An X ad is a promoted post, so the 280-character post limit is the main constraint — plus a short headline on the website card below it.
Ads on X are promoted posts, which means the familiar 280-character limit governs the body. When you attach a website card, it adds a headline of around 70 characters beneath the post. The post text is where the hook lives; the card headline reinforces the click.
| Field | Limit | Notes |
|---|---|---|
| Post text | 280 characters | The promoted post body — the main copy. |
| Website card headline | ~70 characters | Shown on the link card below the post. |
An X ad is a promoted post, so the post text is capped at 280 characters. An attached website card adds a headline of around 70 characters below it.