Thumbor

The service runs as an HTTP server that creates transformed images on the fly based on URL parameters, supporting operations such as cropping, resizing, flipping, and applying a range of filters. It includes AI‑driven detection of faces and other salient features to produce smart crops that keep important subjects in view, and it can output WebP and other formats to reduce file size.

Developers can integrate it with existing storage back‑ends through built‑in loaders and storages for file systems, HTTP, Redis, and MongoDB, or implement custom ones. Filters for brightness, contrast, grayscale, red‑eye removal, blur and others can be chained, and the platform is extensible for additional processing steps.

The project is self‑hostable, released under the MIT license, and distributed as a Python package, OS package, or Docker image. It is used by many companies for on‑demand image handling, offering a stable, open‑source solution that separates image processing from storage and delivery.