Fill transparent image backgrounds with a solid color or a two-color gradient. The tool keeps the image dimensions the same and changes only what appears behind transparent pixels.
Use it when transparent pixels already exist and need a visible background. It is not a background remover, object detector, or cutout tool.
Fill existing transparency
PNG and WebP files can contain transparent pixels. Image Background Filler paints behind those pixels, then draws the original image on top.
If the source is JPEG, there is no transparency to fill. The export is still flattened because JPEG files are already opaque.
Solid color or gradient
Solid mode fills transparency with one color. Use it for logos, product cutouts, icons, and assets that need to sit on white, black, or a brand color.
Gradient mode creates a linear background from one color to another. Direction options include top to bottom, left to right, and two diagonals.
Per-image backgrounds
Global settings apply to every image in the batch. Click Edit on a card when one file needs a different color, gradient, or direction.
Use the modal preview before downloading if the transparent edge has anti-aliasing. Semi-transparent pixels can pick up the background color at the edge.
What it does not do
The filler does not cut subjects out of photos, detect objects, erase backgrounds, or resize the canvas. If the image has an unwanted opaque background, fill controls cannot make it transparent.
Use a canvas or padding tool when the task is to add space around the image instead of filling existing transparent pixels.