Double Struck Text Generator
Generate double struck outline text to copy and paste. Hollow blackboard-bold Unicode letters and numbers for bios and usernames.
Example — type your own text above to convert it.
A double struck text generator converts letters into hollow outline characters, producing 𝕕𝕠𝕦𝕓𝕝𝕖 𝕤𝕥𝕣𝕦𝕔𝕜 𝕥𝕖𝕩𝕥 with a distinctive doubled stroke. The style is also called blackboard bold, because it imitates how mathematicians write bold letters in chalk.
Examples
| Input | Output |
|---|---|
| Hello World | ℍ𝕖𝕝𝕝𝕠 𝕎𝕠𝕣𝕝𝕕 |
| Level 100 | 𝕃𝕖𝕧𝕖𝕝 𝟙𝟘𝟘 |
When to use the Double Struck Text Generator
Double struck is one of the few Unicode alphabets that includes a full set of digits, which makes it unusually practical: a username with numbers in it converts cleanly, where bold italic or cursive would leave the digits looking out of place.
The style has a real origin. Mathematicians writing on a blackboard cannot produce a bold stroke with chalk, so they took to doubling one edge of each letter. Typography followed, and the resulting characters became the standard notation for number sets: ℕ for the naturals, ℤ for the integers, ℝ for the reals, ℚ for the rationals, ℂ for the complex numbers.
Those five letters — plus H and P — were encoded before the full alphabet existed, so they sit outside the main block and are drawn in a slightly different weight. You will see it most clearly in ℍ and ℝ.
Frequently asked questions
Does double struck text include numbers?
Yes. Unlike most Unicode alphabets it has a complete set of digits, so usernames and text containing numbers convert consistently.
Why is it called blackboard bold?
Chalk cannot produce a bold stroke, so mathematicians doubled one edge of each letter to imitate bold on a blackboard. Typography copied the convention.
Why do H, N, P, Q, R, Z and C look slightly different?
Those seven were encoded earlier as the standard symbols for number sets, so Unicode left holes in the main block and reuses the older glyphs.