Website Image Extensions

.gif
Graphics Interchange Format
The GIF format (.gif file extension) is one of the two most common file formats for images on the World Wide Web, since it is supported by almost all Web browsers. Because this format can only display a maximum of 256 colors, it is best used for black-and-white line drawings, color clip art, and pictures with large blocks of solid colors. The GIF89a format also supports both transparency and animation.

.jpg   or   .jpeg
Joint Photographic Experts Group
The JPEG format (.jpg or .jpeg file extension) is the other most common file format for images on the Web. It is not limited to 256 colors, so you can use it to display high-quality photographs, or pictures containing millions of colors. Because it is designed as an image storage format, it can efficiently compress large, high-quality photos into very compact files, so it is very useful when you want to send a large image via e-mail. However, the more you reduce your image's file size (or modify and re-save the image), the more image information is discarded - and quality is decreased. Moreover, this format does not support transparency or animation.

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