> ## Documentation Index
> Fetch the complete documentation index at: https://resources.latex-cloud-studio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# LaTeX Bold Text: \textbf{}, Italics, Underline, and \emph{}

> Use `\textbf{}` for bold text in LaTeX. This guide also shows `\textit{}`, `\underline{}`, and `\emph{}` with copy-paste examples.

To make text bold in LaTeX, use `\textbf{}` in text mode: `\textbf{bold text}`. If you also need italics, underline, or semantic emphasis, use `\textit{}`, `\underline{}`, or `\emph{}` depending on the job. This guide starts with the exact bold-text syntax, then shows when the other commands are a better fit.

<Info>
  **Quick reference**: `\textbf{bold}`, `\textit{italic}`, `\underline{underline}`

  **Most common use case**: If you searched for "LaTeX bold text", the command you need is `\textbf{}`.
</Info>

## Basic Text Formatting

### Bold Text

Use `\textbf{}` to make text bold:

<Tabs>
  <Tab title="Code">
    <CodeGroup>
      ```latex bold.tex theme={null}
      \documentclass{article}
      \begin{document}

      This is \textbf{bold text} in a sentence.

      \textbf{This entire sentence is bold.}

      You can \textbf{nest other commands like \textit{italic} inside bold}.

      \end{document}
      ```
    </CodeGroup>
  </Tab>

  <Tab title="Rendered output">
    <div className="latex-preview-shell">
      <div className="latex-preview-paper latex-preview-paper--narrow">
        <p className="latex-preview-paragraph">
          This is <strong>bold text</strong> in a sentence.
        </p>

        <p className="latex-preview-paragraph">
          <strong>This entire sentence is bold.</strong>
        </p>

        <p className="latex-preview-paragraph">
          You can <strong>nest other commands like <em>italic</em> inside bold</strong>.
        </p>
      </div>
    </div>
  </Tab>
</Tabs>

### Italic Text

Use `\textit{}` for italics:

<Tabs>
  <Tab title="Code">
    <CodeGroup>
      ```latex italic.tex theme={null}
      \documentclass{article}
      \begin{document}

      This is \textit{italic text} in a sentence.

      \textit{This entire sentence is italicized.}

      LaTeX uses \textit{emphasis} for semantic meaning.

      \end{document}
      ```
    </CodeGroup>
  </Tab>

  <Tab title="Rendered output">
    <div className="latex-preview-shell">
      <div className="latex-preview-paper latex-preview-paper--narrow">
        <p className="latex-preview-paragraph">
          This is <em>italic text</em> in a sentence.
        </p>

        <p className="latex-preview-paragraph">
          <em>This entire sentence is italicized.</em>
        </p>

        <p className="latex-preview-paragraph">
          LaTeX uses <em>emphasis</em> for semantic meaning.
        </p>
      </div>
    </div>
  </Tab>
</Tabs>

### Underlined Text

Use `\underline{}` for underlining:

<CodeGroup>
  ```latex underline.tex theme={null}
  \documentclass{article}
  \begin{document}

  This is \underline{underlined text} in a sentence.

  \underline{This entire sentence is underlined.}

  % Note: Underlining can look messy with descenders
  The letters \underline{g, j, p, q, y} have descenders.

  \end{document}
  ```
</CodeGroup>

<Warning>
  **Avoid overusing underline**: In professional typography, underlining is rarely used. Consider bold or italic for emphasis instead.
</Warning>

## Combining Formats

You can combine multiple formatting commands:

<CodeGroup>
  ```latex combining.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Bold and italic
  \textbf{\textit{Bold and italic text}}

  % Italic and underlined
  \textit{\underline{Italic and underlined}}

  % All three
  \textbf{\textit{\underline{Bold, italic, and underlined}}}

  % Alternative nesting order (same result)
  \underline{\textbf{\textit{Also all three formats}}}

  \end{document}
  ```
</CodeGroup>

## Emphasis Command

The `\emph{}` command provides semantic emphasis:

<Tabs>
  <Tab title="Code">
    <CodeGroup>
      ```latex emphasis.tex theme={null}
      \documentclass{article}
      \begin{document}

      % Normal emphasis (produces italic)
      This is \emph{emphasized text}.

