Precision in punctuation is the hallmark of professional writing. While most users default to the standard hyphen found on their keyboard, the "long dash"—properly known as the em dash (—)—is an essential tool for creating sophisticated sentence structures, indicating an abrupt change in thought, or replacing parentheses and colons for dramatic effect.

If you are looking for the immediate answer, the fastest way to type a long dash in Microsoft Word on Windows is to type two hyphens between two words (like word--word) and press Space. On a Mac, the system-wide shortcut is Option + Shift + Hyphen.

However, Microsoft Word’s behavior can vary depending on your version, your keyboard hardware, and your internal settings. This comprehensive guide explores every method to master the em dash, ensuring your documents maintain the highest editorial standards.

Understanding the Hierarchy of Dashes

Before diving into the "how," it is vital to understand "what" you are inserting. Using the wrong dash is a common mistake that can signal a lack of attention to detail to editors and professional clients.

1. The Hyphen (-)

The shortest mark, found directly next to the "0" key. Its primary purpose is to join compound words (e.g., "long-term") or to separate phone number digits. In professional typography, a hyphen should never be used to indicate a break in a sentence.

2. The En Dash (–)

Slightly longer than a hyphen (roughly the width of the letter 'n'). It is primarily used to denote ranges of time, pages, or dates (e.g., "1990–2000"). In Microsoft Word, you can typically create this by typing a word, a space, two hyphens, another space, and a word.

3. The Em Dash (—)

The "long dash" this guide focuses on. It is approximately the width of the letter 'm'. It provides a visual break that is stronger than a comma but less formal than a colon. It is the gold standard for creative and academic prose.

The Most Efficient Method: Automatic Formatting

Microsoft Word includes a powerful engine called AutoFormat As You Type. This feature is designed to anticipate your needs and convert basic keystrokes into professional symbols.

How the Two-Hyphen Trick Works

For most users, the em dash is created naturally during the flow of typing:

  1. Type a word.
  2. Immediately type two hyphens (--) with no spaces before them.
  3. Type the next word immediately after the hyphens.
  4. Press the Spacebar or any punctuation mark (like a period or comma).

Word will instantly merge the two short hyphens into one continuous long dash.

Pro Tip from the Editor’s Desk: In our testing, we have found that if you leave a space before the two hyphens, Word often assumes you want an en dash (the medium-length one) instead of an em dash. To ensure a long dash, keep the hyphens "glued" to the words on either side until the conversion triggers.

Windows Keyboard Shortcuts: Power User Secrets

If the automatic conversion isn't working or if you prefer manual control, Windows offers two primary hardware-based shortcuts.

1. The Numeric Keypad Method (Alt Codes)

This is the most reliable method across all versions of Windows. It utilizes ASCII/Unicode values.

  • The Shortcut: Hold down the Alt key and type 0151 on your numeric keypad.
  • Requirement: This only works if your keyboard has a dedicated number pad on the right side. Typing the numbers on the top row of your keyboard will not trigger the symbol.

2. The Ctrl + Alt + Minus Shortcut

Word has a built-in shortcut specifically mapped for the em dash:

  • The Shortcut: Press Ctrl + Alt + Minus Sign (-) simultaneously.
  • Note: The "Minus Sign" refers to the one on the numeric keypad. If you are using a laptop without a Numpad, this shortcut may require the "Fn" key or may not work at all without remapping.

How to Make a Long Dash on Mac

Apple’s macOS handles special characters differently than Windows, often making them more accessible through the "Option" modifier key.

The Standard Mac Shortcut

In any version of Word for Mac (including Microsoft 365):

  • The Shortcut: Press Option + Shift + Hyphen.

This is a system-wide command, meaning it works not just in Word, but also in Pages, Mail, and your web browser. It is widely considered the most ergonomic way to type an em dash.

Using the Symbol Menu for Precision

If you find shortcuts difficult to remember, or if you are working on a tablet or a device without a standard keyboard, the Ribbon interface provides a visual way to select the em dash.

Step-by-Step UI Navigation

  1. Open your document and place the cursor where the dash belongs.
  2. Click the Insert tab on the top Ribbon.
  3. On the far right, click Symbol.
  4. Select More Symbols... at the bottom of the dropdown.
  5. In the window that appears, click the Special Characters tab.
  6. The very first item on the list is usually the Em Dash.
  7. Click Insert, then Close.

This method is particularly useful because it also shows you the keyboard shortcut assigned to the character at the bottom of the window, serving as a helpful reminder for future use.

