Flyimg generates every image size a website needs at request time, turning one original into resized, cropped, and compressed variants through a simple URL. Append options like width, height, crop, and quality to a request, and the service fetches the source image, transforms it, and serves the result, storing it in cache so the next request is answered instantly. Output defaults to AVIF for browsers that support it, with WebP and MozJPEG compression available for lean JPEG delivery, plus PNG and GIF when the source calls for them. Signed URLs keep strangers from using your server as a free image proxy, and domain restrictions limit which sources the service will fetch from. One Docker container gives a website or application a complete image pipeline: originals stay in whatever storage already holds them, and every thumbnail, banner, and product shot is produced at request time in exactly the dimensions the layout needs. Cache headers and repeat serving keep bandwidth costs predictable as traffic grows. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.