How to Extract Prompts from ComfyUI Images: Free PNG Parser & the .deut Standard

If you work with generative AI (like Stable Diffusion) in production, you regularly need to extract a prompt from an image or view generation settings. The basic workflow is well known: drop a generated PNG into the ComfyUI or Automatic1111 interface to reveal the node network. The technical backbone — weights, seeds, and text queries — is physically embedded in hidden tEXt chunks within the binary file as a massive JSON. While convenient for solo work in the moment, using PNGs as a long-term database for architectural studios or design agencies is a highly fragile pattern. This guide explains how our team solved the PNG metadata extraction problem, why we built a free local PNG-parser, and why the visual AI industry needs the open .deut standard . The Trap of ComfyUI Missing Nodes (And Why You Need an Extractor) The power of the ComfyUI ecosystem lies in custom nodes from the open-source community. The downside of this flexibility is fragile dependencies. Over a year or two, packages