ChatGPT Ads Image Size Guide (2026)
One square image, six numbers to know. Here are the exact ChatGPT Ads image dimensions — minimum, recommended, and maximum — plus a free tool that resizes any image in seconds.
Short answer: minimum 256×256 px, square PNG or JPG, publicly hosted. Use 1024×1024 for best quality. Resize free with the ChatGPT Ads Image Resizer.
Image Specs Table
| Spec | Value | Note |
|---|---|---|
| Minimum | 256 × 256 px | Hard floor — smaller images are rejected |
| Recommended | 1024 × 1024 px | Sharp on all screens, reasonable file size |
| Maximum | 1200 × 1200 px | Largest accepted; bigger adds weight, not quality |
| Formats | PNG / JPG | PNG for logos, JPG for photos |
| Shape | Square 1:1 | One creative serves every placement |
| Hosting | Public URL | Must load directly, no login wall |
Minimum vs Recommended
256×256 is the hard floor. Anything smaller is rejected by Ads Manager. It renders, but looks soft on high-density screens.
1024×1024 is the sweet spot — crisp everywhere with a reasonable file size. 1200×1200 is the largest accepted value; going bigger only adds weight, never quality.
Rule of thumb: design at 1024×1024, keep text large (it renders as a small thumbnail), and compress JPGs to ~85% quality.
Resize Any Image Free
No Photoshop needed. Upload a photo or logo, pick a preset, crop or fit, and download — all in your browser, nothing uploaded.
Open Image ResizerFrequently Asked Questions
What image size do ChatGPT Ads need?
What image format works best?
How do I resize an image for ChatGPT Ads?
Do I need different sizes for different placements?
SEO Package
- Primary Keyword: chatgpt ads image size
- Secondary: chatgpt ad image size, image dimensions, creative size, image resizer, advertising image size
Mominul Islam — Ridoway Ads Team. Reviewed against OpenAI documentation (Sep 24, 2026).