Email Subject Line Generator

Asking for “10 subject lines” usually gets you 10 versions of the same line. This generator gives each one a different job, in a fixed order, so you get a real spread to test:

• Clear and direct, Benefit and Specific detail: say what the email is and why it matters.
• Curiosity and Question: make people want to open, without clickbait the email can't back up.
• Offer and Deadline: used only when you add a real offer or deadline under Details.
• Short, Personal, Playful and more to fill the rest.

Each line sits in its own box with a character count, so you can see at a glance which ones fit. Shopify's advice is 3 to 6 words, or under 50 characters, so the subject stays readable on a phone.

The output ends with two picks to test first. Send each to a small, random part of your list, then send the winner to the rest. Many email tools can run this split test for you.

1. 01

   Shopify Messaging

   When you create a campaign, enter the subject line and the optional preview text. To personalize, click the Personalize icon and set a default value for customers without a name. You can use at most 2 personalization values across the subject and preview text.

2. 02

   Klaviyo and others

   Paste the subject and preview text into their fields and swap [First name] for the tool's first-name tag with a fallback. Klaviyo notes that without preview text, inboxes pull the first text in the email instead.

3. 03

   WooCommerce

   WooCommerce sends order emails, not campaigns. Send campaigns from an email platform connected to your store.

• Deceptive subject lines are illegal in the US. The CAN-SPAM Act says the subject line must accurately reflect the content of the message. No fake “Re:” or order updates.
• Fake urgency backfires. The generator only writes a deadline or offer you give it.
• Skip ALL CAPS and strings of exclamation marks. Shopify's writing guide advises against both.