Skip to content
TextArray
100% local

Double-struck text

Convert text to mathematical double-struck characters, also known as blackboard bold.

Input
Output
Related tools
Fancy text generatorStylish text
Cursive textnewStylish text
Gothic textnewStylish text
Monospace textnewStylish text
Mirror textnewStylish text
Normalize Unicode textStylish text
Double-struck text
Double-struck text, also called blackboard bold, is a mathematical typographic style where letters and numbers are rendered with thick double-stroke outlines. It resembles the characters mathematicians write on a whiteboard, giving text a formal academic appearance. Paste any text and this tool instantly transforms all letters and digits into their double-struck Unicode equivalents.
The transformation works on individual characters: uppercase A–Z, lowercase a–z, and digits 0–9 all have dedicated Unicode mappings. Some characters like C, H, N, P, Q, R, and Z use special mathematical symbols from the Unicode standard rather than continuous sequences, creating the authentic double-struck appearance. Spaces, punctuation, and non-ASCII characters like accented letters and emoji pass through unchanged, so only the letters and numbers are styled.
The result is real Unicode text, not an image or styled HTML — you can copy it, paste it anywhere, and send it to other tools. Everything runs in your browser, so your input is never uploaded or processed on a server. The live tally below the output counts the characters transformed. Use double-struck text for mathematical notation in documents, making your text stand out on social media, or simply creating a unique stylish appearance.
FAQ
What is double-struck text?
Double-struck text, or blackboard bold, is a typographic style with thick double-stroke letters that resembles characters written on a whiteboard or blackboard. It has a formal academic and mathematical feel.
Which characters are transformed?
All uppercase letters (A–Z), lowercase letters (a–z), and digits (0–9) are mapped to their double-struck Unicode equivalents. Everything else — spaces, punctuation, accented characters, and emoji — remains unchanged.
Can I use this for other languages?
Only the English alphabet and digits 0–9 are transformed. Accented letters, emoji, and non-Latin scripts pass through as-is, so non-English text will be only partially styled.
Is my text uploaded anywhere?
No. The transformation runs entirely in your browser and your text never leaves your device.