Use the right image file format

Commonly used image file types

• JPEG – lossy compressed file format, usually the smallest file size; ideal for photos
• PNG – usually larger file size than JPEGs; ideal for line drawings, screenshots, images that contain text or transparent backgrounds
• GIF – limited colors; ideal for animated images
• SVG – scalable format (it doesn’t pixelate), usually smaller; great for logos, icons, simple illustrations

Besides these, there are next-gen image formats like WebP, JPEG 2000, and JPEG XR.

WebP, was developed by Google for the purposes of serving high-quality images in smaller sizes.