Top Alternatives to Caesium

PhotoBulk is a powerful yet simple bulk image editor for macOS. It allows users to perform multiple editing operations on hundreds or thousands of images simultaneously, including watermarking, optimization, resizing, and renaming, all through an intuitive drag-and-drop interface.

RIOT (Radical Image Optimization Tool) is a lightweight and free image optimizer designed for effortless image compression and batch processing.

FastStone Photo Resizer is a free batch image converter and renaming tool designed for efficiency. It handles various image formats and offers essential editing functions like resizing, cropping, watermarking, and color adjustments in a batch process.

Light Image Resizer is a comprehensive yet easy-to-use application for resizing, converting, protecting, and organizing your digital photos and images. It supports batch processing, allowing you to optimize large collections quickly.

PngOptimizer is a lightweight and portable utility designed to optimize PNG images by removing unnecessary metadata and data chunks, resulting in smaller file sizes without compromising image quality. It supports drag-and-drop functionality for ease of use.

ImBatch is a robust and free batch image processing tool for Windows. It allows users to apply multiple image editing tasks simultaneously to large collections of photos, streamlining workflows and saving significant time.