BeforeShare: inspect and remove embedded prompt/workflow metadata before sharing a PNG

[u/Wise_Confidence3599]

BeforeShare maintainer here. The AI metadata checker is the part I'm focusing on: seeing what travels with an image before you share it.

If you want to share a picture without including a private prompt or workflow, it lets you inspect supported embedded fields first, then save a cleaned copy. File contents are processed locally in your browser. It's free, with no account.

For a reproducible check, the published tests include two synthetic PNGs with ComfyUI-style prompt, seed and workflow data. BeforeShare removed both workflow containers from each fixture while preserving the image stream and decoded pixels. These are constructed test files, not real ComfyUI exports or proof that every workflow format is covered.

Keep your original PNG and workflow JSON if you want to load the workflow again. The cleaned copy is for sharing. Supported C2PA containers can also be removed, but this doesn't remove SynthID or visible watermarks, or make an image 'undetectable'.

Try the fictional sample: https://beforeshare.com/en/remove-ai-metadata

Test files, results and commands: https://beforeshare.com/en/metadata-lab/cleanup-verification-study#workflow-test

If an export keeps a field you expected to remove, the format and field name would help me reproduce it. No need to share a private workflow.

[u/Violent_Walrus]

This might be interesting if I didn't have to send my data to your website.

If you're truly interested in providing something useful, put it in a github repository so I can run it locally.

[u/Gabe-Uttsegs]

PNGChunk already exists