You can use a TikTok video downloader, which is a tool or application that allows you to save TikTok videos directly to your device for offline viewing or sharing. These downloaders typically work by copying the video URL from TikTok and pasting it into the downloader's interface. The downloader then retrieves the video file and saves it to your device's storage. However, it's important to use these downloaders responsibly and respect the rights of content creators and the platform's terms of service. Additionally, ensure that you choose a reputable downloader to avoid any potential security risks.