If you want a tool to generate high-quality images fast, getimg.ai is a top contender. The AI-based service offers a variety of tools to generate new images from text prompts, edit existing images and create your own AI models. It's got an AI Generator, Image to Video converter, and AI Canvas to expand images. It can generate high-resolution images, and it offers a variety of pricing tiers depending on your needs.
Another option is Leonardo, geared for creators and teams that need high-quality assets all the time. Leonardo offers tools to generate images, 3D textures and fine-tuned AI models for different styles. It also offers a free tier and paid subscriptions, so you can use it depending on your needs.
If you want to upscale and otherwise improve images, Let's Enhance is a good option. It can upscale and improve blurry images to 4K and beyond, batch edit images, and apply HDR filters. It's good for creative pros, eCommerce and real estate, and offers a free trial and credit-based pricing.