Reference

What each AI tool writes into your images

There is no single standard. Each generator picked a different container, which is why a checker that only looks for C2PA misses most of this. One page per tool, with the actual field names.

• MidjourneyXMPPrompt text and seed in XMP
• ChatGPT & DALL·EC2PASigned OpenAI content credentials
• Stable DiffusionPNG textFull generation parameters in PNG chunks
• ComfyUIPNG textEntire node workflow as JSON
• Photoshop Generative FillC2PA + EXIFPartial-edit credentials on real photos
• Lightroom AI DenoiseEXIF + XMPDenoise and masking markers on raw edits
• Adobe FireflyC2PA + IPTCContent credentials and AI source type
• Canva AIXMP + C2PAVaries by export path
• Google Gemini & ImagenC2PA + SynthIDCredentials plus an invisible pixel watermark
• Leonardo AIXMPGeneration signatures in XMP