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Email subject line generator

Goodbye, writer’s block. Preview how brands use Klaviyo’s built-in AI email subject line generator to spin up punchy, open-worthy subject lines that align to their email goals.

To experience the real deal with your own prompts, create a free Klaviyo account.

Generate email subject lines

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Email subject line best practices

Keep it concise and punchy

The subject line’s job is to grab attention, not convey the entirety of the email’s content. Focus on one core message, without filler words or excessive detail.

Make it personal (actually personal)

Including the customer’s first name is fine, but what really resonates is content that’s specific to their activity or preferences—both known and predicted.

Always be testing what works for who

Urgency, curiosity, humor, emojis—A/B test different tactics to see what resonates, then keep at it. Some things may work especially well for specific segments.

8 email subject line principles to increase open rates

Master the art of crafting irresistible email subject lines with proven best practices. Learn how to personalise effectively, create a sense of urgency, keep it concise, and test different strategies to find what truly drives opens.

Dive into advanced tips that go beyond the basics and optimise your emails for maximum impact.

Read the full guide

Email Subject Line Principles to Increase Open Rates, on a gradient background.

Hook, line, and 70% of revenue with Klaviyo email and AI

Svenfish serves up fresh seafood daily. With Klaviyo email and AI, their marketing stays just as fresh delivering tailored messages to customers who’ll actually bite.

“I love how Subject Line AI helps us analyse what subject lines have worked in the past, and gives us concise inspiration. I almost always use it to generate subject lines.” Sreevats R., Product manager

Read Svenfish’s story