Introduction

Expand Ratio lets you change the aspect ratio of any video in Edit Studio without cropping your original footage or leaving empty space at the edges. Powered by Aleph 2.0, the new frame is filled in seamlessly so the result looks like it was always intended for the new format.

Upload your footage in Edit Studio, choose the new format, describe what should appear in the extended areas of the frame, and Aleph 2.0 generates the rest of the scene.

Original	Expanded video

This tutorial covers how to access and repurpose a video into a different format using Edit Studio.

Step 1 – Opening Edit Studio

Edit Studio lives in the Apps section alongside Runway's other tools.

1. From the Runway dashboard, go to Apps.
2. Open the Video app category and select Edit Studio.

You can also begin typing edit studio into the Apps search bar to jump straight to it.

Step 2 – Uploading your video

Click Upload to add a video from your device, or Select to choose from your Runway assets. You can also drag and drop into the upload area.

Note that the uploaded video must:

While multi-shot videos may work in some cases, using a single-shot video that is free of cuts/shot changes will yield the most consistent results. 

Step 3 – Choosing the aspect ratio and previewing edits

Activate Expand Video by selecting an aspect ratio that differs from the original video. When activated, you'll see borders added to the video that indicate the expansion area.

While completely optional, text prompts help:

• Guide what populates in the expanded area
• Guide any stylistic changes that should accompany the expansion

Without a prompt, the model will automatically fill the space based on the existing context and maintain the original style from the video.

Original frame	Prompt	Output
	None
	Sun in the sky

Submit the keyframe edit to preview the adjustment as an image. All keyframe edits appear in the Prompt versions tray menu on the right-hand side. When hovering over a version, three action icons appear:

• Reuse prompt — Reload the prompt & keyframe selection of an edit.
• Edit this image — Make further edits to the generated keyframe.
• Preview — Open a before & after comparison to review the changes.

For best results, we recommend confirming that the composition is largely unchanged with the Preview comparison window before generating the video. 

Step 4 – Running your edit

Click Generate Video once you're satisfied with the preview and have the desired keyframe version selected. Aleph 2.0 will use this keyframe to guide the generation without the need for a prompt.

Your generation will appear in the video versions feed as it processes. While it generates, you can continue editing frames and queuing up new variations, or upload a new video to edit or expand separate shots in tandem.

Spec details