PNGs can be saved as Grayscale, Truecolor, Indexed-color, Grayscale with alpha, and Truecolor with alpha. One of the most basic ways to cut down on a PNG's file size is to limit the number of colors that the image has. The good news is that there are a variety of methods and tools that can reduce the size of PNG files by anywhere from 10 to 80 percent depending on the tool and the image in question. Some image editors don't automatically reduce PNG file size for you, so you'll like need to make use of an optimization tool / service to reduce the image file size. When you're using them on a website or in an app, PNG files that haven't been optimized can dramatically increase load times.

In some cases, just adding a few pixels of additional width to a PNG file can double the file size. There is one major downside to PNG files, and it is that the file size of this type of image can get large quite quickly. If you're unsure what the difference is between PNG and JPG files, consider reading our PNG vs JPG Images post. The ability to take advantage of transparency and lossless encoding make them a popular choice for web designers and web developers they are one of the most commonly used image file formats on the web along with JPG. With PNG files, you have the ability to take advantage of transparency, you can animate them, and you are able to save them without loss of color or quality.

This can dramatically degrade the quality of the final output image since monitors are able to show upwards of 16.7 million colors. While GIF files are able to provide transparency, they're also limited to 256 colors.

PNG files are a high quality alternative to GIF files.

Why is my gif file size reducer