Email Subject Line Generator
Get subject lines that fit your email and your details. Choose the type of message, enter the topic and an optional offer or deadline, and pick a tone. Every suggestion is checked for length and for the patterns that send mail to the spam folder.
- Private by default
- No sign-up
- Free to use
Subject lines
Written by AI
Check your own subject line
How to use Email Subject Line Generator
- Choose the type of email, such as a newsletter, a promotion or a follow-up.
- Enter the topic or product, and optionally an offer, a deadline and your brand name.
- Pick a tone and read the suggestions; select More ideas to rotate through further patterns.
- Copy a line you like, or paste your own subject into the checker to see how it measures up.
Email Subject Line Generator features
Ten email types
Newsletter, promotion, launch, event, welcome, follow-up, abandoned cart, win-back, cold outreach and feedback request.
Uses your details
Topic, offer, deadline and brand are placed into the lines, so nothing has to be rewritten from a generic template.
Four tones
Neutral, friendly, curious or urgent wording.
Built-in checker
Character count, mobile cut-off warning, spam-filter words, capitals, punctuation and emoji.
Check your own line
Type any subject line to run the same checks on it.
Optional AI wording
When the site has an AI model connected, a button asks it for additional lines based on the same details.
When to use Email Subject Line Generator
- Finding a subject for this week's newsletter when the obvious one feels stale.
- Preparing two or three variants for an A/B test.
- Checking that a campaign subject will not be cut off on phones.
- Wording a follow-up or outreach email so that it reads as personal rather than promotional.
Email Subject Line Generator FAQ
How long should an email subject line be?
Aim for 30 to 50 characters. Phone mail apps in portrait mode show roughly 35 to 40 characters, desktop clients around 60. Put the important words at the beginning so that a cut-off line still makes sense.
Which words trigger spam filters?
Modern filters judge the whole message and the sender's reputation, not single words. Even so, lines stuffed with phrases like “free”, “act now”, “guaranteed” or “click here”, especially with capitals and exclamation marks, resemble junk mail to both filters and people. The checker flags the classic ones so you can decide.
Should I use emoji in subject lines?
One relevant emoji can help a subject stand out in a consumer newsletter, and it takes little space. More than one looks cluttered, some mail programs replace them with empty boxes, and in business correspondence they often seem out of place. Test with your own audience.
Does personalisation help?
Mentioning something specific to the reader, such as a product they looked at or their city, tends to work better than inserting a first name, which readers have learned to ignore. Specific beats clever: a line that says exactly what is inside is usually opened by the people who care about it.
How are the suggestions created?
They are assembled in your browser from a library of subject-line patterns for each email type and tone, filled with the details you enter. If the site operator has connected an AI model, an extra button sends the same details to it for more varied wording.
Is it honest to write urgent subject lines?
Only when the urgency is real. A deadline that exists is useful information. Invented scarcity may lift one campaign and then teaches readers to distrust the next. The same applies to “Re:” prefixes on messages that are not replies, which the checker marks as a problem.
Writing subject lines that get opened
The subject line and the sender name are all a reader sees before deciding whether to open a message. The decision takes a second or two and is made in a list of dozens of other subjects. In that setting, clarity wins. A reader who understands at a glance what the email contains and why it matters to them will open it if it is relevant, and that is the reader you want.
Good subject lines tend to share a few traits. They lead with the specific thing: the product name, the event, the number. They leave out filler such as “newsletter” or the company name when the sender field already shows it. They make one promise and the email keeps it. Curiosity works when the answer is truly inside, and backfires when the line is merely vague.
Length is a practical constraint, not a rule of persuasion. Since a large share of email is first seen on a phone, anything beyond about forty characters may be hidden. Rather than counting obsessively, write the line, then check which words would survive a cut-off. If the meaning sits at the end, turn the sentence around.
Finally, treat every suggestion, whether from a pattern or from an AI model, as a draft. You know your readers and what you have sent them before. Pick two candidates that say different things, send each to part of your list, and let the opens and, more importantly, the clicks tell you which kind of line your audience responds to.