imgproxy

imgproxy is a standalone HTTP image processing server that resizes, transforms, optimizes, and converts images on the fly. It fetches source images (typically by URL), applies requested transformations, and returns the resulting image, offloading image processing from your application.

Key Features

• URL-based image transformations (resize, crop, rotate, and more)
• Image optimization features such as metadata and color profile stripping
• Supports multiple formats including JPEG, PNG, GIF, WebP, AVIF, and JPEG XL
• Watermarking and filters for common presentation needs
• Security controls such as signed URLs, source restrictions, and size/dimension limits to mitigate abuse and “image bomb” attacks
• Designed for high performance using libvips

Use Cases

• Delivering responsive images and thumbnails for web apps without pre-generating variants
• Converting and optimizing images to modern formats to improve page performance
• Centralizing image transformation logic behind a CDN or reverse proxy

Limitations and Considerations

• Typically deployed behind a CDN, load balancer, or reverse proxy for HTTPS termination and caching
• Some advanced capabilities are available only in the separate Pro edition

imgproxy fits well when you want predictable, controlled image processing on your own infrastructure while keeping application code simple. It is especially useful for high-traffic sites that need fast, secure, on-demand image transformations.