> ## Documentation Index
> Fetch the complete documentation index at: https://docs.usevelo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Output format

> Set the aspect ratio a video renders at — 16:9, 9:16, 1:1, or 4:3.

A video renders at 16:9 by default. If the video is going somewhere with a different shape — a phone-first feed, a square social post, an in-app help panel — change the output format before you render.

## Changing the format

Open the **Screen** panel from the right sidebar and find **Output Format**.

<Frame>
  <img src="https://mintcdn.com/velo/pxDtlABTIFHMVKTK/images/editing-velo/output-format/01.png?fit=max&auto=format&n=pxDtlABTIFHMVKTK&q=85&s=752cadc9ffcd3a1eebe3231f8de9fa81" alt="Output Format control in the Screen panel" width="1556" height="784" data-path="images/editing-velo/output-format/01.png" />
</Frame>

| Format   | Shape      | Typical use                                   |
| -------- | ---------- | --------------------------------------------- |
| **16:9** | Widescreen | Default. Embeds, share pages, desktop viewing |
| **9:16** | Vertical   | Phone-first feeds and stories                 |
| **1:1**  | Square     | Social posts that crop to a square            |
| **4:3**  | Classic    | Slide-shaped content and older displays       |

The canvas updates as soon as you select a format, so you can see how the recording sits inside the new frame before rendering.

## Framing after a format change

Changing the shape changes how much of your recording fits. The other controls in the **Screen** panel are what you use to recompose it:

* **Background** — wallpaper, gradient, or solid colour fills the space around the recording
* **Background Blur** and **Padding** — adjust how tightly the recording sits in the frame

For vertical and square formats especially, check any [zooms](/editing-velo/zooms) you have set. A zoom framed for 16:9 may cut differently once the aspect ratio changes.