ImageKit.io - Instant multi-platform image optimization
Compressnow - Compressnow is a web service used for compressing the image to be used for different purposes in the websites or promoting the products as this is a problem for both web developers and end-users.
Promo.com - Every promotion starts with Promo.com.
GiftOfSpeed - How fast is your website from different parts in the world? Get a free detailed speed report, including fixable performance issues.
Promo Instant Image Resizer - Automatically optimize images for web & social media (free!)
Geekersoft Free Online Image Compressor - With this online image compression tool, you can quickly compress photos in JPEG, JPG, PNG, GIF and other formats and export high-definition images.