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The trick: it's not a font
When a font generator turns "hello" into 𝗵𝗲𝗹𝗹𝗼 or 𝓱𝓮𝓵𝓵𝓸, no font is involved. Fonts can't travel inside a plain-text field — an Instagram bio or a tweet accepts only characters. The trick is that Unicode, the universal character catalog, happens to contain thousands of alternate letterforms: the Mathematical Alphanumeric Symbols block defines complete bold, italic, script, fraktur, double-struck, and monospace alphabets — intended so mathematicians can distinguish a bold-italic 𝑯 from a plain H as semantically different symbols in formulas. A "font generator" simply maps each of your letters to its counterpart in one of those alphabets. The result looks styled but is, to every computer system, a string of entirely different characters.
That distinction — looks like styled text, is different characters — explains every strength and every problem that follows.
Why it works at all
Because the substitution happens at the character level, the styled text survives anywhere text survives: bios, usernames, comments, plain-text emails, filenames. No HTML, no CSS, no permissions — which is exactly why these generators exist. Platforms that strip formatting can't strip this, because there's no formatting to strip.
The costs, honestly
Screen readers. This is the serious one. Assistive technology may read 𝗵𝗲𝗹𝗹𝗼 character-by-character as "mathematical bold small h, mathematical bold small e…", announce nothing useful, or skip the run entirely — varying by screen reader and platform. A decorated bio can be an unintelligible one for a blind user. If the text carries information anyone needs, the accessible choice is plain text, full stop. Decoration is defensible only when the same information is also available undecorated.
Search and matching. To software, 𝗵𝗲𝗹𝗹𝗼 ≠ hello. In-page search, platform search, @-mention matching, and spam filters treat them as unrelated strings — some platforms' search normalizes them, many don't. Styled keywords are, functionally, invisible keywords.
Rendering. Coverage of these Unicode blocks varies by device and font stack. What renders as elegant script on your phone may appear as tofu boxes (□□□□) on an older device or minimal system. The characters outside the Basic Multilingual Plane — which includes most of these alphabets — historically had the patchiest support, which is why our generator honestly badges which styles ride on that riskier territory instead of promising universal compatibility.
Weight. Each such character costs more bytes and, on platforms with character limits, sometimes counts differently than the letter it mimics.
Sensible use, in one paragraph
Use Unicode styling as seasoning on non-essential text: a decorative flourish in a bio next to a plain-text description, a stylized header above normal body copy, playful usernames among friends. Don't use it for information that must be found, read aloud, or understood — names people will search for, instructions, links' surrounding context, anything professional where a rendering failure looks broken. And prefer styles closer to plain letters (bold, italic) over heavily decorated ones when in doubt — they degrade more gracefully everywhere.
Getting back to plain text
One more practical note: because the mapping is systematic, it's reversible. Unicode defines a normalization form (NFKC) that folds most of these "compatibility" characters back to their plain equivalents — 𝗵𝗲𝗹𝗹𝗼 normalizes to hello — which is exactly what the "copy as plain text" option in our font generator does, with manual maps for the styles (like upside-down text) that normalization doesn't cover. If you've received decorated text you need in searchable, accessible form, that round trip is the cure. Styled Unicode is a fun costume for text — the important thing is knowing it's a costume, and knowing when the occasion calls for plain clothes.