viva is a free ai generation tool and community, there are text-to-image, image-to-image, text-to-video, image-to-video and other generation functions, as well as powerful ai editing tools, you can expand image, repainting anything, and make the images and videos to become more high-quality and 4k. the most critical thing is that all of these are free of charge, viva makes the ai creation simpler and more efficient.