What Is an Underline Text Generator?

Quick answer: an underline text generator places a line beneath text by adding the combining character U+0332 (low line) after each letter, or U+0333 for a double line. The line becomes part of the characters, so it shows up in Instagram, X, LinkedIn, Facebook, and other places that offer no underline button.

Before bold and italic fonts were easy to produce, typists underlined to stress a word or mark a book title. On the web, underlines came to mean links, so most social apps quietly dropped them. Combining marks bring them back as plain characters that any app will display.

Beyond more than forty ready styles, from dotted and wavy lines to overlines and bold underlined letters, the page has three practical tools. One tool lets you choose individual words for a line beneath them. A heading rule maker writes plain-text headings with ═══ or — lines for emails, notes, README files and code comments, including Markdown’s own setext syntax. A CSS builder writes modern text-decoration code with colour, thickness, offset, skip-ink and hover effects for your website.

• 14 Combining line marks used
• 9 Heading rule characters
• 6 CSS line styles

How Do You Underline Text Without a Button?

1. Type the words: A heading, a deadline, a name, or a single key term.
2. Pick a line: Single, double, dotted, wavy, overline, or a styled-letter version.
3. Be selective: Use the word picker to underline only what matters.
4. Copy and paste: The line travels with the text into any app.

Which Apps Support Underlining?

App or program	Built-in underline	Unicode underline
Discord	__text__	Works, also in nicknames
Microsoft Word, Google Docs, Gmail	Ctrl + U (Cmd + U on Mac)	Works
WhatsApp, Telegram, Slack	No underline in messages	Works
Instagram, TikTok, X, Facebook, LinkedIn	None	The only way
Websites	CSS text-decoration	Avoid; use CSS instead

Discord users can mix __underline__ with other Discord fonts and formatting such as spoilers and code.

When Is Underlined Text a Good Idea?

• Deadlines and conditions: the date or rule a reader must not miss.
• Forms and worksheets: Name: ________ blanks for printing or filling in.
• Plain-text headings: emails, notes, and README files without rich formatting.
• Profile highlights: one underlined role or offer in a bio.
• Language learning: marking the stressed syllable or the new word.
• Legal and academic drafts: showing inserted wording next to struck deletions.

Modern style guides italicize book titles rather than underlining them, so use our page to italicize book titles in posts.

Underline Vocabulary

Low line

U+0332, the combining mark for a single underline under the previous letter.

Double low line

U+0333, two parallel lines beneath a letter.

Descender

The part of g, j, p, q, and y that drops below the baseline.

Skip-ink

A CSS behaviour that breaks the underline around descenders for readability.

Underline offset

The gap between the baseline and the line, set with text-underline-offset.

Setext heading

A Markdown heading underlined with === for level one or — for level two.

Underline Tools on This Page

Word picker

Underline only the words you tap.

Heading rules

Nine rule characters, numbering and spacing.

Heading rules line up perfectly when the email or file uses monospace text, which our monospace page explains.

CSS builder

Colour, thickness, offset, hover and marker.

Line variety

Dotted, wavy, equals, breve and ring lines.

Overlines

Single, double and over-plus-under.

Line remover

Strip marks from pasted text.

Need a line through the words instead of under them? Our strikethrough text generator also compares two drafts for you.

Building a website?

Get clean CSS for coloured, offset or wavy underlines.

{ } Open the CSS Builder

Why Does My Underline Look Broken?

Problem	Cause	Fix
Gaps between words	Spaces are not underlined by default	Use Continuous Underline
Tiny gaps between letters	The font draws each mark separately	Try Short Low Bar or the double version
Line cuts through g and y	Combining marks cannot skip descenders	Accept it, or use CSS skip-ink on websites
Discord shows italics instead	Single underscores mean italics	Use two underscores on each side
Wavy line looks like dots	Some fonts render the tilde-below mark small	Switch to the Wavy Rule heading style

Tips for Underlining Well

Underline the fact, not the sentence

A date, a price, or a single rule stands out best on its own.

Do not fake links

On web pages, underlined words that are not links frustrate visitors.

For emphasis that does not look like a link, the bold italic text generator gives the strongest weight and slant.

Combine sparingly

Bold plus underline plus capitals is shouting; pick two at most.

Rules for structure

Heading rules make long plain-text emails scannable.

Underline Text FAQ

What is underlined text?

Text with a line drawn beneath it, traditionally used for emphasis and titles, and on the web for links.

How does the underline generator work?

It inserts U+0332, a combining low line, after every letter, so the line is drawn under each character in any app.

How do I underline text on Instagram?

The app lacks a U button, so a Single Underline card copied here is the workaround for bios and captions.

How do I underline in Discord?

Put two underscores on each side, like __this__. Add asterisks inside for bold underline: __**this**__.

Can I underline on WhatsApp?

WhatsApp has no underline formatting, but the Unicode underline styles paste into chats normally.

What is the keyboard shortcut to underline?

Ctrl + U in Word, Google Docs, Gmail, and most editors, or Cmd + U on a Mac.

How do I make a double underline?

Copy the Double Underline style, which uses U+0333. In Word, open the Font dialog and choose the double line style.

Why are there gaps between the underlined words?

Spaces are left unmarked so words stay distinct. Choose Continuous Underline for one unbroken line.

Can I underline only one word?

Yes. Tap that word in the word picker, or use First Word, Last Word, or Keywords Underlined.

What is an overline?

A line drawn above letters, made here with U+0305. It is used in mathematics for averages and repeating decimals.

How do I make a wavy underline?

Use the Wavy Underline card for text, or set text-decoration-style to wavy in the CSS builder.

How do I underline a heading in a plain-text email?

Use the heading rule maker. It writes the heading and a matching line of ═, -, or another character underneath.

What is a setext heading?

A Markdown heading underlined with equals signs for a title or hyphens for a subtitle.

How do I change underline colour and thickness with CSS?

Use text-decoration-color and text-decoration-thickness; the CSS builder writes both for you.

What does text-underline-offset do?

It moves the underline further from the letters, which looks cleaner with descenders.

Should I underline text on my website?

Only for links. Use bold or a highlight for emphasis so visitors are not confused.

How do I remove underline marks from text?

Paste it into the word picker’s sentence box and press Remove lines from the sentence.

Do underlined letters count as extra characters?

Yes. Each letter gains one invisible mark, so the text is roughly twice as long to a counter.

Will screen readers read underlined Unicode text?

They read the letters normally and usually ignore the marks, so the meaning stays clear.

Is my underlined text stored online?

No. Underlines, heading rules, and stylesheets are all calculated in this tab and remain private.

Is the underline tool free?

Yes, all forty-plus styles and the three tools cost nothing and need no registration.

Every underline works on top of our copy and paste fonts, so you can underline script, bold or gothic letters too.

Underline Any Text, Anywhere

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Unicode underlines, heading rules, and CSS in one place. U̲ Start Underlining