deletes the workflow. If you still have the original PNG, recovery is reliable; if you only have a converted copy, the embedded data is gone.
How to recover it
- 1
Confirm you have the original PNG
Recovery works from the file ComfyUI saved. A JPEG/WebP copy, a screenshot, or a social-media download will have lost the chunks.
- 2
Drag the PNG back into ComfyUI
Dropping the original PNG onto the ComfyUI canvas reconstructs the full workflow, including the prompt and every node parameter.
- 3
Or read the text chunks with a metadata viewer
Upload the PNG to the AI Metadata Inspector to read the embedded "prompt" and "workflow" chunks without opening ComfyUI.
- 4
Save the recovered prompt somewhere durable
Copy the recovered prompt and parameters into your library so a future format conversion cannot lose them again.
Importing ComfyUI output into a catalog that extracts the workflow on arrival means the prompt is preserved centrally — so a later JPEG export can never be the only copy.
Frequently asked questions
Frequently Asked Questions
Quick answers to the most common questions.
Related recovery guides
Never lose a prompt again
Numonic extracts the prompt, model, seed, and settings from every AI image on import and keeps them searchable — so recovery stops being a rescue mission and the prompt is always attached to the work.