How to use the ChatGPT ad preview tool
- Enter your verified advertiser name and landing-page domain. The favicon in ChatGPT comes from that domain.
- Write your headline and description. The counters turn amber at the visible limit and red at the field limit.
- Add a prompt your buyer would actually type, so you judge the ad in the context it will appear in.
- Switch between mobile and desktop and fix anything the checker flags.
ChatGPT ad character limits
| Element | Field limit | Typically visible | Feeds relevance? |
|---|---|---|---|
| Headline | 50 characters | ~35 | Yes |
| Description | 100 characters | ~60 on mobile | Yes |
| Image | PNG/JPG, square, min 256×256 | Small thumbnail | No |
| Advertiser name & favicon | Set at account level | Always | Indirectly |
For the full breakdown of each element, read Anatomy of a ChatGPT ad and ChatGPT ads creative best practices. To see what competitors are running, use our ChatGPT ads library guide.
What the copy checker looks for
- Truncation: anything past the visible limit is written for a database, not a reader.
- A concrete specific: a number, timeframe or price beats an adjective.
- Repeating your brand: the advertiser name already shows, so repeating it wastes characters.
- Shouting and hype: all caps, multiple exclamation marks and superlatives such as "#1" or "best ever" read badly under a calm AI answer and invite ad-review problems.
- Prompt fit: whether your copy shares words with the conversation it will sit under, a rough proxy for relevance. Turn the prompt into proper targeting with the Context Hint Generator.
Frequently asked questions
What is the character limit for ChatGPT ads?
The headline field accepts 50 characters and the description 100. The rendered card truncates the headline at roughly 35 characters, so write the important part first.
What do OpenAI ads look like in ChatGPT?
A compact card below the answer with a "Sponsored" label, your advertiser name and favicon, a headline, a short description and a small square image. Ads never appear inside the answer text.
Is this ChatGPT ad preview tool free?
Yes. No signup, no limits, and everything runs in your browser. Nothing you type is sent to a server.
Does better ad copy mean more impressions?
Partly. Headline and description feed relevance alongside your context hints and landing page, and relevance decides delivery and price. The image does not affect whether the ad is shown.
Can I preview ChatGPT ads inside OpenAI Ads Manager?
Ads Manager shows a basic preview when you build an ad. This tool lets you iterate faster, check mobile truncation and test copy against a real buyer prompt before you open the account. See our Ads Manager setup guide.
How much do ChatGPT ads cost?
Costs depend on objective, bid and relevance. Our ChatGPT ads cost guide covers CPM and CPC ranges, and the Reach Calculator estimates what a budget buys.