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As of 13 August 2026, AI can generate subject lines for your marketing emails.
Most people should do this themselves; the prompt is on this page.
Can you do it?
5 minutesto a draft.
15 minutesto something you’d act on.
Cost, all in£0
Skill needednone
Who has to check ityou
What the alternative costsAnyword is a purpose-built marketing tool that scores copy against predicted performance.
If this goes wrong: the subject line is bland, misleading or poorly matched to the email, so you replace it before sending or stop the campaign after weak engagement.
What to actually do
Do it yourself
The route this page recommends
A chat interface, no skill needed, and roughly 15 minutes until you can act on the result.
How to actually do it
- Open the marketing email draft, campaign brief, current offer details and brand style guide.
- Gather the exact audience, email purpose, offer, deadline, required wording, maximum length and words or claims that are not allowed.
- Paste those details into the prompt and replace every bracketed slot with confirmed information.
- Ask the chatbot for the subject lines and recommended shortlist using the prompt exactly as written.
- Compare every drafted line with the email, offer terms, landing page, price list and campaign deadline, and remove any line containing an unsupported claim.
- Choose the strongest remaining options for your audience and, if your email platform supports it, set up a subject-line test before sending the campaign.
Prompt
Generate 15 subject lines for this marketing email. Business or organisation: [NAME] Audience: [WHO WILL RECEIVE IT] Email purpose: [SALE, LAUNCH, NEWSLETTER, EVENT, UPDATE OR OTHER] Main offer or message: [OFFER OR MESSAGE] Important details that must be accurate: [DETAILS] Brand voice: [PLAIN, WARM, PLAYFUL, FORMAL OR OTHER] Words, claims or punctuation to avoid: [LIST OR NONE] Maximum length: [NUMBER OF CHARACTERS, OR WRITE "NO LIMIT"] Use British English. Keep every line accurate to the information provided and do not invent discounts, deadlines, stock levels, benefits or urgency. Make the lines distinct rather than minor rewrites. Include a mix of direct, benefit-led, curiosity-led and specific options, but do not use misleading clickbait. Return a table with the subject line, approach and any factual detail I need to confirm. Then recommend the three strongest options and explain which audience or message each suits. Do not write preview text unless I ask for it.
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
Use a tool built for this
Second choiceHand it to a person
The distant thirdA person who owns the outcome does this end to end, worth it when the failure is dear.
What it gets wrong
- AI cannot know which promise your existing audience will trust or reject without campaign context and past results.
- AI cannot decide whether a curious subject line fits your brand or crosses into misleading clickbait.
- AI cannot confirm that a deadline, discount, price or stock claim is still true unless you provide and check the current source.
- AI cannot replace your email platform's delivery, segmentation and subject-line testing data.
- AI gives you plausible options, not a guarantee that recipients will open or act on the email.
Even on a YES, the friction has a name: taste and judgement under ambiguity.
How we scored this
Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.
| Axis | Score (0–2) |
|---|---|
| Output | 2 |
| Inputs | 2 |
| Verification | 2 |
| Liability | 2 |
| Effort delta | 2 |
| Total | 10 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can AI write good email subject lines?
- Yes. It can quickly produce varied options from your audience, offer and brand rules, but you still need to remove unsupported claims and choose the line that fits your relationship with the audience.
- Will AI-generated subject lines increase my open rate?
- Not necessarily. AI can suggest and vary subject lines, but only your campaign data can show how recipients respond, and an attractive line cannot fix an irrelevant offer or poorly targeted email.
- Is it safe to use AI for marketing email subject lines?
- It is generally safe for drafting when you provide only the campaign information needed and check every factual claim before sending. Do not paste customer lists or identifiable customer details into a chatbot unless your organisation has approved that use and the required permissions are in place.
- What information should I give AI to write an email subject line?
- Give it the audience, email purpose, exact offer, confirmed deadline, brand voice, length limit and words or claims to avoid. Include the email or a concise summary so the subject line matches what the recipient will actually find inside.
Nearby answers
- Can AI analyse click-through rates in my email campaigns?YES
- Can AI analyse the open rates of my email campaigns?YES
- Can AI check whether my marketing emails comply with PECR?PARTLY
- Can AI check whether my email consent process follows UK GDPR?NO
- Can AI choose a CRM for email marketing for my UK business?PARTLY
- Can AI choose an email marketing platform for my UK business?YES
Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.
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