Flyimg

Flyimg is an open-source, self-hosted application that provides on-the-fly image optimization. It allows users to resize, crop, and compress images by passing a source URL and a set of transformation keys through a web request. The software is deployed as a Dockerized service, combining nginx and php-fpm to handle requests and process images. It functions as a dedicated image processing server that can be integrated into various web workflows to automate the delivery of optimized assets.

The application fetches images from a specified source, applies the requested transformations, and stores the result in a local cache. Subsequent requests for the same image and parameters are served directly from the cache to reduce processing overhead and latency. This mechanism ensures that the server does not need to re-process the same image multiple times. It is designed for developers and system administrators who require a centralized way to manage image assets for websites or applications without manually creating multiple versions of every file.

Key features

• Automatic generation of AVIF and WebP formats
• Support for MozJPEG compression
• Image resizing and cropping via URL parameters
• Support for PNG, GIF, and JPEG XL output
• Content negotiation using the Accept header
• Local caching of processed images
• Configurable transformation separators
• Docker-based deployment

Flyimg utilizes ImageMagick for its processing capabilities and supports various output formats depending on the configuration. Users can customize the service behavior by modifying a parameters.yml file and mounting it as a volume in the Docker container. The architecture is built to handle both relative and absolute image paths, making it flexible for different hosting environments. The system supports fine-tuning of encoder effort for specific formats, such as JPEG XL, allowing for a balance between compression quality and processing time.

This software is a utility for infrastructure management and image optimization.