Email Subject Line Generator
Subject lines in sentence case, the way real inboxes show them, with the character count against the point where a phone cuts them off.
How to use this tool
- 1Type what the email is actually about, in plain words.
- 2Open Options to set the tone — casual for a newsletter, professional for a client.
- 3Press Get Titles.
- 4Check the character count before you copy. Under 40 is safe on a phone.
Click the "Get Titles" button above to see titles.
What actually gets opened
Specific beats clever. "Your invoice for March" is opened more often than "A little something for you", because the reader can tell what it is and decide in one glance. Curiosity works only when the reader already trusts the sender — from a stranger it reads as bait.
The preview text matters too
Every inbox shows the first line of the email next to the subject. That line is real estate most senders waste on "View in browser". Treat the subject and that first line as one sentence, and you get roughly double the space to make your case.
Frequently asked questions
How long can a subject line be?
Phones show roughly 35 to 40 characters, and most email is read on a phone. Desktop clients show more, but writing for the shorter limit costs you nothing and means the whole line is visible to everybody.
Why are these in sentence case?
Because that is how people write email. A subject line in Title Case reads as a marketing blast, and readers have learned to skip those. Sentence case reads as a message from a person.
Do emoji in subject lines help?
Results are mixed and they are easy to overdo. One relevant emoji can lift opens slightly; two or more looks like spam, and some corporate filters score them against you. Test before you rely on it.
What about spam filters?
Avoid all caps, rows of exclamation marks, and the words filters have been trained on for twenty years — free, guaranteed, act now, risk-free. A plain, specific subject line is also the one least likely to be filtered.
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