Image optimization is about reducing the file size of your images as much as possible without sacrificing quality so that your page load times remain low. It’s also about image SEO. That is, getting your product images and decorative images to rank on Google and other image search engines.
Images can be used strategically for ranking. Properly considered, images can rank in position zero. Images can also rank in image search and lead to more visitors. Images can also help search engines understand what your content is about.
1.Serve images in the correct formats:
Image file size can affect page load time so it’s important to get it right. JPEGs are usually more SEO-friendly than PNGs, especially if you do not need transparent backgrounds, as they offer better compression levels.
Logos and other high-resolution, computer-generated graphics can typically also use the vector-based SVG file format (make sure that your server caches, minifies, and compresses that format as well).
2.In Google PSI, Serve Images in Next-Gen Formats:
JPEG 2000, JPEG XR, and WebP are image formats that have superior compression and quality characteristics compared to their older JPEG and PNG counterparts. Encoding your images in these formats rather than JPEG or PNG means that they will load faster and consume less cellular data.
The next step in image SEO should be to make sure that scaled image is compressed so it is served in the smallest file size possible. By using free online tools like “lunapics” images can be optimized and reduced without losing the quality and resolution.
Image relevancy is important when it comes to image optimization for SEO. An image of a train on a page related to Ferrari will do you no good. I know its common sense but this step is so important that I just can’t miss it out.
The Alt tag is probably the most important image optimization factor. Alt stands for alternate. The text in the alt tag is displayed in place of the image if the image cannot be shown or is taking too long to load.
The alt tag not only tells the search engines that there is an image placed here but also informs it about the topic of your image. This helps in image relevancy of that particular image, also this tag can be used in putting keywords which will lead to good ranking in image search.