FREE TOOL

Email Subject Line Tester

Test the performances of your email's subject thanks to our free subject tester tool.

Loading

Currently testing your subject line

Something went wrong

We could not test that subject line right now. Please try again

Your subject line

{{ original.sentence }}
{{ original.score }}

Alternatives from GPT-3

{{ alternative.sentence }}
{{ alternative.score }}

Alternatives from GPT-3

Oh snap! No alternatives received from GPT-3. You might have reached the limits for today.

The fastest way to verify an email subject line

Email Subject Line Tester by Mailmeteor scores an email subject line in a few seconds for free, providing as well alternative subject lines. Checks are made at multiple levels: length, number of words, number of question mark and exclamation points, presence of emojis or spam words, to make sure your email will be well received by your audience.

Other tools

Email Permutator

Find anyone's email address thanks to our free email permutator

Spam Word Checker

Make sure your emails don't land in spam with our free spam words checker

Trusted by 4 million professionnals

Questions & answers about email subject line tester

Everything you need to know about how and why checking email subject lines.

Email subject line tester is a free, easy to use and simple tool. Just enter the email subject line and click on "Test". We will then proceed with a test providing you alternative subject lines and scoring all of them so you can you choose the best option for your email.
Email subject line tester is a free tool to test anyone's email subject line. It tests that the email subject line is well conceived, with the good length and without too much spam related wording. In case we detect something wrong, the email subject line score will decrease.

Email subject line tester proceeds with several checks to determine if an email subject line is valid:

  1. The email subject must be well formed, not too short and not too long.
  2. It should be grammatically correct, with first letter as a cap and ponctuation.
  3. The email subject can include emoji but they should not be too numerous.
  4. The subject line should not contain spam words.

Depending on the provided email subject line, we might apply extra-checks on a per basis.

Email Subject Line Tester is totally free to use. Mailmeteor makes it available to anyone interested in checking an email subject line and make sure you will be read.

We apply a fair-use policy, so you are free to manually use Email Subject Line Tester as long as you don't abuse of it. Any abuse includes, but is not limited to, making automatic requests to our service.

Your data stays yours - like all products made by Mailmeteor. Email addresses that you verify using our email subject line tester are not saved by us nor shared with a third-party. Although, we might temporarly log requests made to the service for maintenance purposes.

With this said, this page has Google Analytics and is protected by reCAPTCHA. Consequently, the Google Privacy Policy and Terms of Service apply.

Once you have verified your email subject line and found the most efficient, you can send a highly personalized email campaign using Gmail with Mailmeteor. Mailmeteor lets you send mass emails in Gmail that feel personal. It’s the most popular Gmail mail merge tool, Trusted by 4 million people worldwide for its simplicity and privacy focus.

Questions? Comments?

Feel free to let us know what you think.

How satisfied were you with the results?

Brought to you by Mailmeteor

The Best Rated Mail merge for Gmail

GET STARTED WITH MAILMETEOR