How to use it
- Type the words you want in bold.
- Pick serif bold, sans bold or another bold style.
- Click Copy on that row.
- Paste it into your post, caption or comment.
How to bold text on Facebook, Instagram and LinkedIn
Social apps format posts for you and don't offer a bold or italic button, so asterisks or Ctrl+B do nothing there. The workaround is to replace the letters themselves:
- Type the word or line you want to stand out.
- Copy the bold style you like from the list.
- Paste it into the post or caption, and type the rest of your text normally.
The bold letters come from Unicode's Mathematical Alphanumeric Symbols block. They are real characters, not formatting, so they look bold to everyone whose device has a font for them, which covers current iPhones, Android phones, Windows and macOS.
Six bold styles and when to pick each
| Style | Example | Good for |
|---|---|---|
| Serif bold | 𝐁𝐨𝐥𝐝 | a classic, bookish headline |
| Sans-serif bold | 𝗕𝗼𝗹𝗱 | clean labels like 𝗡𝗘𝗪 or 𝗦𝗔𝗟𝗘, closest to app text |
| Bold italic | 𝑩𝒐𝒍𝒅 | a quote or a strong aside |
| Sans bold italic | 𝘽𝙤𝙡𝙙 | sporty, energetic headings |
| Bold script | 𝓑𝓸𝓵𝓭 | names and invitations |
| Bold Fraktur | 𝕭𝖔𝖑𝖉 | gothic, metal or vintage themes |
Sans-serif bold blends in best with the system font most apps use, so it reads like a native heading. Serif bold looks more like a printed book. Bold digits also exist (𝟏𝟐𝟑), but keep prices, dates and phone numbers in plain digits so people can copy and search them.
When an app already has real bold
Unicode's own chart notes that these letters are meant for mathematical variables and that ordinary text should use normal letters with formatting. Where an app gives you real formatting, use it: it stays readable for everyone and searchable.
- WhatsApp:
*bold*,_italic_,~strikethrough~. - Messenger: some versions accept the same asterisk style; try it before reaching for Unicode.
- Discord:
**bold**, see the Discord fonts page for the full list. - Word, Google Docs, email: Ctrl+B on Windows, Cmd+B on a Mac.
The generator is for the places with no such option: Facebook and LinkedIn posts, Instagram captions and bios, TikTok profiles and X posts.
Which platforms display it
Every style row carries a compatibility mark for Instagram, TikTok, Discord, Facebook and X. A works mark means the characters are old and widely supported; may break means some devices may show empty boxes or the app may trim the text. These are expectations drawn from the Unicode version and common fonts, not guarantees, since platforms update often.
Bold text is among the safest choices: serif and sans bold have been in Unicode since 2001. Two limits apply on every platform: @handles accept none of these characters, and Facebook will not take them in your profile name, even though posts and comments are fine.
Bold that doesn't lock people out
A screen reader may skip bold Unicode letters or spell them out as "mathematical bold capital H, mathematical bold small e...", which turns a short heading into noise for blind users. The How a screen reader may hear it toggle under the box shows the names it may read for your first characters. Search has the same blind spot: a bolded product name or hashtag won't match a normal search.
Rules of thumb: bold one or two words per post, keep your name, links, prices and hashtags plain, and never write whole paragraphs in bold.
Unicode bold has no accented letters. You can bold the base letter and keep the accent as a combining mark, or leave é, ñ and ü plain. The counter shows characters and UTF-16 code units; each bold letter uses two units, which some apps count against their limit, so check a 150-character Instagram bio after pasting. Nothing you type leaves your browser.
Frequently asked questions
How do you bold text on Facebook?
Facebook posts have no bold option. Type your text here, copy a bold style and paste it into the post. It won't work in your profile name.
Can I bold text in a LinkedIn post?
Yes, by pasting bold Unicode letters. Use it for a heading or a key phrase, and keep the rest of the post plain so it stays readable and searchable.
How do I bold text in WhatsApp?
Put asterisks around the words, like *this*. That is real formatting and is better for accessibility than Unicode bold.
Why can't I search for my bold text?
Bold Unicode letters are different characters from normal letters, so search engines and in-app search often don't match them.
Which bold style looks most natural?
Sans-serif bold, because it is closest to the font most apps already use.
Sources
Last updated: November 13, 2026