Why transparent images turn white or black after conversion

The missing color behind a transparent pixel

An image can have color information and an alpha channel, which tells the viewer how opaque each pixel should appear. A logo with a transparent edge may look correct over a light website and a dark slide because the background shows through. JPG does not store an alpha channel. When you convert that logo to JPG, every transparent pixel needs a real color. Our JPG converter uses white, making the result predictable for documents and many marketplaces.

PNG and WebP can store transparency. If your downloaded PNG looks white in a file browser, check it over a checkerboard or place it over a colored background: some viewers simply display transparent pixels on white. A logo with a white background in its source is different. Conversion cannot automatically identify which white pixels were meant to be transparent.

A reliable export check

1. Open the source over a contrasting background and identify whether it actually has transparent pixels.
2. Use Convert to PNG for a still output that preserves alpha where the browser can decode it.
3. Open the downloaded file over both dark and light backgrounds. Inspect soft edges, shadows and small lettering.
4. If the image is going to a system that only accepts JPG, choose a deliberate solid background first rather than hoping transparency will survive.

Canvas export rewrites pixels. It will not keep layers, vector paths or animation. Anti-aliased edges may have colors blended for an old background, creating a light halo when placed elsewhere. For a professional logo, return to the original design file and export with clean alpha at the intended resolution. A PNG is not always smaller than a JPEG or WebP, particularly for photos; compare actual file sizes before publishing.