Delete Stable Diffusion prompts, ComfyUI workflows, C2PA and text chunks from PNG files — keeping every pixel and transparency intact.
🔒 Your files never leave your device — processing happens in your browser.
What hides in a PNG
PNG files are made of chunks. Only a few are needed to display the image (IHDR, PLTE, IDAT, IEND and
transparency/color chunks). Everything else is optional: tEXt, iTXt and zTXt text chunks, eXIf,
XMP, timestamps and the caBX chunk that carries C2PA.
AI tools love text chunks. Stable Diffusion WebUI (Automatic1111, Forge) saves a parameters chunk with your full prompt, negative prompt,
seed, sampler and model hash. ComfyUI embeds the entire node workflow as JSON. Anyone can read them by opening the file in a text editor.
Lossless by design
Clean Image Metadata keeps all chunks needed to display the image exactly — including transparency, gamma, color profile and APNG animation — and removes the rest. Because PNG compression is lossless and we copy the image chunks without decoding them, the cleaned file is pixel-perfect.
Frequently asked questions
Will transparency be preserved?
Yes. Transparency (tRNS and alpha) and animation chunks are always kept.
Can I keep my prompt private but still share the image?
Yes — that is exactly what this tool is for. The prompt chunk is removed, the image is untouched.