ImgFiber is introduced as a new image optimization tool that emphasizes being free with no usage limits. However, there are discussions regarding the accuracy of labeling its compression as 'lossless'. Comments highlight that while ImgFiber reduces file sizes, it may involve quality degradation; therefore, could be characterized as 'near lossless'. Users compare it to other tools like Squoosh.app, which is praised for being open-source and offering on-device processing with detailed control over various parameters. Additionally, interest in algorithmic techniques used in image optimization prompts discussions about the technologies underpinning ImgFiber, with users curious about potential library dependencies or proprietary methods.