This is not steganography
A prompt is usually not hidden in pixels. The generator writes a text chunk or EXIF/XMP field so the creator can restore settings later. Any compatible metadata viewer can read it when an upload platform has not removed it.
AUTOMATIC1111 may record positive and negative prompts, seed, sampler, steps, CFG, dimensions and model. Its project documentation describes PNG Info as a text chunk, and its settings can disable metadata infotext; other output formats should be checked separately.
ComfyUI can reveal the whole workflow
Native ComfyUI PNGs commonly carry prompt and workflow data. That convenience lets a creator drag an image back into the interface to restore the graph. It can also expose model and LoRA names, node parameters and instructions. Conversion or social uploads may remove the data, but you should verify rather than assume.
- Look for PNG text chunks named parameters, prompt or workflow.
- In JPEG, check EXIF UserComment, ImageDescription and XMP.
- Review the complete field list, not only a friendly summary.
What about Midjourney?
Midjourney’s job interface lets a creator copy a prompt, Job ID and seed. Creation visibility also depends on account and privacy settings. That does not mean every downloaded Midjourney JPEG is guaranteed to carry the complete prompt in EXIF. A public job history and embedded file metadata are separate disclosure channels.
The accurate question is whether parameters are available from this particular file or a linked public page. An image interrogator can sometimes guess a description, but it cannot reliably recover the creator’s exact original prompt.
Checklist before client delivery
Create a separate publication copy and inspect it locally. Remove only fields you do not intend to disclose, while keeping the generation original in a private archive. Blind stripping can destroy useful process or licensing evidence.
- Check prompt, negative prompt, seed, model, workflow and local file paths.
- Make sure comments contain no client names, tokens, internal URLs or draft instructions.
- Inspect again after conversion because a new container may preserve some XMP.