What Stable Diffusion writes into the files it gives you, what survives sharing, and how to remove it without touching quality.
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Stable Diffusion is the generator that leaks the most, and almost nobody realises it, because the interfaces built around it write your entire prompt into the image file by default.
Automatic1111 stores a text chunk in the PNG with the full positive and negative prompt, the sampler, the seed, the CFG value and the model hash. ComfyUI goes further and embeds the complete node workflow as JSON. Anyone who opens the PNG in a text editor can read all of it. There is no C2PA manifest and no signature: this is generation data, not provenance.
Convert or clean the PNG and the text chunk goes with it, since our cleaner writes a fresh file from the decoded pixels. If you share Stable Diffusion output regularly, make this a habit rather than an afterthought, because prompts often contain client names and unreleased ideas.
Remove every metadata block without re-encoding. Runs in your browser, nothing is uploaded.