Spec sheet · OpenAI
ChatGPT ad specs (Nov 2026)
The limits OpenAI documents for ChatGPT ads, with the source for each one. Type your copy in the checker below to see how it fits before you submit.
Limits
| Field | Limit |
|---|---|
| Title | 3–50 characters[1] |
| Body | Up to 100 characters[1] |
| Image | JPEG, PNG or WebP; at least 640 × 640 px[1]Some blogs quote a 256 px minimum. That figure is OpenAI’s minimum for the advertiser icon, not for the ad image. |
| Multi-image ads | 4–6 square (1:1) images sharing one title, body and destination URL; API accounts must be enabled[1] |
| Multi-image call to action | 'Learn more' is the only CTA; every image links to the same URL[2] |
| Destination URL | HTTP or HTTPS, up to 2,048 characters, reachable by OpenAI's ad crawlers[1] |
| Brand name | brand_name: the public advertiser name shown in ads[3] |
| Advertiser icon | sources disagree 256 × 256 px (Account Management) vs 128 × 128 px (API Partner Setup)[3]OpenAI’s Account Management guide asks for at least 256 × 256 px; its API Partner Setup page asks for at least 128 × 128 px. Use 256 px to satisfy both. |
Check your copy
Counts use the limits above. The preview is a representative layout, not OpenAI’s exact rendering.
Answer
Representative layout only. Each channel decides how the ad is finally shown.
Questions
How long can a ChatGPT ad title be?
3–50 characters. Source: OpenAI developer docs, checked 10 Nov 2026.
How long can a ChatGPT ad body be?
Up to 100 characters. Source: OpenAI developer docs, checked 10 Nov 2026.
What image does a ChatGPT ad need?
JPEG, PNG or WebP; at least 640 × 640 px. Source: OpenAI developer docs, checked 10 Nov 2026.
What image does a ChatGPT ad need?
4–6 square (1:1) images sharing one title, body and destination URL; API accounts must be enabled. Source: OpenAI developer docs, checked 10 Nov 2026.
What image does a ChatGPT ad need?
'Learn more' is the only CTA; every image links to the same URL. Source: OpenAI Help Center, checked 10 Nov 2026.
How long can a ChatGPT ad destination url be?
HTTP or HTTPS, up to 2,048 characters, reachable by OpenAI's ad crawlers. Source: OpenAI developer docs, checked 10 Nov 2026.
Sources
- Campaign ManagementOpenAI developer docs · checked 10 Nov 2026
- Creating ads for ChatGPT Ads | OpenAI Help CenterOpenAI Help Center · checked 10 Nov 2026
- Account ManagementOpenAI developer docs · checked 10 Nov 2026