Open TikTok and tap the plus button
Record a video or upload one from your gallery
Tap Effects or Filters
Select a dark or black background effect if available
Use a black backdrop when filming for a full black background
Go to Edit and choose a background or canvas option if your version has it
Use a green screen effect and replace the background with a black image
Add a black image as the background in CapCut or another editor, then upload to TikTok
Save and post the video once the background is black