Look closely at a 0 and an O, a 1 and an l, a 2 and a Z: the shapes are cousins. Unicode an alphabet with thousands of characters, so for almost every digit there is a sibling that shares its silhouette without being a digit at all. A fake number leans on those twins - it reads naturally to human eyes while being composed of entirely different characters. This is the same homoglyph trick that makes a word like 0ption different from Option, applied to whole numbers.
Create Fake Numbers replaces every digit with a look-alike from one of four Unicode families: letter twins (O for 0, Z for 2, B for 8), mirrored upside-down glyphs for a calculator-flip look, fullwidth digits that occupy double width, or circled digits wrapped in rings. Paste up to 1000 numbers, pick a style, generate, and preview each original beside its disguised twin. The output copies as plain Unicode text into any field, or downloads as a text file. Everything happens locally in the browser - nothing is uploaded, stored or logged.