PNG is generally the best format to use
- JPEG
- JPG files are best for photographs or artwork with gradient tints because they support thousands of colours. JPG files are easily compressed but drop photo quality easily,
- GIF
- GIF images are best for line art or artwork with flat areas of colour such as text rendered as an image.
- GIF images are compressed by removing colours from its palette of 256.
- GIF images support transparency.
- GIF is an older file format that is being superseded by PNGs.
- PNG
- PNGs provide all the advantages of GIFs with a greater colour range support
- They compress much better than GIFs
- PNG images support transparency