In the video ‘How To Use Stable Diffusion Online | Not Google Co’ by Planet Ai, the presenter demonstrates how to use Stable Diffusion online without the need for high-end GPUs. The video introduces Mimic PC, a platform that allows users to run various Stable Diffusion-based applications such as automatic 1111, comfyUI, and Focus AI online for free. The presenter walks through the process of accessing these tools, selecting models, and generating images. The video shows how to use automatic 1111 to generate images and how to install new models from Civit AI by copying and pasting the model URL into the Mimic PC interface. The presenter also demonstrates generating images with different prompts and adjusting settings like sampling steps and methods. The video highlights the flexibility of using Mimic PC, including the ability to try other interfaces like comfyUI and invoke AI. The free plan provides one hour of usage, with additional hours available for purchase. The video concludes by recommending Mimic PC for those who want to learn Stable Diffusion without investing in expensive hardware.