Download a TikTok thumbnail on computer
On Android, copy a TikTok video, Story, or slideshow link, then open the TikTok thumbnail downloader in Chrome or your default browser.
Copy thumbnail link
Open TikTok, tap Share → Copy link on the video.
Paste thumbnail link
Paste in TikNoMark and tap Download thumbnail.
Save the file
Save the thumbnail as JPG to your device.