Double-struck Font Generator
Outlined blackboard-bold letters with a distinctive double-line stroke.
What is Double-struck Font?
Chalk on a blackboard, where a professor thickens each letter with a second parallel stroke so it survives the back row: that is the origin of this style, often called "blackboard bold". Double-struck Font reproduces it from the Unicode Mathematical Double-Struck range at U+1D538, giving every character that hollow, outlined, doubled-edge appearance mathematicians have used for decades.
The Famous Number-Set Letters
Seven capitals (C H N P Q R Z) are not pulled from the main range but mapped explicitly to their classic Letterlike Symbols forms (ℝ ℂ ℕ and the rest). These are the exact symbols used to denote real numbers, complex numbers and natural numbers in mathematics, so the style stays consistent and recognisably "the math one".
Digits Transform Too
Unlike many outlined styles, this one converts numerals as well. Zero through nine each have dedicated double-struck forms (𝟘 to 𝟡), so a string like 𝕡𝕣𝕠𝕠𝕗 𝟚𝟘𝟚𝟜 comes out fully styled with no plain characters breaking the line. That completeness is part of why it reads as a polished, deliberate aesthetic rather than a half-applied filter.
Who Reaches For This Look
It signals a particular crowd. Maths and physics students, academics, and developers gravitate to the clean outlined feel for bios and headers. Compared with heavier filled styles, the doubled hairline keeps things airy and precise. 𝕥𝕙𝕖𝕠𝕣𝕪 𝕒𝕟𝕕 𝕔𝕠𝕕𝕖 in this treatment looks studious rather than flashy, which is exactly the point for a technical profile.
Double-struck Character Map
Every character Double-struck transforms. Click any row to copy that character.
Where Double-struck Works
Universal support across all major social media and messaging platforms.