Example
New arrivals this week
𝗡𝗲𝘄 𝗮𝗿𝗿𝗶𝘃𝗮𝗹𝘀 𝘁𝗵𝗶𝘀 𝘄𝗲𝗲𝗸
How it works
Each letter is swapped for a look-alike character from the Unicode “Mathematical Alphanumeric Symbols” block. These are real characters, not formatting, so the bold look survives copy and paste. Only A–Z, a–z, and 0–9 have bold versions; everything else stays as it is.
Things to know
Screen readers may read these characters oddly or skip them, and search engines don’t treat them as ordinary words. Use them for a word or two of emphasis, not for whole posts, usernames you want people to search for, or anything that needs to be accessible.
Four bold styles
You get bold sans-serif, bold serif, bold italic sans-serif, and bold italic serif. Sans-serif bold usually blends best with the interface fonts of Instagram, X, and LinkedIn. Serif bold looks more traditional and stands out more in a feed.
Apps that already have real bold
Some apps format text themselves, and their built-in bold is better because it stays searchable and accessible. In WhatsApp, wrap text in asterisks (*bold*). In Discord, Reddit, and other places that use Markdown, use two asterisks (**bold**). Word processors and email apps have a bold button or Ctrl+B (Cmd+B on a Mac). Use Unicode bold where none of those work, such as social bios and post captions.