Without watermark — no app install required
Open the TikTok app on your Android phone and find the video you want to download.
Tap the Share button (arrow icon) on the right side of the video.
In the share menu, tap "Copy Link" to copy the video URL to your clipboard.
Open your browser and go to TikDown Pro. Tap the input box.
Tap the "Paste" button or long-press to paste the URL, then tap the Download button.
Tap "Download MP4 (No Watermark)". The video will save to your Downloads folder.
The downloaded video will be in your browser's Downloads folder. Open the Files app to find and move it to your Gallery.