Runway offers powerful AI editing tools that go beyond generation to enhance and modify existing video.

Video Inpainting

Remove or replace elements in existing video:

1. Upload a video
2. Mask the area you want to change (brush or automatic selection)
3. Optionally describe what should replace it
4. Runway regenerates the masked area seamlessly across all frames

Use cases:

• Remove unwanted objects or people from footage
• Replace backgrounds in video clips
• Remove watermarks or logos
• Clean up visual distractions

Green Screen (Background Removal)

AI-powered background removal for video:

• No physical green screen needed
• Works on existing footage
• Clean edges even with complex subjects (hair, transparent objects)
• Replace with any background — solid color, image, or generated scene

Video Extend

Extend a generated or existing video clip:

• Add more frames to the end
• Maintains consistency with the original
• Chain multiple extensions for longer sequences
• Useful for creating 30-60 second clips from initial generations

Super Slow Motion

AI-powered frame interpolation:

• Create smooth slow-motion from standard footage
• Generates intermediate frames that don't exist in the original
• Works at up to 4x slow-motion
• Natural-looking results without the stuttering of simple frame duplication

Other Tools

• Image to Image — Style transfer and image transformation
• Text to Image — Generate images (useful for image-to-video pipeline)
• Backdrop Remix — Replace backgrounds in photos
• Frame Interpolation — Smooth out low-framerate video