Choose a video collage app or editor
Gather the video clips you want to use
Import the clips into the editor
Select a collage or split-screen layout
Arrange the clips in each frame
Trim each clip to the desired length
Resize or crop clips if needed
Add transitions if available
Add music or audio if desired
Adjust volume levels
Add text, stickers, or filters if needed
Preview the collage
Make final edits
Export the finished video collage