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AI subject line generator

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MailerLite’s AI subject line generator can help generate effective and targeted subject lines in seconds, promoting higher open rates and conversions.

AI can help to ensure your subject lines are relevant and timely, based on factors like trending topics, recipient's location, or time of the day.

  1. Navigate to the Campaigns page.

  2. Click Create campaign.

  3. Choose a campaign type. AI subject line generation is available for all campaign types.

4. Choose to Start from scratch or with a Template.

5. If you choose to Start from scratch, select your Editor type.

6. You will land in the campaign editor of your choice. When you are finished designing your campaign, click Done editing.

Need a helping hand with your newsletter copy? Learn how to use the AI writing assistant to use the power of AI to write a professional newsletter in minutes!

Next you'll find the Campaign details page. Click into the Subject field to edit the subject line and see the AI suggestions area.

⬅️ 1/4 ➡️ Use the arrows to toggle between the first four suggestions. 

☑️ Click the check mark to insert the text into the subject line field.

🔄 Use the regenerate button to receive a new set of AI suggestions.

Here, you can add more details to the prompt in order to get more specific results and click Regenerate

Click Insert to add the Subject line text into the field.

To reopen the Subject line generator, click the green star symbol ✨ to the right of the Subject field.

From there, you can also add personalization and emojis to complete your subject line.

That’s it! Now you’re ready to send or schedule your campaign.

Last time edited: Mar 12, 2026