Enable Image Resizing
To use Image Resizing you first need to enable it via the Speed app on your Cloudflare dashboard:
- Log in to the Cloudflare dashboard and select your account.
- Go to Speed > Optimization.
- Under Image Optimization, enable Image Resizing.
- If you do not want to resize images from any origin, uncheck Resize images from any origin. When unchecked, Image Resizing only resizes images in the enabled zone and prevents third-parties from resizing any image at any origin.
 Usage-based notifications
Since this is a service with usage-based billing, Cloudflare recommends that you set up usage-based billing notifications to avoid unexpected bills.
To set up those notifications:
- Log in to the Cloudflare dashboard. 
- Select your account. 
- Go to Notifications. 
- On Alert Type of Usage Based Billing, click Select. 
- Fill out the following information: - Name
- Product
- Notification limit (exact metric will vary based on product)
- Notification email
 
- Select Save.