If you have ever scrolled through LinkedIn and noticed posts with bold or italic text that stands out from the surrounding feed, you probably assumed those creators had access to a formatting tool built into the platform. They do not. LinkedIn's post composer is intentionally plain — it strips out HTML and rich text formatting when you paste it in. So how are those bold words getting there?

The answer is Unicode — specifically, a set of mathematical alphanumeric symbols that look like styled letters but are treated as regular characters by every platform that accepts copy-pasted text.

What Is Unicode Bold Text?

The Unicode Standard is a universal character encoding system that assigns a unique number to every character used in written language across the world. Among its thousands of characters are complete sets of mathematical alphanumeric symbols — including a full bold alphabet, a bold italic alphabet, a sans-serif bold alphabet, and more.

These symbols were originally designed for use in mathematical typesetting — representing vectors, matrices, and variables in academic papers. But because they are standard Unicode characters rather than HTML formatting, they travel wherever text goes. You can paste them into LinkedIn, Twitter, Instagram, WhatsApp, and anywhere else that accepts plain text — and the styling is preserved.

The bold "B" you see in LinkedIn posts is not the letter B styled bold — it is the Unicode character 𝗕 (U+1D5D7), which simply looks like a bold B. This is an important distinction because it means the formatting survives copy-paste in a way that HTML never could.

The Different Unicode Styles Available

There are several Unicode font styles that work on LinkedIn:

𝗕𝗼𝗹𝗱 𝗦𝗮𝗻𝘀-𝗦𝗲𝗿𝗶𝗳 — the most popular style for LinkedIn, clean and modern
𝘐𝘵𝘢𝘭𝘪𝘤 𝘚𝘢𝘯𝘴-𝘚𝘦𝘳𝘪𝘧 — great for quotes, asides, and emphasis within flowing text
𝐁𝐨𝐥𝐝 𝐒𝐞𝐫𝐢𝐟 — slightly more formal, often used in thought leadership posts
𝙼𝚘𝚗𝚘𝚜𝚙𝚊𝚌𝚎 — used for code, data, or to create a distinct visual texture

Each has a different visual weight and personality. Bold sans-serif reads as confident and direct. Italic reads as reflective or emphatic. Monospace reads as technical or precise. Choosing the right style for your content adds a layer of communication beyond the words themselves.

How to Apply Bold Text to Your LinkedIn Posts

The simplest method is to use PostFont's LinkedIn text formatter. Type or paste your post into the editor, select the words you want to bold, and click the Bold button. The tool instantly converts your selection to the corresponding Unicode characters. Then copy the formatted post and paste it directly into LinkedIn's composer — the styling carries over perfectly.

The process takes about five seconds once you are familiar with it, and the result is a post that visually stands out in a feed full of plain text.

The Rules for Using Bold on LinkedIn

Bold text is a contrast tool — it only works when it is surrounded by plain text. If you bold everything, you bold nothing. Here are the rules that top LinkedIn creators follow:

Bold no more than one to three phrases per post
Use bold for your key insight, your surprising number, or your call to action
Never bold your entire hook line — let the first word or short phrase carry the emphasis
Avoid bolding common words like "the," "and," or "I" — save it for the words that deserve a second look

Accessibility Considerations

It is worth noting that Unicode bold characters can cause issues for screen readers, which may read them character by character or skip them entirely depending on the software and settings. For this reason, use Unicode formatting for emphasis only — never for the core message of your post. Your hook and key ideas should always be readable in plain text even if the formatting is stripped away.

With that caveat in mind, Unicode bold is one of the most effective and underused tools in the LinkedIn creator's toolkit. A single well-placed bold phrase can increase the visual hierarchy of a post and guide the reader's eye to exactly where you want it to land.