Email Subject Lines: 63 Best Practices, Tips, and Examples

The importance of Email subject line

An email subject line is the text that appears in the subject field of an email, providing a preview of the content or purpose of the email. It’s the first thing recipients see when they receive an email in their inbox, and it often plays a crucial role in whether or not the email gets opened.

First Impression: The subject line is the first impression a recipient has of your email. A well-crafted subject line can entice recipients to open the email, while a poor one may cause them to ignore or delete it.

Sets Expectations: It helps set the expectation for what the email contains, whether it’s a promotional offer, an update, or information like a newsletter or event reminder.

Influences Open Rates: A compelling subject line can significantly improve open rates, which is a key metric for evaluating the success of email marketing campaigns.

Best Practices for Email Subject Lines

Keep It Short and Concise:

  • Aim for 5-9 words or 30-60 characters to ensure the subject line fits well on both desktop and mobile screens.
  • Shorter subject lines tend to have higher open rates as they quickly convey the message.
  • Example: “Exclusive Deal: 20% Off Today”

Personalize When Possible:

  • Adding the recipient’s name or location can make the email feel more personal and increase the chance of it being opened.
  • Dynamic fields can be used to insert personalized elements.
  • Example: “Hey [Name], Your Weekly Fashion Picks Are Here!”

Use Action-Oriented Language:

  • Use verbs to create a sense of urgency or encourage the recipient to take a specific action.
  • This makes it clear what you want the reader to do.
  • Example: “Claim Your Free Ebook Now!”

Create Urgency and FOMO (Fear of Missing Out):

  • Adding time-sensitive language can encourage recipients to act quickly.
  • Words like “Today Only,” “Last Chance,” or “Ends Tomorrow” can boost open rates.
  • Example: “Flash Sale: 50% Off Ends Tonight!”

Be Clear About the Content:

  • Let recipients know what to expect when they open the email.
  • Avoid being too vague or misleading, as this can result in high unsubscribe rates.
  • Example: “Your Monthly Report Is Ready for Download”

Use Numbers and Lists:

  • Including numbers can make the subject line more structured and attractive.
  • List-based subject lines often perform well because they promise clear, digestible content.
  • Example: “Top 5 Tips for Better Sleep”

Test with A/B Testing:

  • Experiment with different subject lines using A/B testing to see which version resonates more with your audience.
  • Focus on variations in tone, length, personalization, and urgency.
  • Example: Test “Don’t Miss Out: Sale Ends Soon” vs. “Save Big Today Only”

Avoid Spammy Words:

  • Words like “Free,” “Cash,” “Urgent,” and “Win” can trigger spam filters, especially if used excessively.
  • Avoid using too many exclamation marks or ALL CAPS, as these can also be flagged.
  • Example: Instead of “Free Gift Inside!!!” use “Your Special Gift Awaits”

Ask a Question:

  • Asking questions can pique curiosity and make the reader more inclined to open the email to find the answer.
  • Example: “Struggling to Stay Focused? Try This”

Use Emojis Wisely:

Example: “Ready for 🌞 Summer Deals?”.

Tips for Effective Email Subject Lines

Know Your Audience: Understand what kind of language and tone resonates with your target audience. A casual subject line might work for a fashion brand, but a more formal tone might be better for financial services.

Make It Intriguing, Not Misleading: Creating curiosity is good, but avoid misleading your readers. A misleading subject line might lead to a high open rate initially but could damage trust over time.

Use Preheader Text Wisely: The preheader text, or the text that appears next to the subject line in many email clients, can complement your subject line and provide extra context.

Segment Your List: Customize subject lines based on different segments of your email list (e.g., new subscribers, loyal customers, cart abandoners). This makes the message more relevant.

Focus on Benefits, Not Just Features: Highlight the value or benefit that the reader will receive rather than just describing a feature.

Example: Instead of “New Features in Our App,” use “Get More Done with Our App’s New Features!”.

Examples of Effective Email Subject Lines


  1. Promotional:
    • “Your 50% Off Coupon Expires Today!”
    • “Buy One, Get One Free—Limited Time Offer”
    • “Summer Sale: Up to 70% Off”
  2. Welcome Emails:
    • “Welcome to [Company]! Here’s What You Need to Know”
    • “Glad You’re Here! Get Started with Your Free Guide”
    • “Your Exclusive Member Benefits Inside”
  3. Engagement and Re-engagement:
    • “We Miss You! Here’s 20% Off to Come Back”
    • “It’s Been a While—See What’s New!”
    • “Still Interested? Your Cart Awaits”
  4. Content or Educational Emails:
    • “10 Ways to Improve Your Productivity”
    • “The Ultimate Guide to Email Marketing”
    • “Webinar Reminder: How to Grow Your Business Online”
  5. Curiosity-Driven:
    • “You Won’t Believe What’s Inside…”
    • “This Change Will Save You Time—Find Out How”
    • “Guess What’s Back in Stock?”
  6. Seasonal or Holiday:
    • “Get Ready for the Holidays with Our Gift Guide 🎁”
    • “Spooky Savings: 31% Off for Halloween”
    • “New Year, New Deals—Start 2024 Right”

By following these best practices, using attention-grabbing language, and aligning your subject lines with the needs of your audience, you can significantly improve your email open rates and drive more engagement with your campaigns.