Walmart shoppers expect fast pages and zoomable gallery images. Normalize a batch to the recommended square frame, compress for weight limits, then ZIP before you push updates in Seller Center.
Follow the Walmart catalog workflow (upload → resize → compress → checks → ZIP), then apply the Walmart Product preset and Seller Center rules.
In Bulk Resize, pick Walmart Product (2200×2200). More context: Walmart image resizer.
Then run Bulk Compress. If uploads fail, see wrong listing image size and batch vs one-file compressors.
All channels: Platform solutions hub.