Adding pictures to your WordPress website is vital to your design initiative. Without pictures, you may get people to your website, but they're going to be put off by the long text without breaks. There are several factors to consider when you decide to use pictures, including the size, type and amount.
A JPG image is one that is compressed to take up less space on a drive. So if you save it to your computer it's going to be a smaller file than any of the other image types. This can be good if you're trying to conserve space but not as good when it comes to quality. The images will be okay, but if you start to zoom in they'll start to break down and pixelate. With photographs that's all right, but you generally don't want this for other types of images.
A PNG image is considered 'lossless.' What that means is that it compresses without losing any of the original quality. You'll still have all the high quality that you did in the original image, whether it's a photograph or anything else, and you'll have less space being taken up on your computer system.
One of the reasons that you want to watch the number of images you load onto your WordPress website is because they take a lot longer to load than traditional text. If you have a few images that's not a problem because your website should load fast enough that your viewers won't even notice, but if you load your page with images ... well then they're going to notice.
The problem with slow load times is that people will get tired of waiting, and when that happens, you could lose viewers or potential customers. Make sure you're using images to enhance your articles and information, but not using them in place of the information (at least not all of it).
If you're looking to compress images for free then check out the top tools:
Finding the right compression tools and the right saturation of images is going to be the first step, but make sure your images are working for you, not against you. Because too many and too slow of a website is going to slow you down and it's going to turn viewers away.