The Trade Desk DOOH Billboard 840x400 Ad Size
840×400px · 21:10
The recommended size for The Trade Desk DOOH Billboard 840x400 ads is 840×400px (ratio 21:10). Accepted file format: PNG, with a maximum file size of 750KB.
Placement spec
| Recommended size | 840×400px |
|---|---|
| Aspect ratio | 21:10 |
| File format | PNG |
| Max file size | 750KB |
Frequently asked questions
What is the correct size for The Trade Desk DOOH Billboard 840x400 ads?
The recommended size is 840×400px with a 21:10 aspect ratio.
What are the file format and size limits?
Accepted file format: PNG, with a maximum file size of 750KB.
Can I convert an existing banner to this size automatically?
Upload your original banner to ImageFactory banner resize and it is automatically converted to 840×400px and 1,400+ other placement sizes. For placements with a safe zone, AI keeps key elements inside the safe area.