Kwai Downloader is the best app for downloading HD videos without a watermark from Kwai/Snack. It's totally free, super fast, and easy to use. All you need to do is copy the link or share the link of the video you want to download, and then your download task will automatically start.

Just install the app, and it's ready to go. You don't need to log in; you don't have to create an account; you don't need to give your phone number. You don't need to do anything else. The app will just start downloading.

The downloaded videos will be saved to your device, so you can access them even if you are offline.