What this means: PNG or WebP files with a clear background often show those clear areas as black on Etsy. Stickers, cutouts, and digital mockups that float on transparency in Canva can look broken in search tiles and the gallery.
If you ignore it: buyers see a dark block behind the product. You may think the listing is fine in admin while the public page looks wrong — and you burn time on re-uploads.
How I fix it: I flatten onto white, cream, or another light solid that matches the shop, then export JPEG (sRGB, no transparency), under about 1MB when I can. The size I reuse often is 2700×2025 (4:3) with no transparent background — same habit as Rule 10 on the rules hub.
TagPeek’s local checker can flag transparency before upload. After publish I still glance at the live page — black-background surprises are common enough that I keep this note here.
这条要求什么：带透明底的 PNG / WebP，透明处在 Etsy 上经常变成黑色。贴纸、抠图、数码样机在 Canva 里看着飘在透明上，搜索格子和首图库里却可能整块发黑。
不过会怎样：买家看到商品后面是一块黑。你在后台觉得没事，公开页却很怪 —— 再重传又花时间。
怎么修：我先铺白、米色或店铺同款浅色实底，再导出 JPEG（sRGB、无透明），尽量控制在约 1MB 内。常用 2700×2025（4:3）且不要透明背景 —— 和规则列表里的 规则 10 同一习惯。
TagPeek 本地检测能在上传前标出透明。发布后我仍会扫一眼线上页 —— 黑底事故够常见，所以留了这条。
Read Etsy Help original ↗看 Etsy 官方原文 ↗ · Black-fill habit from seller experience; flatten before upload. · 黑底现象来自卖家常见经历；上传前先铺实底。