Can I remove backgrounds from many images at once?
On the website, images are processed one at a time with no limit on how many you run back to back. For true bulk, the developer API accepts batches of 50 image URLs per call, async jobs up to 50 MP, and callbacks when each result is ready.
Shops with a few dozen products are usually fastest just running the web tool image after image. Above that, a script against the API is the honest answer — the bulk guide shows the pattern, and there are worked examples for Shopify, WooCommerce and Google Sheets.
API pricing is one credit per full-resolution image — $9 for 100, $39 for 500, $129 for 2,000 — with free preview-size results and no subscription.