Email Subject Line Generator

Free AI-Powered Subject Line Ideas to Drive Open Rates

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Email Subject Line Generator

How to get the most out of generative text.

Don't Settle for Snooze-Worthy Email Subject Lines: Try Our Free AI Tool and Watch Your Email Open Rates Soar!

Is this just another AI spinning tool that generates the same subpar subject lines that everyone else is using? Nope. We’ve trained our AI subject generator by sharing the most effective email subject lines we’ve been used at Close for more than a decade. 

A word of warning: don’t just drop these subject lines into your next email sequence and hit send. Think of our automation tool as a brainstorming buddy. Read the lines it suggests, then make your own changes to make them sound more human. The goal is to write better email subject lines faster, not just get more boring titles to test. 

Take the time to add a human touch, use language your prospects understand, and even add names if that is your style. Remember, email is all about building relationships, not just vanity metrics.  

Here’s an example of subject lines generated using our AI tool. As you can see, it’s a great start, but it still needs a human touch—that’s where you come in.

Once you’re done, these subject lines are ready to be added to your next email campaign. 

How to Use this AI Email Subject Line Generator to Increase Your Open Rates 

Let's face it, not all of us are born wordsmiths. Trying to write that perfect email subject line isn’t always an easy task. Plus, it eats away at precious time you could spend engaging with potential customers–or crafting the perfect email body. 

I’ve got good news: Close's ChatGPT-powered subject generator is the ultimate solution to your subject line struggles. With a simple click of a button, you'll receive 10 completely customized subject lines that will help skyrocket your email open rates and your sales close rates. It's pure magic, my friends!

Here's how this beauty operates:

1. Type in Your Email Topic 

Start by giving our free tool information about your email. Are you trying to book more meetings, get guests on your podcast, or follow up on a cold email? Let the tool know! 

Start by explaining the subject of your email. 

Try to be detailed–are you connecting with cold prospects or encourage a current customer to upgrade to a higher package? Have you already reeled them in with your content marketing or are they totally new to your business? What type of business are you in? The more information you give the tool, the better your email subject lines will be! 

2.  Hit “Generate Email Subject Lines” 

That’s literally it! The tool will generate a list of 10 different subject lines related to the description you provided. Choose one that fits your email the best, tweak it to make it more personal, and add it to your email campaign.

3. Test Different Prompts 

But wait, there’s more. Remember, the tool only has one or two lines to go on, so if your first batch of email lines doesn’t hit the spot, try a different prompt. For example, you could add more details: 

You can even add a suggestion for the tone, like this one: 

Once you find a few you like, hit “copy to clipboard” and take the time to make them your own. Add key terms you’ve had SEO success with, use them for A/B testing, spice up a campaign with low open rates, or just send out that clever email to your team. Then, add those clever new subject lines to your CRM, your email marketing platform, or add them to your newest email templates. The choice is yours! 

The Fundamentals of Writing Email Subject Lines that Actually Convert 

Remember, AI writing tools, like our email subject line generator, serve as a starting point. Think of it like a first draft or a collaboration partner. Don’t just grab the first email subject line the tool spits out and expect to see a 1000% increase in open rates. 

With more than a decade of experience sending sales emails, we’ve learned a bit about nailing email subject lines. Here are our top tips for email subject lines that actually work: 

1. Know Your Potential Customers & Prospects

Before you begin crafting your email subject lines, take some time to get to know your target audience. Where are they located? What topics are they interested in? What pain point keeps them up at night? When you really know who you’re talking to, you can tailor your subject lines to resonate with their needs.

Consider collaboration with other teams, including your support and marketing team to understand what language is likely to resonate with your target audience.  Use all this info to create hyper-personalized, relevant subject lines.  You can also check out our 61 proven email subject lines for more inspiration. 

2. Keep Your Email Subject Lines Short 

The subject line of your cold emails is, without a doubt, the most crucial part of any email campaign. Why? Because if it fails to grab your prospects' attention, they won't even bother opening your email, and all your hard work will go down the drain.

So, what's the secret to crafting an irresistible sales email subject line? 

Keep it short and sweet. You could go on and on with a lengthy subject line, but guess what? Email clients will just chop it off. Do yourself a favor and stick to a neat 20 to 40 characters. That gives you enough room to catch their eye.

