Catchy Email Subject Line Generator

Need a subject line for your next email marketing newsletter? Coming up with the right subject line can be incredibly tough: you need to grab attention in a crowded inbox, without your subscribers feeling annoyed or tricked by you.

Our AI-powered Email Subject Line Generator makes life easy for you. It crafts attention-grabbing subject lines that get higher open rates, giving you lots of different options to choose from each time. 

How to Use our Free AI Email Subject Line Generator

Our AI email subject line generator tool is super easy to use. Here’s what to do, step-by-step.

Step 1. Enter a Topic or Keyword for Your Email

First, tell the AI what your email is about, by entering a topic or even a keyword into the first box. You could also paste in your current subject line.

Step 2. (Optional) Select Your Preferred Tone & Writing Style

The Email Subject Line Generator uses copywriting practice and proven email subject line templates to generate compelling subject lines for you. Because of this, and because the subject lines are so short, it’s fine to stick with the “Default” tone and writing style.

If you have a strong brand voice, however, you may want to reflect that in your email subject lines. Go ahead and select any of the 20 different tones from the Tone & Writing Style dropdown:

Step 3. Choose Any of 100+ Different Languages

RightBlogger creates content in US English by default—but that’s far from your only option! The AI can write fluently in over 100 languages, so if you want a subject line in a different language, just select it here.

When you’re ready, click the “Generate” button to generate subject lines. The AI will come up with 10 different options for you:

You can copy any individual subject line using the “Copy” link just below it, or you can copy all your subject line options using the “Copy All” button. (You could then paste these into a spreadsheet or document to go through at a later stage.)

Bonus: Use My Email Subject Line Checklist Alongside This Tool

Whether you’re crafting email subject lines yourself or using AI to help, here’s my personal checklist you can use to make sure you produce a good email subject line every single time.

1. Make sure your subject line tells readers what the email is about (avoid vague subject lines like “Great News!” or “Important Update”)
2. Check that your subject line resonates with your audience’s needs and/or goals
3. Keep it under 50 characters (around 9 words) or you’ll find your subject line gets cut off in many email apps
4. Spark curiosity—without gimmicks that may annoy your audience (e.g. avoid things like “Our Meeting Today” if your recipient doesn’t actually have a meeting booked with you!)
5. Don’t use ALL CAPS or it’ll seem like you’re shouting
6. Avoid using too many words that may trigger spam filters—and don’t use excessive punctuation either
7. Match your subject line to the tone and brand that your audience expect from you
8. If appropriate, use urgency/scarcity words (e.g. “Last Chance” or “Only 4 Places Left”)

How Does the AI Email Subject Generator Work?

It’s easy to get started with this tool—you can come up with a list of subject line ideas in seconds—but when you’re searching for the perfect subject line, it’s helpful to know how to get the most out of every feature.

We’re going to take a closer look at every option, including the advanced ones.

1. Topic / Keyword (What’s Your Email About?)

The AI needs to know what your email’s about … and that’s where the Topic/Keyword box comes in. Got something quite specific in mind? Describe it fully here, or add more details in the “Additional Instructions” box (which we’ll come onto shortly).

2. Tone & Writing Style (Choose from the Dropdown or Create Your Own)

Many bloggers find that the “Default” tone & writing style suits them well—but you’ve got 20 others to choose from, so feel free to experiment! 

Here’s a quick look at the difference Tone & Writing Style can make to your subject lines:

“Fun & Quirky” style:

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You can also create your own custom tone of voice using MyTone. Just give the AI a sample of your writing (or even a video you’ve created) and it’ll automatically detect your tone, saving this as a new MyTone. You can then select your MyTone from any of the Tone & Writing Style dropdowns across all RightBlogger’s tools.

3. Language (Over 100 Options, Plus 4 Varieties of English)

The Language dropdown gives you an incredible range of languages to pick from—ideal if you’re creating email campaigns for a non-English-speaking audience or for a global business.

Here’s the AI coming up with subject line ideas in Spanish:

The RightBlogger AI can also write in 4 different versions of English: US English is the default, but we also have options for the UK, Canada, and Australia. This means your subject lines will always use the right spellings and terms for your country.

4. Additional Instructions (Give the AI Any Extra Information or Special Requests)

The Email Subject Line Generator includes 2 advanced options, which you can view by clicking on the “Additional Instructions & Creativity” link:

The first option you’ll see is for “Additional Instructions”. This lets you give the AI any requests you want about your email subject lines. You can include more information about your topic (or the product/service/etc you’re promoting), or ask for your subject lines to be written in a specific way.

For instance, if you want the subject lines to use normal capitalization, just say so. If you’d like an emoji at the start of each subject line, add that too. You could also request close variations of each subject line for A/B testing, ask for more ideas, or even ask the AI to tell you which idea it thinks is best.

Here, the AI has followed our additional instructions about emojis and capitalization:

5. Creativity (Make Your Subject Lines More Predictable or More Unusual)

RightBlogger’s AI is automatically set to a midpoint of creativity—which is what we recommend. If you want to adjust this, just move the Creativity slider. Left is for less creative (more predictable) and right is for more creative (more unusual).

Email Subject Line Generator FAQs (Frequently Asked Questions)

Got questions about writing the perfect email subject line, or about using the Email Subject Line Generator? Here’s everything you need to know.

How Can I Write Effective Subject Lines for Marketing Emails?

The job of your email subject line is to get the reader’s attention and encourage them to open your email (instead of ignoring it or deleting it unread).

Some techniques you can use are to:

• A/B test your subject lines, so you can figure out what styles and words seem to resonate best with your audience.
• Consider using the recipient’s name in a personalized subject line—this can grab their attention, but it may be more appropriate if they feel they already know you.
• Include a sense of urgency where it makes sense, e.g. if a sale is coming to an end.
• Make sure each email you send is genuinely useful to your audience: that could be helpful tips or information, product updates, or a new product launch. Avoid emailing just for the sake of emailing.

What Other Free Tools Can I Use to Write Email Content and Grow My Business?

RightBlogger is packed with 85+ free AI tools—just sign up for an account to try them out for as long as you want. 

Some great ones to get started with are: 

• Cold Email Generator: instantly create an engaging email that introduces you and your product/service to a member of your target audience—perfect for sales emails
• Newsletter Idea Generator: if you’re stuck for an idea, this brainstorming tool will let you quickly fill out your email marketing content calendar
• Newsletter Generator: beat writer’s block and dramatically speed up your workflow with done-for-you newsletters (any topic and a wide range of purposes)
• Article Writer: draft a full-length article from just a topic or keyword (and optimize for SEO) with our flagship AI content creation tool
• Feature/Benefit/Outcome Generator: give your prospective customers a whole range of reasons to buy with this powerful copywriting tool
• Rewriter: if you need to tweak an email or you want to create variants for A/B testing your marketing strategy, the Rewriter tool is here to streamline the process

We’ve also got lots of blogging tools, ecommerce tools, social media tools, and more. Whatever area of your business could benefit from automation, we’ve probably got a tool for it!

How Do I Sign Up for RightBlogger and How Much Does it Cost?

You can try out all our tools for as long as you want, without paying a penny—just sign up for your free account here.

Want to use advanced features like MyTone, Projects, Knowledge, and Chat, and create unlimited content each month? Get a RightBlogger Pro account, for $29.99/month or $24.99/month when you pay upfront for the year.