What happens
A logo or cut-out with a transparent background comes back with a solid white — or sometimes black — background.
Why it happens
JPEG has no way to store transparency. Every pixel in a JPEG is a solid colour, so when an image is saved as JPEG, the transparent areas have to be filled with something. The tools here fill them with white. A program that ignores transparency altogether shows the same areas as black.
PNG and WebP can store transparency, as can AVIF where your browser can write it.
What to do
- Save as PNG or WebP. In the Image Format Converter and any tool with a format choice, pick PNG or WebP instead of JPEG.
- Start from the original. Once an image has been saved as JPEG, the transparency is gone for good. Go back to the PNG you started with.
- Need a JPEG anyway? Then choose the background on purpose: put the image on the colour of the page it will sit on, so the filled area blends in.