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After you upload this PNG file to Google background, it will loop as an animated GIF. Well, the tricky thing is that to upload an animated GIF as a Google background, you need to manually change a GIF format to a PNG format. You might be wondering why it’s not the GIF file format. Now, It’s Your Move Google Background GIF: Aspect Ratio, Format, and File Size Format: PNG

If you want to closely examine any one of the GIF frames, you can disable the animation and specify the frame number you're interested in. In the options, you can also find a section about GIF frame delays, frame sizes, and frame counts. The "Animation Preview" option lets you see the input GIF with the original background and the output GIF with the removed background. This option works only in the browser and illuminates the removal areas using black and white pixels. To see exactly which pixels will be removed and which will remain, you can use the "Alpha Channel Preview" option. For example, the percentage 0% means match just one color and 20% means match 20% of similar color tonality. In this option, you can specify the percentage from 0% to 100%. If the background of your animation has various shades of the same color, you can remove them as well via the shade matching option. Similarly, if you enter a mathematical color value "#0000ff", the program will remove all blue pixels. For example, if you enter the color "yellow", the program will remove the yellow background from the animation.

The area that will be removed from the GIF is selected by matching the specified color in pixels of the frames. When the background is deleted, you can download the transparent GIF right away. If your GIF has a single frame (it's static), then it deletes the background from just this one frame.

If your GIF is multi-frame (it's animated), then it loops over all frames and deletes the background from every frame. This is a browser-based program that deletes the background color from all GIF frames.