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Reference image to influence the style or content of the output.
Seed unlocked - will use random seed
Online Video Editor: Transform Any Footage with AI
Edit video online using natural language prompts. This AI-powered video editor lets you upload existing footage and transform it with style changes, lighting adjustments, object manipulation, and environmental modifications. Whether you need to change seasons, apply cinematic color grading, or add visual effects, the online video editor preserves your original motion while applying your creative vision frame by frame.
What is AI Video Editing?
AI video editing transforms existing footage rather than generating content from scratch. Unlike text-to-video tools that create new videos from prompts, a video editor works with your uploaded clips and applies modifications while preserving the original camera movement, subject motion, and temporal coherence.
This approach enables changes that would traditionally require extensive post-production work: relighting scenes, swapping environments, adding or removing objects, and applying style transfers. The AI analyzes your footage frame by frame and applies edits consistently across the entire clip, maintaining visual continuity that manual editing would struggle to achieve.
The result is a powerful video editing workflow where you describe what you want changed and the AI handles the technical execution. This makes professional-grade video transformation accessible without specialized software or compositing expertise.
About Runway Gen-4 Aleph
Runway Gen-4 Aleph is an in-context video model designed specifically for video editing and transformation tasks. It processes your input footage and applies requested modifications while maintaining the original motion patterns and scene structure.
The model excels at understanding spatial relationships, lighting conditions, and temporal flow. When you request changes like "make it winter" or "add dramatic sunset lighting," it reasons about how those modifications should appear across every frame, ensuring smooth transitions and consistent application of your edits.
This makes it particularly effective for creative transformations that would otherwise require manual frame-by-frame work or complex compositing pipelines. The AI handles the technical complexity while you focus on the creative direction.
Core Video Editing Capabilities
Four fundamental capabilities that power AI video editing.
Camera & Shot Generation
Generate new camera angles from existing footage. Create reverse shots, low angles, or medium shots while preserving motion across frames. Extend shots seamlessly for longer sequences.
- • Novel view generation for alternate angles
- • Shot continuation for seamless sequences
- • Motion transfer between clips
Object Manipulation
Add, remove, or replace elements within your video. Insert crowds, products, props, or fireworks with proper lighting integration. Clean up unwanted elements or extract subjects with green screen precision.
- • Object addition with accurate lighting
- • Element removal and cleanup
- • Object replacement and retexturing
Environmental Modifications
Transform the setting without reshooting. Change seasons from summer to winter, shift time from noon to golden hour, or relocate scenes entirely. Add weather effects like rain, snow, or fog naturally.
- • Season and location changes
- • Weather effect integration
- • Time of day transformation
Visual Style Transformations
Apply aesthetic styles using reference images or text descriptions. Modify character appearances, adjust color palettes, and create consistent visual themes across your footage.
- • Reference-based style transfer
- • Character appearance modification
- • Color grading via prompts
Video Editing Operations
Common editing tasks you can accomplish with AI video editing.
Style Transfer
Transform your footage into vintage film, neon cyberpunk, watercolor art, or any aesthetic style. Use reference images to match specific looks or describe the style in your prompt.
Relighting
Shift lighting conditions without reshooting. Turn harsh midday sun into golden hour warmth, add dramatic rim lighting, or create moody nighttime atmospheres.
Object Editing
Insert new elements like products, props, or crowds with proper perspective and lighting. Remove distractions, replace objects, or add visual effects naturally.
Environment Change
Swap locations, seasons, or weather conditions. Turn a sunny park into a snowy landscape, move indoor scenes outdoors, or add atmospheric effects like fog and rain.
Color Grading
Adjust the overall color tone, contrast, and saturation of your footage. Create cinematic looks, match brand colors, or unify clips from different sources.
Scene Enhancement
Add cinematic atmosphere, enhance details, and polish raw footage. Emphasize dramatic moments, improve visual quality, and create professional-grade output.
Technical Specifications
The video editor processes short clips and outputs transformed footage with consistent motion and lighting.
Input Requirements
- • Format: MP4 or WebM video files
- • Maximum file size: 16MB
- • Processed duration: First 5 seconds
- • Best with stable footage and clear subjects
Output Options
- • Aspect ratios: 16:9, 9:16, 4:3, 3:4, 1:1, 21:9
- • Optional reference image for style guidance
- • Optional seed for reproducible results
- • Maintains temporal consistency across frames
How to Edit Video Online
Three steps to transform your footage with AI video editing.
Upload Your Clip
Select an MP4 or WebM video file up to 16MB. The editor uses the first 5 seconds, so short clips with clear subjects work best.
Describe Your Edit
Write a prompt specifying what you want to change: style, lighting, objects, or environment. Be specific about the transformation.
Generate and Refine
Review the output and iterate on your prompt if needed. Use reference images to lock in specific styles or seeds for consistent variations.
Prompting Guide for Video Editing
Effective prompts focus on the changes you want rather than describing the entire scene. The model already understands your input footage, so your prompt should specify transformations.
Focus on Changes
Write prompts like "make it winter" or "add golden hour lighting" rather than describing everything in the scene. The AI preserves what you don't mention.
Be Specific About Modifications
Instead of "make it look better," specify what to change: "add cinematic color grading with teal shadows and orange highlights" or "remove the car in the background."
Use Reference Images for Style
When you need a precise aesthetic, upload a reference image that captures the color palette, texture, or mood you want. This produces more predictable style transfers.
Iterate with Small Changes
If the first result is close but not perfect, refine your prompt rather than rewriting it completely. Small adjustments often yield better results than major prompt changes.
Popular Video Editing Use Cases
How creators and businesses use AI video editing in their workflows.
Social Media A/B Testing
Generate multiple style variants of the same clip for TikTok, Reels, and Shorts. Test which aesthetic resonates best with your audience without reshooting content.
Brand Campaign Refresh
Update existing product videos for seasonal campaigns. Change backgrounds, lighting, and color schemes to match new creative directions while keeping the core footage.
Cinematic Post-Production
Add film-grade atmosphere to raw footage. Apply dramatic lighting, weather effects, and color grading that would typically require extensive compositing work.
Content Repurposing
Transform one video into multiple stylized versions for different platforms or audiences. Create variations that feel fresh while maintaining brand consistency.
Location Transformation
Change scene environments without travel or reshoots. Move indoor scenes outdoors, swap urban backgrounds for nature, or shift between seasons instantly.
Visual Effects Integration
Add or remove elements that would normally require VFX work. Insert products, create magical effects, or clean up unwanted objects with AI precision.
Best Practices and Limitations
For Best Results
- • Use stable footage without excessive camera shake
- • Choose clips with clear, well-lit subjects
- • Keep prompts focused on one or two changes
- • Use reference images for precise style matching
- • Iterate with small prompt refinements
Known Limitations
- • Complex scenes may reduce output fidelity
- • Very large transformations can be unpredictable
- • Only the first 5 seconds are processed
- • Results depend on input video quality
- • Some requests may conflict with model constraints
Frequently Asked Questions
Everything you need to know about AI video editing online.