1 credit = 1 image or thumbnail #
A credit is used each time ShortPixel Image Optimizer (SPIO) optimizes an image or thumbnail by at least 5%. If an image or thumbnail cannot be optimized by at least 5%, no credits will be deducted.
When you upload an image, WordPress automatically generates several thumbnails based on your theme and plugins. Each thumbnail optimization counts as a separate credit. However, you can exclude specific thumbnails from optimization to reduce the number of credits used.
Additionally, if you choose to create WebP or AVIF versions, an extra credit is required for each image and thumbnail that gets a WebP/AVIF counterpart.
Example #
Suppose you upload an image, and WordPress generates 8 thumbnails. You also choose to create WebP versions for both the original image and its thumbnails.
- Original image optimization: 1 credit
- 8 thumbnails optimization: 8 credits
- WebP creation for the original file + the thumbnails: 9 credits
- Total: 18 credits
Learn more about how ShortPixel credits work.
CDN #
Starting with version 6, SPIO offers the option to deliver images via ShortPixel’s CDN. If you enable this feature, one credit will be deducted for every 5 MB of CDN traffic used.
Unlimited plan #
With the Unlimited plan, credit usage becomes irrelevant. You can optimize as many images as you want, and you’ll also receive 500 GB of CDN traffic to use with the ShortPixel CDN delivery option.