If you're looking for a general-purpose tool to edit and improve anime and cartoon imagery, cre8tiveAI is worth a look. The AI-powered service has a range of anime art tools, including Anime Art Painter and Moving Photo Maker, but also has a more accessible interface for people who aren't designers. It also can upscale images, smooth out faces, and perform other tasks.
Another good choice is Anime Art Studio, a free web-based service that offers more than 100 diffusion anime models you can use to generate different anime images, voices, videos and animations. It's got tools like Img Enhancer for upscaling and improving images and Best TTS for generating voices, so it's a good all-purpose option for anime fans.
If you're looking for more advanced processing, Let's Enhance has a more serious image upscaling and enhancement service, including support for 4K and higher resolutions. It can also batch-process images, apply HDR filters and remove backgrounds, so it's good for creative pros and businesses that need high-end imagery fast.
If you want a tool that specializes in turning photos into cartoons, Cartoonify offers a free, easy-to-use interface to cartoonize photos on the fly. Its AI technology is geared for both beginners and experienced artists, with unlimited access to customization options and fast processing for creating attention-grabbing illustrations and portraits.