Prepare a 1200×1500 portrait ad
Create a 1200×1500 image with a 4:5 aspect ratio. Google lists this as the recommended portrait size for App campaign image assets.
The resizer standardizes pixel dimensions and preserves the source format. It does not validate campaign text, policy, or file-size limits.
Portrait cover crop
Cover mode fills the entire frame without stretching. A wide source loses a substantial amount from the left and right, so start with portrait artwork when possible.
Keep the subject, logo, and text near the center. Responsive placements can crop an uploaded asset again, making edge content risky.
Build a campaign set
Process several creatives with the same portrait dimensions, then pair them with square and landscape exports. Google recommends supplying multiple aspect orientations so its placements have suitable source material.