Subject Line Generator

Create compelling email subject lines that boost open rates

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Generating subject lines...

Powered by OpenAI

How it works

1

Describe your email — paste the content or briefly describe what the email is about. The more specific you are, the better the output.

2

Pick a tone — choose from professional, friendly, urgent, casual, persuasive, or creative depending on who you're writing to and why.

3

Copy and send — select the subject line that fits, copy it, and you're done. You can also regenerate if you want a fresh set.

What makes a subject line work

Keep it under 60 characters. Most mobile inboxes cut off subject lines around 40–60 characters. Shorter subjects are more likely to display fully and get read — aim to front-load the important part.

Avoid spam trigger patterns. Words like "free," "guaranteed," excessive caps, and multiple exclamation marks can flag your email before it even reaches the inbox. Straightforward language typically performs better.

Specific beats generic. "Your invoice for April is ready" outperforms "Important update" every time. If the subject line could belong to any email from any sender, it probably isn't pulling its weight.

Frequently asked questions

Yes — no sign-up needed for basic use. If you want saved history and team features, those are available on the Eskra paid plans.

Each generation returns multiple options across different angles, so you can A/B test or just pick whichever fits best. If none of them land, hit Regenerate for a fresh set.

Yes — select the Persuasive or Professional tone and describe your offer clearly in the content field. The more context you give about what you're offering and who you're contacting, the more useful the output.

The tool generates output in whatever language you write in. Eskra also has dedicated versions in French, German, Spanish, Portuguese, Italian, Japanese, Russian, Chinese, and Hindi.

This tool is built specifically for email subject lines — it's faster, more focused, and you don't need to write a prompt. Just describe the email, pick a tone, and get results. ChatGPT will do it too, but you'll spend time crafting the right ask every time.