Customizing Your Own Shortcut

For writers who use the long dash frequently but find the default shortcuts (like Alt+0151) cumbersome, Microsoft Word allows you to "rebind" the em dash to any key combination you prefer.

How to Assign a Custom Key

  1. Follow the steps above to reach the Special Characters tab in the Symbol menu.
  2. Highlight the Em Dash.
  3. Click the Shortcut Key... button at the bottom.
  4. In the "Press new shortcut key" field, type your preferred combination. We recommend something like Alt + D (for Dash) or Ctrl + Shift + M.
  5. Click Assign, then Close.

From that moment forward, Word will recognize your custom command, drastically speeding up your drafting process.

Troubleshooting: Why the Long Dash Won't Appear

It can be frustrating when you type two hyphens and nothing happens. This usually points to a settings issue within Word’s proofing engine.

Fixing AutoCorrect Settings

If the automatic conversion has stopped working, follow these steps to re-enable it:

  1. Go to File > Options (or Word > Preferences on Mac).
  2. Select Proofing.
  3. Click on AutoCorrect Options....
  4. Navigate to the AutoFormat As You Type tab.
  5. Under the "Replace as you type" section, ensure the box for "Hyphens (--) with dash (—)" is checked.
  6. Click OK.

The "Undo" Conflict

Sometimes, Word converts the dash, and then the user accidentally "undoes" it. If you press Ctrl + Z immediately after Word creates a long dash, it will revert back to the two hyphens. Be mindful of your "Undo" history if you are editing rapidly.

Styling the Em Dash: To Space or Not to Space?

Once you know how to make the dash, the next question is how to style it. This is a matter of fierce debate among grammarians.

The Standard Rule (The Chicago Manual of Style)

The most common academic and literary standard is to use the em dash without spaces on either side—like this. It creates a tight, cohesive look that keeps the flow of the sentence intact.

The Journalistic Rule (AP Style)

The Associated Press (AP) style, used by most newspapers, recommends placing a space on both sides of the em dash — like this. This is often done to improve readability in narrow newspaper columns where text can become crowded.

Our Recommendation: Consistency is more important than the specific rule you choose. If you decide to use spaces, use them for every em dash in the document.

Long Dashes in Word for the Web and Mobile

If you are using the browser-based version of Microsoft Word, some "Alt" codes may not work because the browser intercepts the commands.

  • Word for the Web: The two-hyphen (--) auto-conversion still works perfectly. If that fails, right-click and see if "Insert Symbol" is available, or use your operating system's built-in emoji/symbol picker (Windows Key + Period on PC; Cmd + Ctrl + Space on Mac).
  • Word for iOS/Android: On mobile keyboards, long-press the Hyphen (-) key. A small pop-up will appear, allowing you to slide your finger to the em dash (the longest line) or the en dash.

Summary

Mastering the long dash in Microsoft Word is a simple upgrade that yields professional results. Whether you rely on the seamless AutoFormat method, the precision of Alt codes, or the flexibility of custom shortcuts, having this tool at your fingertips allows you to write with more clarity and impact.

Key Takeaways

  • Fastest Way: Type -- between words and hit space.
  • Windows Shortcut: Ctrl + Alt + Minus (Numeric Keypad).
  • Mac Shortcut: Option + Shift + Hyphen.
  • Manual Method: Insert > Symbol > Special Characters.
  • Pro Tip: Ensure "Hyphens with dash" is enabled in your AutoCorrect settings to keep the process automatic.

FAQ

What is the difference between a long dash and a hyphen? A hyphen joins words (short-term), while a long dash (em dash) separates parts of a sentence or indicates a pause. The em dash is significantly longer than the hyphen.

How do I make a long dash on a laptop without a number pad? The best way is to use the two-hyphen auto-conversion (--) or to use the "Insert Symbol" menu to assign a custom shortcut that doesn't require a numeric keypad, such as Alt + D.

Can I use the em dash instead of a colon? Yes. An em dash can often replace a colon to introduce a list or a conclusion, adding a more emphatic or less formal tone to the writing.

Does the long dash work in Google Docs too? Yes, Google Docs also uses the two-hyphen auto-conversion, though its internal shortcut menus differ from Microsoft Word.

Why does my em dash look like two separate lines? This is usually a font-specific issue. Some monospaced fonts (like Courier) may display the em dash with a tiny gap in the middle. Switching to a standard font like Calibri, Arial, or Times New Roman will usually result in a solid, continuous line.