Split Test Email Subject Lines in HighLevel

Did You Know You Can Split Test Email Subject Lines in HighLevel?

November 24, 20251 min read

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Split test your email subject lines for better results in HighLevel

Getting your emails opened often depends on just a few words: your subject line. With HighLevel’s built-in email subject line split testing, you don’t have to guess which subject line performs better. You can test, track and automatically send the winning version to the rest of your list.

Why subject line A/B testing in HighLevel matters

HighLevel’s A/B testing feature for email campaigns lets you compare two subject line variations and see which one your audience responds to best. It’s one of the easiest and fastest ways to boost your open rates without changing your entire email strategy.

How to set up email subject line split testing in HighLevel

Getting started is simple:

1️⃣ Go to Marketing > Emails inside your HighLevel sub-account
2️⃣ Click Create Campaign and choose your email template
3️⃣ Inside the editor, toggle on A/B testing in the top left corner
4️⃣ Select “Subject Line” as the test type
5️⃣ Set your test duration (default is 8 hours) and input two subject lines
6️⃣ Adjust the audience percentage split using the slider

HighLevel will send the subject line variations to two test groups, then send the winning one to the rest of your list - all automatically.

What happens after you send the campaign

Once your test runs:

  • HighLevel analyzes which subject line had more opens or clicks

  • It sends the winning version to the remaining contacts

  • You can review performance metrics in your campaign report

No more guessing, just real data driving better results

Login or start a free trial today to try it for yourself!


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