Tools

Email Subject Line Generator

Create attention-grabbing subject lines that boost open rates. Generate multiple options tailored to your audience and purpose.

Why Use Our Email Subject Line Generator?

AI-Powered Optimization
Our tool uses advanced AI to create subject lines that are proven to increase open rates and engagement.
Audience-Focused
Get subject lines tailored to your specific audience, whether it's colleagues, customers, or friends.
Multiple Options
Generate 5 unique subject lines for each request, giving you choices to find the perfect fit.
Style Variety
Choose from different styles to match your email's purpose and tone.

Want to generate subject lines right in Gmail?

Install the Aiko Gmail plugin to create engaging subject lines directly in your inbox. Write attention-grabbing emails faster with our AI-powered tools integrated into Gmail.

Install Gmail Plugin

Email Subject Line Best Practices

Keep It Concise

The ideal subject line length is 40-50 characters. Mobile devices show even fewer characters, so put important words at the beginning.

Be Clear and Specific

Your subject line should accurately reflect the email's content. Avoid vague or misleading subject lines that could be seen as clickbait.

Create Urgency (When Appropriate)

Use time-sensitive language when relevant, but don't manufacture false urgency. Words like "today," "now," or "limited time" can be effective when used honestly.

Personalize When Possible

Including the recipient's name or relevant details can increase open rates. However, ensure your personalization feels natural and not forced.

What to Avoid in Subject Lines

Spam Trigger Words

Avoid words like "free," "guarantee," "buy now," or excessive punctuation that can trigger spam filters.

ALL CAPS and Multiple Exclamation Points

Using all capital letters or multiple exclamation points can appear unprofessional and trigger spam filters.

Clickbait Tactics

Don't use misleading or sensational subject lines. They may get opens initially but will harm your credibility long-term.

Excessive Symbols

Using too many symbols (★, ♥, →) can make your email look unprofessional and trigger spam filters.

Frequently Asked Questions

How does the subject line generator work?

Our AI analyzes your email description, target audience, and desired style to generate subject lines that are likely to engage recipients and drive opens.

Why do I get multiple subject line options?

We provide 5 options so you can choose the one that best fits your specific needs and preferences while maintaining the core message.

Can I use this for marketing emails?

Yes! Our generator is perfect for marketing emails, newsletters, and promotional content. Just select the appropriate audience and style options.

Are the generated subject lines spam-compliant?

Yes, our AI is trained to avoid common spam triggers and create compliant subject lines that won't get caught in filters.

Tips for Writing Effective Subject Lines

Keep it Short and Sweet

Aim for 30-50 characters (6-8 words). Mobile users often see only the first 25-30 characters, so front-load important words.

Create Urgency (When Real)

Use time-sensitive language when appropriate: "Today only," "Limited time," "Deadline approaching." But never fake urgency.

Personalize When Possible

Include the recipient's name, company, or reference to their work. Personalization can increase open rates by up to 50%.

Spark Curiosity

Create an information gap that makes readers want to learn more, but avoid clickbait. The subject line should still reflect the email's content.

Use Numbers & Lists

Numbers stand out in crowded inboxes. "5 Ways to..." or "3 Tips for..." can make your subject line more scannable and appealing.

Test Different Approaches

A/B test different subject lines to see what works best for your audience. Track open rates and adjust your strategy accordingly.

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