      % Nested emphasis (toggles back to normal)
      \emph{This is italic with \emph{nested} emphasis.}

      % Emphasis is semantic - it adapts to context
      \textit{In italic text, \emph{emphasis} becomes upright.}

      \end{document}
      ```
    </CodeGroup>
  </Tab>

  <Tab title="Rendered output">
    <div className="latex-preview-shell">
      <div className="latex-preview-paper latex-preview-paper--narrow">
        <p className="latex-preview-paragraph">
          This is <em>emphasized text</em>.
        </p>

        <p className="latex-preview-paragraph">
          <em>
            This is italic with <span style={{ fontStyle: "normal" }}>nested</span> emphasis.
          </em>
        </p>

        <p className="latex-preview-paragraph">
          <em>
            In italic text, <span style={{ fontStyle: "normal" }}>emphasis</span> becomes upright.
          </em>
        </p>
      </div>
    </div>
  </Tab>
</Tabs>

<Tip>
  Use `\emph{}` when you want to emphasize meaning. Use `\textit{}` when you specifically want italic style.
</Tip>

## Additional Text Styles

### Small Caps

<CodeGroup>
  ```latex smallcaps.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Small capitals
  \textsc{Small Capitals Look Like This}

  % Useful for names and acronyms
  \textsc{nasa} announced the launch.

  Written by \textsc{John Smith}, \textsc{phd}.

  \end{document}
  ```
</CodeGroup>

### Typewriter (Monospace)

<CodeGroup>
  ```latex typewriter.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Monospace font for code
  Type \texttt{latex document.tex} to compile.

  % File paths
  Save your file as \texttt{/home/user/document.tex}

  % Inline code
  The \texttt{\\textbf} command makes text bold.

  \end{document}
  ```
</CodeGroup>

### Sans Serif

<CodeGroup>
  ```latex sans-serif.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Sans serif text
  \textsf{This is sans serif text.}

  % Useful for modern look
  \textsf{\textbf{Bold Sans Serif Heading}}

  \end{document}
  ```
</CodeGroup>

### Slanted Text

<CodeGroup>
  ```latex slanted.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Slanted is different from italic
  \textsl{This is slanted text.}

  Compare: \textit{italic} vs \textsl{slanted}

  \end{document}
  ```
</CodeGroup>

## Font Size Commands

Combine with text formatting:

<CodeGroup>
  ```latex sizes.tex theme={null}
  \documentclass{article}
  \begin{document}

  {\large \textbf{Large Bold Text}}

  {\Large \textit{Even Larger Italic}}

  {\small \texttt{Small monospace text}}

  % Size commands from smallest to largest:
  {\tiny tiny}
  {\scriptsize scriptsize}
  {\footnotesize footnotesize}
  {\small small}
  {\normalsize normalsize}
  {\large large}
  {\Large Large}
  {\LARGE LARGE}
  {\huge huge}
  {\Huge Huge}

  \end{document}
  ```
</CodeGroup>

## Color Text (Optional Package)

Add color to your formatting:

<CodeGroup>
  ```latex color.tex theme={null}
  \documentclass{article}
  \usepackage{xcolor}
  \begin{document}

  % Basic colors
  \textcolor{red}{Red text}
  \textcolor{blue}{\textbf{Bold blue text}}
  \textcolor{green}{\textit{Italic green text}}

  % Custom colors
  \definecolor{myorange}{RGB}{255, 96, 55}
  \textcolor{myorange}{Custom orange color}

  % Highlighting
  \colorbox{yellow}{Highlighted text}

  \end{document}
  ```
</CodeGroup>

## Advanced Formatting

### Strikethrough

<CodeGroup>
  ```latex strikethrough.tex theme={null}
  \documentclass{article}
  \usepackage{soul}
  \begin{document}

  % Strikethrough
  \st{This text is struck through}

  % Highlighting with soul package
  \hl{This text is highlighted}

  % Letter spacing
  \so{SPACED OUT TEXT}

  \end{document}
  ```
</CodeGroup>

