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Image Resizing after Upload with Amazon S3, AWS Lambda and CloudFront for SSL for SSL is important for many reasons. Creating several thumbnails during image upload, can be a lot of workand limits the agility for future redesigns. Instead of processing and resizing images into all necessary sizes upon upload, the approach of processing images on the fly has several upsides: Increased agility Reduced storage costs, Reduced failure to failure, Reduced storage and Resilience to failure. We'll be using a different approach and outline a method of lazily generating images, in which a resized asset is only created if a user requests that specific size.