3. Reel Them in With an Intriguing Hook 

Pause for a moment and take a sneak peek into your bustling inbox. Chances are, you'll find a swarm of emails eagerly vying for your attention. Now, imagine this: your subject line is the shiny lure, the irresistible bait that can either entice your prospects to bite or make them swim away.

How do you ensure your hook is irresistible? It's all about standing out from the crowd. Consider leveraging the power of curiosity, posing a thought-provoking question, or teasing them with a tantalizing hint of what awaits inside your email. Craft your subject line with precision, making it impossible for your prospects to resist clicking that open button.

Remember, the goal is to build a genuine connection with your prospects right from the subject line to the closing line of your email. By mastering the art of reeling them in with an attention-grabbing hook and delivering meaningful content, you'll not only capture their attention, but also forging a lasting business relationship.

4. Avoid Spam Words (and Think Hard About Those Emojis) 

The best subject lines are catchy and pique your contact’s interest. But your email subject lines can also land you in the spam box. Most email providers use spam filters and algorithms that send emails with specific words straight to the spam folder. So, how do you avoid the spam box? Avoid using spam words like: 

  • Cash
  • Free 
  • Get paid now 
  • Perfect
  • Unbelievable 
  • 100% Off 
  • Cures 
  • Act Now 

Emojis are another feature that can kill your email marketing campaign before it's even started. One study found emojis increase negative sentiment towards emails and don’t increase open rates. They might make sense for your audience, but take some time to consider whether it's really a good fit for your business before giving them a go. 

5. Inject (a Little) Urgency

Spare us the cliché subject lines like "LAST CHANCE BEFORE THIS AWESOME DEAL IS GONE FOREVER." That's so 2001. Instead, infuse your subject line with genuine urgency. Highlight the benefits they'll miss out on or the amazing results they could achieve with your help.

Consider adding specific deals, numbers, or a time frame that highlights what they’re really missing out on if they don’t open your email. 

6. Get Your Email Copy Right 

Good email subject lines are just the start. Whether you’re sending cold emails or trying to get current customers to sign up for that awesome webinar you’re hosting, take the time to craft an email that provides value, addresses customer pain points, or convinces them to hit that ‘reply’ button. The content of your email can make or break campaign success, so don’t leave your audience hanging! 

And if you’re not a copywriting expert, consider using our cold email generator to create a first draft of your email. Just provide info about your business and the type of email you want to create, and hit ‘generate.’ 

How Our Easy-to-Use Email Subject Generator Tool Works with GPT 

This free email subject line generator is AI-powered and designed to provide simple subject lines you can use now. 

We built this AI email subject line tool using GPT-3 & GPT-4 artificial intelligence technology from OpenAI (AKA, the infamous Chat GPT), and trained it with the most effective subject lines our Close sales team has used for the past decade. 

This AI tool is 100% free for anyone to use. No pricing plan, no “free for now, but later we’ll charge you.” We don’t need your credit card or your mother’s maiden name.  We strongly believe in the power of email to drive sales, and we know this tool will help make your email even more effective. 

Who is This Email Subject Line Generator Best For?

We designed this AI subject line generator to craft highly effective subject lines, no matter what your goal is.  So, what are the best use cases for our free tool? Try it out for these types of emails: 

  • Cold emails: Break the ice and warm up those prospects with catchy email subject lines that make prospects want to get to know you better. 
  • Newsletters: Spice up your newsletters with subject lines that make your subscribers eagerly dive into your content.
  • Follow-up emails: Revive those stagnant conversations with subject lines so engaging, they’ll be filling your inbox with responses. 
  • Abandoned cart emails: Whether you’re a SaaS company or an eCommerce giant, the right email subject line can send indecisive shoppers rushing back to complete their purchase. 
  • Thank you emails: Show your gratitude in style by using subject lines that bring a smile to your customers' faces and make them feel like VIPs.
  • Introduction emails: Make a memorable first impression with subject lines that ensure your message won’t get lost, even in an overflowing inbox. 
  • Office pranks: Maybe this one isn't a typical use case, but imagine using the subject line generator to craft hilarious email subject lines to prank your colleagues on April Fool's Day or any day that calls for some light-hearted mischief. Proceed with caution, and laughter!

Remember, always consider your audience, brand voice, and the context in which you're using these subject lines. Let our email subject line do its thing and watch your open rates soar.

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