Fancy Unicode Text

Maps each ASCII letter (and digits, when supported) to its visual look-alike in Unicode's Mathematical Alphanumeric Symbols range. The result keeps its style when copy-pasted into chat, social media, plain-text email — anywhere a real bold tag wouldn't survive. The script and Fraktur forms route around the BMP "holes" where letters like ℋ, ℬ, and ℜ already exist as letterlike symbols.

Those holes are the awkward part of the block. When Unicode encoded the mathematical alphabets it found that a couple of dozen letters had already been assigned years earlier as letterlike symbols, so rather than duplicate them it left gaps and scattered the missing glyphs elsewhere in the BMP. A naive offset calculation lands in those gaps and emits a reserved codepoint, which renders as a blank box. The mapping here substitutes the correct scattered character instead, which is why script and Fraktur come out complete.

Not every style covers digits. Bold, double-struck, sans-serif and monospace have their own digit sets, but italic, script, Fraktur and several others do not, so digits pass through as ordinary ASCII and a styled word containing a number comes out visibly mixed. The tool leaves those digits as they are rather than silently substituting something close.

The cost of this approach is that the output is no longer the letters you typed. Screen readers announce many of these codepoints as "mathematical bold small a" or skip them, search does not match them against the plain word, and a username or display name made of them is unsearchable by the name people expect. Several platforms also reject them in profile fields or normalise them away. These are decorative substitutions for running text, and where actual emphasis is meant, real markup remains both more accessible and more robust.