color laser printer microdot forensic decoder — free browser tool | fatcousin

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drop high-res scan · yellow microdot detection · xerox grid heuristics · serial/date decode when possible · runs locally

investigative tool only. implements EFF-documented yellow-dot detection heuristics — not all printer manufacturers decode fully. use 600+ dpi scans of lightly printed white areas.

document scan

drop scan image

or click

Select file

yellow threshold

yellow signal = R+G−B−255 · higher threshold = fewer false positives

drop high-res scan of printed document (600+ dpi jpeg/png)