Some of the tiktok videos or accounts are private and some videos are geographically restricted by the owner. We cannot access these tiktok videos, thus they cannot be downloaded.
When you left click on the download link it is normal the browser starts to play tiktok video. You need to right click on download link and choose "save as" to save the tiktok video.
On a PC, they are usually saved under "Downloads" folder. On IOS and android devices you can save tiktok videos to browser download folder or directly to Photos app.
Most of the tiktok videos we serve are in HD or Full HD format. This means that you can download highest quality tiktok videos including 1080p tiktok videos and 720p tiktok videos.
Most of the tiktok videos are already in mp4 format, we automatically convert and serve tiktok to mp4 instantly if they are in different formats. You don't have to manually convert tiktok videos to download in mp4