Bold Text Generator

How to use the bold text generator

How does a bold text generator work?

It swaps each plain letter for a different character that happens to look bold. Unicode, the standard that gives every character a number, includes a block of mathematical letters in bold, italic, script and other shapes. The generator finds the bold twin of each letter and prints it. No font is involved.

That block is called Mathematical Alphanumeric Symbols. It runs from U+1D400 to U+1D7FF, and the Unicode Standard, chapter 22 and the Unicode code chart for U+1D400 describe it. Because the letters are separate characters, they copy and paste like any other text. They are also separate from the letters on your keyboard, which causes every problem listed further down.

Worked example: how A becomes bold A

Plain capital A is U+0041. Its bold twin is U+1D400. The gap between them, 0x1D3BF (119,743 in decimal), is the same for every capital in the bold alphabet, so the generator only needs to add it.

Take H. It is U+0048, and 0x48 + 0x1D3BF = 0x1D407, which Unicode names MATHEMATICAL BOLD CAPITAL H. That number is above U+FFFF, so UTF-16 (the encoding browsers and most apps use for text) stores it as a pair of 16-bit units, 0xD835 and 0xDC07. One visible letter, two units. That detail decides how fast a character limit fills up.

Can I copy and paste bold text for Instagram, Facebook, LinkedIn and X?

Usually, yes. Social media apps see these characters as ordinary text, so they paste in. We have not checked each app's help pages for an official bold option, and the look depends on the app, phone and fonts. Paste one short test line into a draft first.

Bold text for Instagram bios and captions

A bold phrase suits the start of a bio or the first line of a caption, where it catches the eye. Keep hashtags, @mentions and links in plain letters. Styled letters are different characters from the ones on your keyboard, so an app may not recognize them as the same word.

Bold text for a Facebook post

For a Facebook post, style the one line you want read first and leave the rest plain. A whole post in bold is harder to read, and the styled letters take twice the room in a counter that counts UTF-16 units.

Bold text for LinkedIn

LinkedIn's help page for posts says "Posts can contain up to 3,000 characters" (read 2026-11-11). It does not say how it counts a letter above U+FFFF, so check the live counter in the composer after you paste. LinkedIn's help page does not describe a bold option either.

Bold text for X, TikTok and YouTube

On X and TikTok, short lines suit styled text, so bold a word or two and check the counter in the app. For YouTube comments, the next section covers the real bold syntax. If you are picking a look for an aesthetic bio or caption, script bold and Fraktur bold are decorative, while serif bold and sans bold stay easy to read.

Where should I use real bold instead of Unicode bold?

Use real bold wherever the app supports markup. WhatsApp bold is an asterisk on each side of the text, and Discord uses two. Real bold keeps your words as ordinary letters. The Markup tab in the tool writes the correct code for WhatsApp, YouTube comments, Discord and HTML, so you can paste it straight in.

WhatsApp bold text

WhatsApp's help page tells you to "place an asterisk on both sides of the text" (WhatsApp Help Center, read 2026-11-11). Type *your text* and it shows as bold in the chat. Unicode bold is not needed there.

Discord bold text

Discord documents bold as **bold** and bold italics as ***bold italics*** in its Markdown Text 101 article (read 2026-11-11). Underline, strikethrough and headers have their own markers in the same article.

YouTube comments and HTML

For comments, YouTube Help lists *bold text*, _italicized text_ and -strikethrough text- (the computer version of the page, read 2026-11-11). In HTML, the <b> element marks bold text, and the tool escapes any angle brackets or ampersands in your text so the result stays valid.

What can go wrong with bold Unicode text?

Four things, and you should know them before you publish. The characters can show as empty boxes where a font lacks them. An app can strip or replace them. A search for the plain word may not find the styled word. And anyone who copies your post copies the styled characters, not your original letters.

• Empty boxes. These characters sit above U+FFFF. A device or font without them draws a blank square. Pick another style, or use real bold.
• Cut characters. A limit that cuts a styled letter in half leaves a broken character at the end of the post. Leave a few units spare.
• Search mismatch. Styled and plain letters are different code points, so a page or app search for the plain word may not treat them as the same text. Keep your main keywords plain.
• Copy mismatch. Someone copying your bold line into a document gets the symbols. Sending a plain-text version alongside avoids the problem.

How do screen readers read bold Unicode text?

Often poorly. Unicode created these letters for mathematics, so a screen reader may spell them out by name, skip them or read something odd, depending on the reader, the voice and its settings. Accessibility write-ups report exactly that. We cannot promise how any one reader behaves.

The Unicode Standard says the block is intended for "mathematical or technical notation" and that these characters should not be used to represent styling of nonmathematical text (Unicode Standard, chapter 22, section 22.2.1). Scope for Business (October 25, 2021) says screen readers "may skip them entirely or read something irrelevant". Axbom's article (August 24, 2023) reports readers that skip the words or read a long description of each character.

What to do instead

Style a short phrase, never a whole post. Keep phone numbers, dates, prices, links and hashtags in plain letters. Where the app has real bold, use the Markup tab. Where it does not, start the line with a plain label such as "New:" and use short lines and spacing for emphasis. Read the sources: Scope for Business and Per Axbom.

Do numbers and punctuation turn bold too?

Digits do, with a catch. Serif bold, sans-serif bold and monospace each have their own digits. Bold italic, script bold and Fraktur bold have none, so the tool uses the serif bold digits for them, and sans-serif bold digits for sans-serif bold italic. Punctuation has no bold form and stays as typed.

Letters with accents, such as é or ñ, also pass through unchanged, because the bold block holds only the plain A to Z. Greek bold letters exist in the same block, but this tool does not convert them.

Is there bold text for Bangla, Hindi or Arabic?

Not as Unicode bold letters. The bold block covers Latin letters, Greek letters and digits only, so there is no bold alphabet for Bengali (Bangla), Devanagari (the script Hindi uses) or Arabic. This tool leaves those scripts unchanged and does not fake it.

We checked the Unicode character names for the block. Arabic does have a separate set of mathematical letters (starting at U+1EE00), but it is for mathematics and has no bold form. For Bangla, Hindi or Arabic text, bold is a font weight or a formatting command in the app, such as a bold button in a word processor.

Can I make bold text blue?

No, whether you spell it color or colour. Unicode bold characters carry a shape, not a color. The color comes from the app, page or document that displays them. If an app has its own text color setting, use that. HTML and CSS use the color property.

Can I bold only some words, and can I undo it?

Yes to both. Tick "Only style the text I select" and highlight the words in the box. The rest stays plain in every row. The Unbold row turns styled letters and digits from any of the 13 math alphabets back to plain A to Z, a to z and 0 to 9. Letterlike symbols such as ℎ and ℬ are converted too.

Why does bold text use up my character limit faster?

Because most apps count UTF-16 units, and each bold letter takes two. The counter in the tool shows both numbers for every style: code points (what you see as characters) and UTF-16 units. If an app counts the second way, a 100-letter bold line uses 200.

Apps differ on which count they apply, and most do not say. LinkedIn's help page gives a figure of 3,000 characters without naming the unit. We list that one limit because it is the one we could read on a platform's own help page. Check the counter in the app you use.

Is the tool the same in the US, UK, Australia and Canada?

Yes. The tool, the characters and this wording are identical in all four. Our autocomplete check on 2026-11-11 showed small differences in what people add: the US adds YouTube, Discord and tool, the UK adds aesthetic and X, and Australia and Canada add TikTok. More text tools are in the Text tools hub, and the Word Counter counts words and characters in plain text.