No, it uses Unicode characters that look styled, so they work without installing fonts.

Why do some apps show boxes?

A few platforms don't render every Unicode block; try a different style if so.

Unicode Text Styler

Turn text into 𝗯𝗼𝗹𝗱, 𝘪𝘵𝘢𝘭𝘪𝘤 and fancy Unicode fonts.

Bold𝗧𝗼𝗼𝗹𝘇𝘆 𝟭𝟮𝟯

Italic𝘛𝘰𝘰𝘭𝘻𝘺 123

Bold italic𝙏𝙤𝙤𝙡𝙯𝙮 123

Monospace𝚃𝚘𝚘𝚕𝚣𝚢 𝟷𝟸𝟹

Script𝒯𝓄𝓄𝓁𝓏𝓎 123

Double-struck𝕋𝕠𝕠𝕝𝕫𝕪 𝟙𝟚𝟛

StrikethroughT̶o̶o̶l̶z̶y̶ ̶1̶2̶3̶

UnderlineT̲o̲o̲l̲z̲y̲ ̲1̲2̲3̲

Convert plain text into styled Unicode look-alikes — bold, italic, monospace, script and more — that you can paste into social media.

Is this a real font?: No, it uses Unicode characters that look styled, so they work without installing fonts.
Why do some apps show boxes?: A few platforms don't render every Unicode block; try a different style if so.