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Check your marketing claims before you publish

You're about to say "best in town", "eco-friendly", "guaranteed" or "50% off" in an ad or post. Get every claim checked against what you can back up, before someone complains.

Updated 17 Oct 2026

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The prompt · ChatGPT

Check the claims in my marketing before I publish it.

What it is: [ad, post, web page, leaflet]
The text: [paste it]
Evidence I have: [e.g. reviews, test results, supplier certificates]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. Every claim in the text, in a list.
2. For each: what proof I'd need, whether I seem to have it, and a risk note.
3. Safer wording for anything I can't back up.
4. Extra care on green claims, price comparisons, "free" and "guaranteed".
5. Links to the ASA's advice and the CMA's Green Claims Code so I can check myself.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts or results. UK English. This is a checklist, not legal advice.

For the ASA's advice and the CMA's Green Claims Code, use web search and name the page you used. If it doesn't search on its own, open View all tools and choose Search.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.

A short example

Fill the blanks, then paste. ad, post, web page, leaflet: a short note you already have. paste it: a short note you already have. Leave the rest of the prompt as written.

The prompt · Gemini

Check the claims in my marketing before I publish it.

What it is: [ad, post, web page, leaflet]
The text: [paste it]
Evidence I have: [e.g. reviews, test results, supplier certificates]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. Every claim in the text, in a list.
2. For each: what proof I'd need, whether I seem to have it, and a risk note.
3. Safer wording for anything I can't back up.
4. Extra care on green claims, price comparisons, "free" and "guaranteed".
5. Links to the ASA's advice and the CMA's Green Claims Code so I can check myself.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts or results. UK English. This is a checklist, not legal advice.

For the ASA's advice and the CMA's Green Claims Code, use Google Search and name the page you used.

Stay in this Gemini chat. Leave extensions off, including Gmail and Drive.

A short example

Fill the blanks, then paste. ad, post, web page, leaflet: a short note you already have. paste it: a short note you already have. Leave the rest of the prompt as written.

1

You paste the ad, post or page.

2

The assistant asks what evidence you have for each claim.

3

You get every claim listed, a risk note for each and safer wording, with links to the official guidance.

What happens

Use Gemini to check your marketing claims before you publish

You're about to say "best in town", "eco-friendly", "guaranteed" or "50% off" in an ad or post. Get every claim checked against what you can back up, before someone complains.

Tools

Paste the prompt, fill the blanks, copy the draft.

  • Gemini — required. Drafts from the text you paste. Nothing is sent.

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