How ComfyUI marks images
ComfyUI embeds the complete node graph JSON in a PNG `workflow` chunk and runtime prompt in a `prompt` chunk (iTXt / tEXt).
What gets embedded in the file
Entire custom workflow graph including custom node names, models loaded, prompt text, and seeds.
Lossless cleaning method
Filters `workflow` and `prompt` chunks, recomputing chunk sequence without modifying pixel chunks (IDAT).
Technical limits and policy
Client-side byte filtering only. Protects proprietary workflows and parameter privacy.
How to Clean ComfyUI Images
Add your ComfyUI file
Drag and drop your JPEG, PNG, or WebP image into Clean on your desktop or mobile browser.
Select your preset
Choose "Remove AI markers only" to drop generation manifests while keeping color profiles and EXIF.
Download clean image
Download your cleaned image with bit-identical pixel data and no embedded generator flags.
ComfyUI Metadata FAQs
What metadata does ComfyUI add to image files?
ComfyUI embeds provenance records, generator tags, and parameter metadata into file headers upon creation or export.
How does Clean remove metadata from ComfyUI images?
Clean parses the file format structure in your browser and drops unwanted metadata blocks without re-compressing image pixels.
Does cleaning ComfyUI files degrade visual quality?
No. Clean operates at the binary level and copies compressed image bytes verbatim, ensuring 100% lossless output.