What is the default Aspect Ratio (--ar) value in Runway?

Runway's default Aspect Ratio (--ar) is typically 16:9. This works well for general use, but specialized prompts often benefit from adjustment. See our recommended values above for different use cases.

Does Aspect Ratio (--ar) affect generation speed in Runway?

Minimally — this parameter primarily affects output characteristics rather than processing time. Choose your value based on the quality level you need.

What Aspect Ratio (--ar) value is best for professional work?

For professional and commercial work, we recommend 7:4. This ensures maximum quality while keeping generation practical.

Can I change Aspect Ratio (--ar) after generating in Runway?

No — Aspect Ratio (--ar) must be set before generation. However, you can quickly regenerate with a different Aspect Ratio (--ar) value using the same prompt to compare results side by side.

Parameter GuideRunway

Runway Aspect Ratio (--ar) Guide

The Aspect Ratio (--ar) setting in Runway is one of the most important parameters for controlling your output quality and style. Understanding how Aspect Ratio (--ar) works — and knowing which values to use for different situations — separates beginners from advanced Runway users. In this comprehensive guide, we break down everything you need to know about Aspect Ratio (--ar): what it does, recommended values for different styles, and common pitfalls to avoid. Whether you're creating photorealistic images, stylized artwork, or anything in between, mastering Aspect Ratio (--ar) will significantly improve your Runway results. We've tested dozens of Aspect Ratio (--ar) configurations across different prompt types to bring you the most practical recommendations.

Values & Usage

Aspect Ratio (--ar): 1:11:1

Square format — perfect for social media avatars and icons

Aspect Ratio (--ar): 16:916:9

Widescreen — ideal for wallpapers, headers, and cinematic scenes

Aspect Ratio (--ar): 7:47:4

Wide landscape — great balance for environmental scenes

Aspect Ratio (--ar): 4:54:5

Vertical — optimized for Instagram and Pinterest

Aspect Ratio (--ar): 9:169:16

Tall vertical — stories, phone wallpapers, and mobile content

Example Prompts

Demonstrating Aspect Ratio (--ar) at 1:1 — Square format — perfect for social media avatars and icons

beginner

A tracking shot scenic composition of landscape with dramatic side lighting and neon accent colors

Demonstrating Aspect Ratio (--ar) at 16:9 — Widescreen — ideal for wallpapers, headers, and cinematic scenes

beginner

A underwater scenic composition of landscape with harsh directional light and muted pastel shades

Demonstrating Aspect Ratio (--ar) at 7:4 — Wide landscape — great balance for environmental scenes

intermediate

A slow motion scenic composition of landscape with sunset rim light and warm earth tones

Demonstrating Aspect Ratio (--ar) at 4:5 — Vertical — optimized for Instagram and Pinterest

advanced

A commercial scenic composition of landscape with neon ambient glow and analogous warm palette

Pro Tips

1Start with the default Aspect Ratio (--ar) value and make small adjustments to understand how it affects your specific prompt style.
2Different styles respond differently to Aspect Ratio (--ar) changes — what works for photorealistic may not work for anime or abstract.
3Keep notes on which Aspect Ratio (--ar) values work best for your favorite prompt structures — this builds your personal Runway knowledge base.
4When sharing prompts, always include your Aspect Ratio (--ar) setting — it can dramatically change results even with identical prompt text.
5For batch generation, lock your Aspect Ratio (--ar) value to maintain consistency across an entire set of related images.

Common Mistakes

✕Using extreme Aspect Ratio (--ar) values without understanding the trade-offs — moderate values usually produce the most balanced results.

✕Assuming the same Aspect Ratio (--ar) value works for all styles — always test with your specific prompt before committing to a batch.

✕Changing Aspect Ratio (--ar) and other settings simultaneously — adjust one parameter at a time to understand each one's effect.

Frequently Asked Questions

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