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<img src=”July-2021-CDA-Journal-Publication.png” alt=”July 2021 CDA Journal Publication.png”>
The number one priority when it comes to image optimization is to fill out each alt attribute for each product image on your site.
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As you can see, JPEG is the clear winner here. GIFs and PNGs must degrade in quality in order to remain at the same low file size.
Here are some tips to remember when choosing file types:
In most cases in ecommerce, JPEGs will be your best bet. They provide the best quality for the smallest file size.
Never use GIFs for large product images. The file size will be very large and there is no good way to reduce it. Use GIFs for thumbnails and decorative images only.
PNGs can be a good alternative to both JPEGs and GIFS. If you are only able to get product photos in PNG format, try using PNG-8 over PNG-24. PNGs excel as simple decorative images because of their extremely small file size.
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