0 / 5000
Reference image to influence the style or content of the output.
Seed unlocked - will use random seed
AI Video Editor — Edit Videos Online with Runway AI
Edit existing videos with natural language — no re-shooting, no manual compositing. AI Model's AI video editor is powered by Runway, the AI company whose tools were used in the Oscar-winning Everything Everywhere All at Once and a Lionsgate production partner. Upload a clip, describe the transformation in plain English, and generate an edited version that preserves your original motion, camera work, and scene coherence. Runway's in-context editing engine analyzes your footage's lighting, depth, spatial relationships, and object interactions — then applies your changes frame by frame while maintaining temporal consistency. From object removal to full environment swaps, every edit respects the physics of your original scene.
What is Runway AI Video Editing?
Runway AI video editing uses an in-context video model that understands existing footage before modifying it. Unlike text-to-video generators that create content from scratch, this AI video editor takes your uploaded clip as input and applies targeted transformations. The model analyzes lighting conditions and direction, spatial depth and object relationships, and physical interactions within your scene — then adjusts shadows, reflections, and perspective automatically to keep edits visually coherent.
The editor supports 12 distinct editing capabilities: camera angle generation, shot continuation, motion transfer, relighting, environment swaps, object manipulation, character editing, background isolation, recoloring, style transfer, VFX generation, and content repurposing. Runway is used by film studios (Lionsgate partnership covering 20,000+ titles), advertising agencies, and content creators — cutting VFX production time from days to minutes. In the Turing Reel blind study (1,043 participants), only 9.5% could reliably distinguish Runway-edited footage from real video.
Runway AI Editing Capabilities
Twelve editing tools built on Runway's in-context video understanding — each preserving your original motion and scene coherence.
Camera & Shot Generation
Generate entirely new camera angles from a single input clip — reverse shots, over-the-shoulder views, low angles, and aerial perspectives. Runway's 3D geometry reconstruction creates novel viewpoints that match your original scene's lighting and depth. Extend shots or transfer motion from one clip to animate a still image.
- Novel viewpoint generation via 3D reconstruction
- Shot continuation with matched motion and lighting
- Motion transfer from video to static images
Object Manipulation
Add, remove, or replace any element within your scene. Runway AI matches lighting direction, shadow behavior, and perspective automatically — inserted objects cast correct shadows, and removed objects leave clean backgrounds. Extract subjects from complex scenes without a green screen.
- Physics-aware object insertion with shadow matching
- Clean object removal and background reconstruction
- Object replacement with matched perspective
- Green-screen-free subject extraction
Environment & Atmosphere
Swap locations, change seasons, add weather effects, and shift time of day — all without leaving your desk. Turn a sunny exterior into a snowstorm, shift noon light to golden hour, or add rain with proper reflections on surfaces. The online video editor preserves subject motion and camera trajectory through every environmental change.
- Location and environment transformation
- Dynamic weather effects with surface interaction
- Time-of-day relighting (dawn, golden hour, night)
Visual Style & VFX
Apply artistic style transfers, generate integrated VFX, and adjust color grading across your entire clip. Use reference images to lock in a specific look — film noir, watercolor, cyberpunk neon — while preserving motion fidelity. Character appearances can be modified while maintaining identity continuity across frames.
- Reference-image-guided style transfer
- Integrated VFX generation (particles, energy, ice)
- Color grading and scene-wide relighting
Technical Specifications
Runway's in-context video model analyzes input footage for lighting, depth, and object relationships, then applies prompt-guided transformations while preserving temporal coherence across every frame.
- Input: MP4 or WebM video, up to 16 MB
- Editing window: first 5 seconds of input clip
- Aspect ratios: 16:9, 9:16, 4:3, 3:4, 1:1, 21:9
- Prompt-guided editing with optional reference image
- Seed parameter for reproducible output variations
- Output: edited video with preserved motion and temporal consistency
How to Edit Videos Online with AI
Three steps from raw footage to edited output — no editing software required.
1. Upload Your Clip
Upload a short MP4 or WebM clip (up to 16 MB). Stable footage with clear subjects produces the best results. The AI video editor analyzes your scene's lighting, depth, and object relationships before applying any changes.
2. Describe the Edit
Write a natural-language prompt describing the transformation: 'make it winter,' 'remove the background crowd,' or 'add warm golden-hour lighting.' Optionally attach a reference image to guide style and color direction.
3. Generate & Iterate
Review the AI-edited output, refine your prompt, and regenerate. Use the optional seed parameter for reproducible variations. Each iteration preserves your original motion and camera work while applying the requested changes.
Prompting Guide for AI Video Editing
Effective prompts describe the specific change you want — not the entire scene. Focus on what should be different, and the Runway AI video editor preserves everything else. Reference images dramatically improve style consistency when editing videos online.
- Lead with the transformation: 'make it winter' or 'add warm golden-hour lighting'
- Name objects to add or remove: 'remove the crowd' or 'add a vintage car in the background'
- Attach a reference image to lock in color palette, texture, or artistic direction
- Keep prompts focused — one clear transformation per edit produces the best fidelity
- Iterate with refinements rather than rewriting: adjust lighting, then style, then details
Who Uses AI Video Editing
From Hollywood post-production to social media content — Runway AI video editing adapts to every workflow.
Film & TV Post-Production
Runway powers VFX for studios including Lionsgate (20,000+ title library). Transform raw footage into finished shots — add atmospheric effects, modify environments, and adjust lighting without expensive compositing. The Late Show with Stephen Colbert reduced per-edit time from 5 hours to 5 minutes using Runway AI.
Brand & Product Content
Refresh product visuals for seasonal campaigns without re-shooting. Swap backgrounds, adjust lighting to match brand guidelines, and generate multiple versions from a single shoot. Marketing teams report cutting video production costs significantly with AI video editing.
Social Media A/B Testing
Generate style variants of the same clip for TikTok, Reels, and Shorts. Change mood, environment, and color grading to test which version drives the highest engagement — all from one original recording, edited online in minutes.
Cinematic Enhancement
Add atmospheric depth to raw footage: volumetric lighting, weather effects, dramatic color grading. This online video editor transforms handheld smartphone video into cinema-quality visuals while maintaining natural motion and subject continuity.
Location & Season Transformation
Relocate scenes without travel. Turn a studio backdrop into a mountain vista, shift summer to winter, or replace an overcast sky with golden-hour warmth. Runway AI matches new environment lighting to your subjects automatically.
Object & Scene Cleanup
Remove unwanted elements — equipment, bystanders, signage — with clean background reconstruction. Insert props, products, or brand elements with physics-accurate lighting and perspective matching using the AI video editor.
Best Practices & Limitations
The AI video editor works best with stable footage, clear subjects, and focused prompts. Extremely complex scenes or large-scale changes may reduce output fidelity. For optimal results, iterate with targeted edits rather than attempting multiple transformations in a single prompt. Reference images significantly improve style consistency when editing videos online.
Output quality depends on input resolution and scene complexity. Some transformations are bounded by the model's training data. For precise control over specific elements, break complex edits into sequential steps — each building on the previous result. Runway AI preserves temporal coherence best with short, focused edit instructions.
AI Video Editor FAQ
Common questions about editing videos online with Runway AI.