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Here is a growing collection of tools that can be used in your web browser.
This web app I coded along with Grok 3 (by "with" I mean Grok did 95% of the work).
Anyway with it you can edit images to have a Floyd-Steinberg style dithering effect for a cool retro vibe.
Here is an example of a dithered image, It's one of my 3D y2k art pices with the effect:
