The nice things about this website are
- It's free!
- You don't need to create any account. Just upload and choose your image
- You can download the image after it is cartoonized. There is a little watermark "cartoonized.net" on the bottom right corner. But you can crop it out.
There is a desktop version for $19.95, where you can convert your images in batch, and you can do it offline. To me, I think it's expensive because I'm a casual user. For now, online conversion is all I need.