How do I make text bold on X (Twitter)?

X has no bold button. Copy a bold line from above and paste it. Each bold letter counts as 2 toward the 280 limit.

Sans bold or serif bold?

Sans bold (𝗕𝗼𝗹𝗱) matches the look of most apps; serif bold (𝐁𝐨𝐥𝐝) looks more like a book. Both have bold digits.

Does bold text hurt accessibility?

It can. Screen readers may announce each letter's character name. Keep it to a few words.

Bold Text Generator — 𝐁𝐨𝐥𝐝 Copy and Paste (for Bios, LinkedIn, X)

Use real bold when the app has it

Discord, WhatsApp, Slack, Reddit and most email apps already have real bold (in Discord and Reddit it’s **two asterisks**, in WhatsApp *one*). Real bold is formatting: everyone’s screen reader reads the word, and search finds it. Unicode bold is a set of math symbols that look bold. It is the right tool where there is no formatting at all, like an X post, a LinkedIn headline or an Instagram bio.

𝐁U+1D401Mathematical Bold Capital B

𝐨U+1D428Mathematical Bold Small O

𝐥U+1D425Mathematical Bold Small L

𝐝U+1D41DMathematical Bold Small D

“Bold” in math bold: four characters, each with its own name.

One habit makes Unicode bold kinder: bold a few words for emphasis, never a whole paragraph. A screen reader that spells out character names turns a bolded paragraph into minutes of noise.

Sources: Per Axbom, “Don’t fake bold and italic text with Unicode”; Unicode Standard, Mathematical Alphanumeric Symbols chart.

Questions

How do I make text bold on X (Twitter)?: X has no bold button. Copy a bold line from above and paste it. Each bold letter counts as 2 toward the 280 limit.
Sans bold or serif bold?: Sans bold (𝗕𝗼𝗹𝗱) matches the look of most apps; serif bold (𝐁𝐨𝐥𝐝) looks more like a book. Both have bold digits.
Does bold text hurt accessibility?: It can. Screen readers may announce each letter's character name. Keep it to a few words.