What is styled text, and why is it not a font?
Styled text is plain text written with different Unicode characters rather than a font. These ten tools swap each letter for its bold, cursive, small-capital, bubbled, upside-down or struck-through equivalent, so the styling survives being copied into a bio, a post or a message that has no formatting.
Every one of these tools exists because a text field would not let you have formatting. A social bio has no bold button. A username field has no italics. A comment box strips your markup. So people reach for the workaround: instead of formatting the letter A, use a *different letter* that already looks bold — U+1D400, which Unicode calls "mathematical bold capital A" and which was added so that a physics paper could tell a vector from a scalar.
That is the whole trick, and knowing it is the difference between using these tools well and being confused by them. Nothing here is a font. Your text is not being styled; it is being replaced, character by character, with different characters that happen to look styled. They travel anywhere plain text travels, which is the point. They also carry every consequence of being different characters, which is the part most generators never mention.
So this page mentions it. Search will not match a cursive word against its plain spelling. A screen reader will announce it letter by letter, or skip it. Some devices have no glyph for the rarer styles and draw a box. Most of these alphabets have no digits at all, so your numbers come through untouched. And a 30-character line can arrive at a 30-character limit already over it, because most of these letters count as two.
The ten tools split by what they actually do to your characters. Six swap each letter for a different one. Two add an invisible mark to the letters you already have, so the letters stay exactly as they were. Two do neither — they draw your word out of other characters, or bold only part of each word. Each tool's readout reports the change in the terms of its own group, so if the wording is not what you expected, that is the fastest signal you are on the wrong tool.
And nothing is uploaded. Every conversion is a lookup table running in your own browser, with your original still on screen beside the result.