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About Lead EstimatorSelect your ideal customer profile to see your estimated reach and potential CS, HQL, BANT, webinar, and MQL leads with Qualent Media.

Free B2B marketing tool

Email Subject Line Tester

Test email subject line length, word count and common editing flags. Create topic-based alternatives and download your review without signing up.

No sign-up. Clear method. Downloadable results.

Start with your inputs.

Review your inputs using a clear method, then copy or download the results. Defaults are illustrative examples.

Maximum 2,000 characters.
Maximum 2,000 characters.

Illustrative example

Your results.

Complete valid inputs to see results.

Review generated text and observations before use. No inputs are sent or saved by this tool.

Method and definitions

Count Unicode characters and words; flag long subjects, excessive punctuation, all-uppercase copy and a defined phrase list. Alternatives use your topic in three fixed writing patterns.

Length preferences vary by audience, device and language. This does not predict open rates or use AI. Run controlled tests and review factual relevance before sending.

Worked example

“A question about your campaign planning” is 39 characters and 6 words. The tool reports those measurements and offers topic-based alternatives.

Use this tool in your workflow

  1. Replace the example inputs with your own figures or facts.
  2. Use matching definitions, units and reporting periods.
  3. Review the method and scope before applying the output.
  4. Copy or download the results for your next planning discussion.

For help turning a plan into a campaign, explore Qualent Media’s B2B campaign strategy services.

A clear basis for your next step

Questions, answered.

Understand the method and the boundaries of the result.

How does this email subject line tester work?

Count Unicode characters and words; flag long subjects, excessive punctuation, all-uppercase copy and a defined phrase list. Alternatives use your topic in three fixed writing patterns.

How should I interpret the result?

Length preferences vary by audience, device and language. This does not predict open rates or use AI. Run controlled tests and review factual relevance before sending.

Can I download my results?

Yes. CSV export includes the inputs, unrounded numeric results where applicable, method and scope. Copy results is also available; if clipboard access is unavailable, a text download is provided. This tool runs in your browser without sending or storing your inputs.

Build a clearer marketing plan.

Discuss your audience, campaign priorities and measurement with Qualent Media.

Discuss your campaign