You convert a product cut-out from PNG to JPG and the transparent background comes out black. It’s one of the most common image problems sellers hit, and it has a simple cause.
Why the background turns black
PNG can store transparency; JPG cannot. Every pixel in a JPG must have a colour. When a converter meets a transparent pixel, it has to choose one — and many simply use black, because a fully transparent pixel is often stored with black colour values underneath. The result is a product floating on black.
The fix: fill transparency with white
A good converter fills transparent areas with a colour you choose before encoding the JPG. For product photos that colour should almost always be white, which turns a cut-out PNG into exactly the white-background image marketplaces want. Our image converter fills transparency with white automatically when converting to JPG.
Step by step
- Open the image converter and add your PNGs.
- Choose JPG.
- Set quality to around 85–90% for product photos.
- Convert and download. Transparent areas are now white.
Check the edges
Cut-outs made by background-removal tools sometimes leave a faint halo of semi-transparent pixels around the product. On white these usually blend in. If you see a grey or dark fringe, the original cut-out included some of the old background; fix it in the cut-out, not the conversion.
Converting WebP to JPG
Many websites now serve images as WebP, so a saved image often arrives as .webp. If an upload form rejects it, the same process applies: convert to JPG, and any transparency becomes white.
When to keep the PNG
If you genuinely need transparency — a logo to place over different backgrounds, for example — keep the PNG, or use WebP. Convert to JPG only when the destination needs a JPG or a solid background.
Try it: Convert PNG to JPG with a white background — free, no signup, runs in your browser.
Related: JPG vs PNG vs WebP for product photos.