### Better Underlines

<CodeGroup>
  ```latex better-underline.tex theme={null}
  \documentclass{article}
  \usepackage{ulem}
  \begin{document}

  % Normal underline
  \uline{Better underline with ulem}

  % Double underline
  \uuline{Double underlined text}

  % Wavy underline
  \uwave{Wavy underline for errors}

  % Strike out
  \sout{Struck out text}

  \end{document}
  ```
</CodeGroup>

## Environment-Based Formatting

For longer passages:

<CodeGroup>
  ```latex environments.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Bold environment
  \begin{bfseries}
  This entire paragraph is bold. You can write multiple sentences
  and they will all be bold. This is useful for longer passages.
  \end{bfseries}

  % Italic environment
  \begin{itshape}
  This entire paragraph is in italics. Every sentence here
  will be italicized until we close the environment.
  \end{itshape}

  % Typewriter environment
  \begin{ttfamily}
  This looks like computer code.
  All text here is monospaced.
  \end{ttfamily}

  \end{document}
  ```
</CodeGroup>

## Declaration Commands

Alternative syntax using declarations:

<CodeGroup>
  ```latex declarations.tex theme={null}
  \documentclass{article}
  \begin{document}

  % Declarations affect all following text
  {\bfseries Bold text using declaration}

  {\itshape Italic text using declaration}

  {\bfseries\itshape Bold and italic together}

  % Limiting scope with braces
  Normal text {\sffamily sans serif text} normal again

  \end{document}
  ```
</CodeGroup>

## Common Use Cases

### Document Structure

<CodeGroup>
  ```latex structure.tex theme={null}
  \documentclass{article}
  \begin{document}

  \textbf{\large 1. Introduction}

  This section introduces the topic with \emph{emphasis} on key concepts.

  \textbf{Key Terms:}
  \begin{itemize}
  \item \textbf{LaTeX:} A typesetting system
  \item \textbf{Markup:} Text with formatting codes
  \item \textbf{Compiler:} Processes \texttt{.tex} files
  \end{itemize}

  \end{document}
  ```
</CodeGroup>

### Academic Writing

<CodeGroup>
  ```latex academic.tex theme={null}
  \documentclass{article}
  \begin{document}

  According to \textit{Smith et al.} (2023), the results were 
  \textbf{statistically significant} (p < 0.05).

  \emph{Note:} These findings contradict earlier work by 
  \textsc{Johnson} (2020).

  \end{document}
  ```
</CodeGroup>

## Best Practices

<Tip>
  **Formatting guidelines:**

  1. **Use sparingly** - Too much formatting reduces impact
  2. **Be consistent** - Use the same style for similar elements
  3. **Semantic meaning** - Use `\emph` for emphasis, not just italics
  4. **Avoid underlines** - Use bold or italic instead
  5. **Consider readers** - Some formats don't work well in all media
</Tip>

## Common Mistakes

<Warning>
  **Avoid these errors:**

  1. **Over-formatting** - Don't combine too many styles
  2. **Underline with descenders** - Looks messy with g, j, p, q, y
  3. **All caps** - Use `\textsc{}` for small caps instead
  4. **Forgetting braces** - `\textbf{text}` not `\textbf text`
  5. **Wrong nesting** - Close commands in reverse order
</Warning>

## Quick Reference Table

| Command            | Output      | Usage      |
| ------------------ | ----------- | ---------- |
| `\textbf{text}`    | **text**    | Bold       |
| `\textit{text}`    | *text*      | Italic     |
| `\underline{text}` | <u>text</u> | Underline  |
| `\emph{text}`      | *text*      | Emphasis   |
| `\textsc{text}`    | TEXT        | Small caps |
| `\texttt{text}`    | `text`      | Monospace  |
| `\textsf{text}`    | text        | Sans serif |
| `\textsl{text}`    | *text*      | Slanted    |

## Troubleshooting

### Text Not Formatting

Check for:

* Missing braces: `\textbf{text}` not `\textbf text`
* Typos in commands
* Missing packages for special formatting

### Nested Commands Not Working

Ensure proper nesting:

```latex theme={null}
% Correct
\textbf{\textit{text}}

% Incorrect
\textbf{\textit{text}}
```

***

<Info>
  **Next**: Learn how to create [Lists](/learn/latex/basics/lists) for organizing information effectively, or explore [Advanced text formatting](/learn/latex/text-formatting) for more sophisticated typography options.
</Info>