Free email subject line checker.

Check your email subject lines, 100% free.

Test your email subject lines for free with our simple email subject line checker.

By signing up to our free checker you will also receive our daily TL;DR email, blog alerts and news from MailNinja. Of course, you can opt out at any time.

Email campaign content calendar and planning tool

Here’s the 11 things we check…

Plan your email campaigns - email marketing strategy

1. Word & character count.

Why is this important?

The recommendation by Mailchimp, is to keep your subject lines to no more than 9 words and 60 characters.

2. Spam words.

Why is this important?

Known spammy words can mean your email doesn’t reach inboxes, which is not awesome.

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Plan your email campaigns - email marketing strategy

3. Action verbs.

Why is this important?

Action words like Get, Do, Try and Make are all powerful and action-orientated words to help drive a positive response.

4. Listicle.

Why is this important?

Everyone loves a list, try adding things like ‘9 ways to…’ or ‘the top 7 tips for…’ to help boost your open rates.

Team content collaboration tool
Plan your email campaigns - email marketing strategy

5. Case.

Why is this important?

Studies show using ALL CAPS is bad, lower and Sentence case is ok. Instead, try Title Case for better results.

6. Sentiment.

Why is this important?

A nice positive message stands out from the crowd. Try to write in. a positive tone, not a negative one.

Team content collaboration tool
Plan your email campaigns - email marketing strategy

7. Perspective verbs.

Why is this important?

Writing from your perspective doesn’t resonate with your audience, try writing from their point of view, like ‘Check MY subject line’, not check YOUR, for example.

8. Adverbs.

Why is this important?

An adverb is an action or a doing word, which can help your readers to use their imagination. Try using an adverb for your subject lines, and check the results.

Team content collaboration tool
Plan your email campaigns - email marketing strategy

9. Question.

Why is this important?

Studies show, that by asking a question, you increase open rates. A question can help prompt a response from your audience.

10. Emojis.

Why is this important?

Smart use of emojis in your email subject lines can help make your email stand out in a crowded inbox.

Team content collaboration tool
Plan your email campaigns - email marketing strategy

11. Filler words.

Why is this important?

The main objective is to reduce the words you use to say something. So by removing filler words, you make your subject lines pop!

Check your subject lines for free

Click the big blue button below to try the checker.

By signing up to our free checker you will also receive our daily TL;DR email, blog alerts and news from MailNinja. Of course, you can opt out at any time.

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