Remove Stable Diffusion metadata from a PNG or export

Automatic1111 writes parameters

The default PNG save adds a tEXt chunk whose key is parameters. The value is one text block: positive prompt, negative prompt, steps, sampler, CFG scale, seed, width and height, model name, and model hash, plus whatever an extension appended. Anyone who opens PNG info can read it. There is no signature and no C2PA manifest in that chunk.

AI provenance mode on the tool above deletes PNG text chunks whose keys are parameters, prompt, sd-metadata, Comment, or Software. Press Inspect only first so you see the key name. Press Clean this file and download only when that line is gone from the After column. The checker for “what is in the file before I decide” is how to check photo AI metadata.

ComfyUI writes prompt and usually workflow

ComfyUI’s save path stores the API prompt as a text chunk named prompt, and the UI graph as a text chunk named workflow, unless metadata was disabled on the server. The prompt chunk is in the AI provenance key list. The workflow chunk is not. A workflow JSON can be large, and it can include checkpoint paths and LoRA filenames from the machine that rendered it. That is a reason to remove it before you post the PNG, separate from any social label.

If the After report still shows Text chunk (workflow), switch the mode to Strip all detected metadata and verify again. Strip-all drops tEXt, iTXt, and zTXt chunks. Privacy mode also drops textual chunks, and it drops EXIF and C2PA. Use the After column, not the mode name, as the proof.

JPEG and WebP hide the same recipe in EXIF

When the UI saves a JPEG or WebP, the parameters often move into an EXIF comment rather than a PNG key. AI provenance will not throw away ordinary EXIF just because the comment looks like a prompt. The After report will still list EXIF. Run strip-all for that export. WebP XMP is removed by strip-all as well.

This is the opposite default from a ChatGPT download, where the thing you came to delete is a C2PA manifest and AI provenance is enough for that manifest. OpenAI’s watermark problem is ChatGPT image metadata. A signed manifest, if you added a C2PA node yourself, is Content Credentials and remove C2PA. Stock Stable Diffusion output does not grow a manifest by itself.

What you should not expect

• The seed cannot be reconstructed from the pixels after the chunk is gone. It also cannot be reconstructed by this tool if you only have a screenshot.
• No pixel watermark is removed. If a model or an extension embedded one, it stays.
• Instagram, Facebook, and TikTok do not read your parameters chunk as a Settings toggle. They can still label the upload. A clean file does not force the badge off.
• MP4 and the ComfyUI video saves are out of scope. Export a still JPEG, PNG, or WebP.

Midjourney’s site download is a different container, usually not this PNG key: Midjourney export metadata. One file is free. A folder of PNGs is the batch unlock.

Running ComfyUI and sitting on a full output folder? The measured prompt and workflow behaviour, and the folder steps, are on remove metadata from ComfyUI images.

Questions

What is in the Automatic1111 parameters chunk?

The prompt, negative prompt, sampler settings, seed, size, and model details, as plain text. AI provenance removes that chunk from a PNG.

Why is workflow still listed?

AI provenance targets named generation keys, including prompt, and does not treat every text key as one of them. Strip-all removes the remaining PNG text chunks. Verify before you download.

Why did a JPEG keep the prompt?

The recipe is in EXIF. AI provenance keeps that segment. Strip-all removes it.

Does a cleaned file lose its platform label?

No. You removed a recipe from the file. You did not remove a watermark, and you did not change a label the platform applies on its own.

The general PNG picture, with a table of every chunk type and what each mode leaves, is on remove metadata from PNG.

Stable Diffusion PNG metadata is the parameters chunk and the prompt text. A leftover workflow chunk can still need the all-metadata mode. That Stable Diffusion PNG metadata sits beside the pixels, so a watermark is a different problem.