Short answer
For Google uploaded image ads, keep files at 150 KB or less and cover the core sizes: 300 × 250, 336 × 280, 728 × 90, 970 × 250, 300 × 600, 160 × 600, 320 × 50 and 320 × 100. Animated GIFs must stop within 30 seconds and run slower than 5 frames per second; HTML5 ads can be up to 600 KB with no more than 40 files. Responsive display ads need 1200 × 628 and 1200 × 1200 images; LinkedIn uses 1200 × 628, 1200 × 1200 and 720 × 900; ChatGPT ads use a square image up to 1200 × 1200.
Google uploaded display ads
| Group | Sizes (width × height) |
|---|---|
| Square and rectangle | 200 × 200, 240 × 400, 250 × 250, 250 × 360, 300 × 250, 336 × 280, 580 × 400 |
| Skyscraper | 120 × 600, 160 × 600, 300 × 600, 300 × 1050 |
| Leaderboard | 468 × 60, 728 × 90, 930 × 180, 970 × 90, 970 × 250, 980 × 120 |
| Mobile | 300 × 50, 320 × 50, 320 × 100 |
- Images: 150 KB maximum per file.
- Animated GIF: 30 seconds or less in total, slower than 5 frames per second; loops must stop by 30 seconds.
- HTML5: 600 KB or smaller, no more than 40 files in the ZIP.
Responsive display ads
| Asset | Recommended | Minimum | Max file |
|---|---|---|---|
| Landscape image (1.91:1) | 1200 × 628 | 600 × 314 | 5,120 KB |
| Square image | 1200 × 1200 | 300 × 300 | 5,120 KB |
| Square logo | 1200 × 1200 | 128 × 128 | 5,120 KB |
| Landscape logo (4:1) | 1200 × 300 | 512 × 128 | 5,120 KB |
Text: up to five short headlines of 30 characters, one long headline of 90 and up to five descriptions.
LinkedIn and ChatGPT ads
| Placement | Image sizes |
|---|---|
| LinkedIn single image | 1200 × 628, 1200 × 1200, 720 × 900; JPG, PNG or GIF up to 5 MB |
| LinkedIn carousel | 1080 × 1080 per card |
| ChatGPT ads | Square PNG or JPG, up to 1200 × 1200. Image guidance |
Production checklist
- Design the 320 × 50 first; if the message works there, it works everywhere.
- Keep logo and text inside a safe area away from the edges.
- Export every size from one master with the ad image resizer, which flags display files over 150 KB.
- Use JPG or WebP for photos, PNG for flat graphics with text.
- Name files and campaigns consistently with the naming generator.
Questions
What is the max file size for Google display image ads?
150 KB for uploaded image ads. HTML5 ads can be up to 600 KB, with no more than 40 files in the ZIP.
Which display sizes matter most?
300 × 250, 728 × 90, 300 × 600 and 320 × 50 cover most inventory; add 336 × 280, 970 × 250, 160 × 600 and 320 × 100 for more reach.
What sizes do responsive display ads need?
Landscape images at 1200 × 628 (1.91:1) and square at 1200 × 1200, up to 5,120 KB, plus a square logo and optionally a 4:1 logo at 1200 × 300.
What size is a ChatGPT ad image?
A square PNG or JPG, up to 1200 × 1200. Don't design it to look like a chat message; OpenAI requires ads to be distinguishable from ChatGPT itself.
Facts checked against the sources below on 19 October 2026. Ad platforms change quickly: if something here no longer matches what you see, tell us and we will update it.
