One of the best is ImagetoCartoon, a web-based tool that uses 2D and 3D cartoonization technology to turn your photos into cartoon avatars and characters. It's got an automated process that requires no manual input, takes a few seconds to produce results and comes with a variety of themes like business, career and superheroes. ImagetoCartoon is good for casual use, and you can try it with a free trial that comes with a monthly allotment of credits.
Another good option is Cartoonify, which uses AI to turn your photos into cartoons with a single click. The service is easy to use, good for both beginners and more advanced artists, and offers fast and efficient processing, along with unlimited customization options for free. That makes it good for colorful and whimsical portraits and illustrations.
If you prefer mobile apps, Pho.to offers a collection of tools that can turn your photos into cartoon portraits with AI technology. The collection includes ToonMe, which can create cartoon and vector portraits, and other apps for editing photos and retouching faces. That makes Pho.to a good option for a broad range of people, from casual to serious.