Go grab something you printed in color. Now shine a blue LED light on it. See those tiny yellow dots in a grid pattern across the entire page? Those are Machine Identification Codes.
Your printer put them there without asking. Every color laser printer from Xerox, Canon, HP, Brother and Epson does this. Every single page. Every single time.
The dots are roughly one-tenth of a millimeter wide, printed in yellow on white paper so you’ll never notice them. They encode your printer’s serial number, the exact date and the exact time you hit “Print.”
🖨️ Not spooling around
The pattern repeats about 150 times across a single sheet, so even a torn scrap of paper carries enough data to trace it back to your machine.
This started in the mid-1980s when Xerox and Fuji developed the system to fight counterfeiting. Color printers were getting good enough to copy money, and governments told manufacturers: Build in tracking, or we won’t let you sell these things.
So they did. And they never told you. A Xerox spokesperson later admitted they “didn’t advertise it much.” You think?
Toner or later, you had to know
In 2017, NSA contractor Reality Winner printed a classified document about Russian election interference and mailed it to a news outlet. The outlet published the scanned pages without removing the yellow dots. Security researchers inverted the colors and decoded the pattern in minutes: printer model 54, serial number 29535218, printed May 9, 2017, at 6:20 p.m.
The NSA matched that to their printer logs. Winner got five years in federal prison. Her printer testified against her.
Here’s the thing. You don’t have to be leaking government secrets to care. Every color page you’ve ever printed has your printer’s fingerprint on it. Medical documents. Financial records. That anonymous letter to your HOA. (Yep. Traceable.)
What you can do: Use a black-and-white laser printer for anything sensitive. Monochrome printers typically don’t include tracking dots since they lack yellow toner. If you’re on a color printer, know every page is signed.
📊 Post this stat: Researchers analyzed 106 printer models from 18 manufacturers. Every. Single. One. They all had some form of hidden tracking code on every page printed. GetKim.com
Share this with someone who prints anything personal. They have no idea their printer is doing this. Nobody does. That’s kind of the whole point.