Claude Prompts for Marketing Copy That Convert

The short version: Claude writes better marketing copy than most people get out of it because most people ask for "marketing copy" instead of giving it a voice, an audience, a constraint and a real example to copy the rhythm of. Feed it specifics and it will out-write a junior copywriter in thirty seconds. Feed it vague instructions and you'll get the same beige LinkedIn-ready nonsense everyone else is publishing.

Why most Claude marketing prompts produce the same flat copy

I read a lot of AI-generated marketing copy now, because everyone sends it to me to check before it goes out. It all sounds the same. "open up your potential." "Take your business to the next level." Full of words that mean nothing and could apply to any product in any industry. That's not a Claude problem, it's an instructions problem. If you type "write a Facebook ad for my coaching business," Claude has nothing to work with, so it reaches for the most generic version of a coaching ad it's ever seen. Garbage in, beige out.

The fix isn't a magic prompt. It's giving Claude the five things a decent human copywriter would ask you for before they'd agree to write a word: the audience, the one thing that makes you different, the format and length, the tone with an example, and what success looks like for this specific piece. Skip any one of those and the copy gets soft.

The five-part structure that works

I use this shape for almost every marketing prompt I write in Claude, whether it's an email, an ad, a landing page or a LinkedIn post:

• Who it's for - not "small business owners" but "owners of 5 to 20 person service businesses who are too busy to do their own marketing and have been burned by an agency before"
• The one differentiator - the actual reason to pick you over the next option, stated plainly, not three vague benefits
• Format and constraint - word count, platform, and anything it must or must not include
• Tone with an example - paste three sentences you've written yourself and say "match this rhythm," because adjectives like "friendly but professional" mean nothing to a model
• The job the copy has to do - get a click, get a reply, get a sign-up, stop a scroll, whatever it is

Leave out the tone example and you'll get something that reads like it was written by a committee. That one step, pasting your own writing in, makes more difference than any clever phrasing of the instruction itself.

A worked example

Say you run a small accountancy practice that specialises in contractors and freelancers, and you want a cold email to send to IT contractors who've just gone limited company. Here's a prompt built on that five-part structure:

"Write a 120-word cold email to UK IT contractors who've just set up a limited company and are doing their own books for the first time. The differentiator: we specialise only in contractors, so we know the IR35 and dividend rules cold, unlike a generalist accountant who handles everyone from dentists to landlords. Tone: direct, a bit cheeky, no corporate waffle, match this style - 'Most accountants will happily take your money and give you generic advice. We only do contractors, which means we know the rules that affect you.' The email needs to get a reply booking a 15-minute call, not just an open. End with one specific, low-pressure question, not a generic CTA."

Run that and you'll get something with an actual point of view, a real reason to reply, and none of the "I hope this finds you well" padding. Then ask Claude for two more versions with different opening lines so you've got something to test, because the first draft is never the one you send without changes.

The uncomfortable bit nobody tells you

Here's what most posts about AI marketing prompts skip over: if your offer is weak or undifferentiated, no prompt fixes that. Claude will cheerfully write you a confident, punchy email for a business that has nothing distinct to say, and it'll sound fine and convert at the same middling rate your current copy does, because the problem was never the writing. I've seen people spend hours refining prompts to get better adjectives when the real issue is they're the fourth identical competitor in their market and the copy can't invent a differentiator that doesn't exist. If you can't fill in "the one differentiator" field that's the thing to fix first, not the prompt.

The other thing people avoid saying out loud: AI copy needs editing by someone who understands the business, every time, no exceptions. Claude doesn't know your actual client won't book a call on a Friday, or that the word "solutions" makes your founder wince. You're still the editor. Treat the first output as a draft from a fast, slightly overconfident junior, not a finished asset.

Prompts for different formats

The five-part structure flexes across formats, but each one has its own quirk worth knowing:

• Facebook and Instagram ads - tell Claude the exact character limit for the platform and ask for three hook variations for the first line, since that's what gets tested most
• Email subject lines - ask for 10 at once and tell it to avoid anything that sounds like clickbait or a spam trigger word; you'll bin half but the other half is usable
• Landing page headlines - give it the single biggest objection your buyer has and ask the headline to defuse it directly, not just state a benefit
• LinkedIn posts - paste in two of your own past posts that did well and ask Claude to study the structure, not the topic, before writing a new one

If you're building prompts you'll reuse weekly, it's worth keeping a running swipe file of the ones that worked, the same way you'd keep a CLAUDE.md file of standing instructions for a coding project; the logic is identical, you're just giving the model memory of what "good" looks like for your brand instead of starting cold every time, which is covered in more depth in our piece on the CLAUDE.md file.

Where this fits into a bigger system

Marketing copy prompts work best when they're not the only thing you've taught Claude about your business. If you've already used it to think through your positioning with something like our Claude prompts for business strategy, you can paste that context straight into your copy prompts and skip re-explaining your differentiator every single time. Same goes for research: if you're writing copy off the back of a report, case study or competitor analysis, use our guide to summarising PDFs first so Claude is working from a tight brief instead of a 40-page document you've pasted in raw.

If you're doing this at any volume, the Claude Console is worth setting up rather than working entirely in the chat window, because it lets you save and reuse prompt templates with variables instead of retyping the same structure every time. And if none of this is landing and you'd rather someone build the prompt library and the workflow for you, that's exactly the kind of thing covered in our guide to working with an AI consultant for a small business.

A quick checklist before you hit send on any Claude copy prompt

• Have you named a specific audience, not a category
• Have you stated one differentiator in plain words, not three fluffy benefits
• Have you given a word count or character limit
• Have you pasted an example of the tone you want, in your own words
• Have you told it what action the copy needs to cause
• Have you asked for two or three variations to test, not just one

Six questions, thirty seconds to answer them, and the difference in output quality is not subtle.

Frequently asked questions

Can Claude write marketing copy that sounds like my brand?

Yes, but only if you give it examples of your actual writing to match. Describing your tone in adjectives like "friendly" or "bold" gets generic results; pasting three real sentences you've written and asking Claude to match the rhythm gets usable results.

Is Claude better than ChatGPT for marketing copy?

Both can produce strong copy with good prompts. Claude tends to handle longer, more nuanced briefs and follows detailed constraints more consistently, which matters for brand voice work, but the biggest factor in quality is still the prompt, not the model.

How long should a marketing prompt be?

Long enough to cover audience, differentiator, format, tone example and the action the copy needs to drive. That's usually three to six sentences. Shorter than that and you'll get generic output regardless of which AI tool you use.

Should I always edit AI-written marketing copy before publishing?

Always, with no exceptions. Claude doesn't know your customers' specific objections, your internal jargon rules, or what's happened in your market this week. Treat its output as a strong first draft from a fast junior copywriter, not a finished piece.