What is a transparent background?

Your PNG is not transparent because the checkerboard was saved into it as gray and white pixels, because it was saved as a JPEG along the way (a JPEG renamed to .png still has no alpha channel), or because the export had transparency turned off and dropped the alpha channel. Some file browsers and previews also draw transparent pixels as white, so the file may be fine. Test it on a colored background: if white or a checkerboard still shows, the pixels are real.

Place it on a colored background in any editor or slide app. If the color shows through, it is transparent; if you see white or a gray checkerboard, those are ordinary pixels.

The file is a JPEG, or a PNG that was flattened: both store white pixels where the transparency was. Export the logo again as a PNG with transparency on, or run it through a background remover and download the PNG.

A transparent PNG shows a black background when the app or site displaying it doesn’t support transparency and flattens the empty pixels onto black. Many marketplaces and some phone galleries do this. The file is fine; upload a version of the picture on white where transparency isn’t supported, which DreamBench’s white background maker makes in one step.

Either the edge pixels still carry color from the old background, or an app mixed straight and premultiplied alpha. Re-export from the cutout on a transparent layer, and check the file in the viewer you’ll actually use.

No. JPEG has no alpha channel, so a transparent area is filled with a solid color when the file is saved. Use PNG or WebP to keep transparency.

It is the part of an image file that stores how opaque each pixel is, from fully transparent to fully opaque. With an alpha channel, soft edges such as hair can stay partly see-through.

Remove the background with a matting tool, then save the result as a PNG or WebP. A JPEG can’t keep it, so check the file type before you save.

A transparent PNG has jagged edges when each pixel along the edge is either fully shown or fully hidden, with no partial values in between. A GIF works that way, since it can only mark one color transparent, and so does a cutout made by segmentation alone rather than matting. A matting model keeps a partial value at the edge, which is what DreamBench’s maker does; save the result as PNG or WebP, which keep those values, not as GIF.

Usually, yes: a PNG compresses without loss and stores a fourth value for every pixel, so a PNG of a photo is larger than a JPEG of the same picture. A cutout on transparency is the exception that compresses well, because the transparent area is all the same value. WebP keeps the alpha channel at a smaller size for the web; convert the PNG in your editor when a site asks for one.

Yes, for pictures you have the rights to. Under the DreamBench Terms you may use what a tool makes for personal and commercial purposes, including advertising, monetized content and work for clients, with no separate commercial-use upgrade. The Terms don’t guarantee copyright in a result or clear another person’s rights in your upload, so a cutout of someone else’s photo, logo or character is theirs to license, not yours.