# Shape and length (/docs/help/shape-and-length)

## Shapes you can choose

- **9:16** — vertical, full phone screen. For short-form feeds and stories.
- **16:9** — horizontal, widescreen. For a website, a presentation or a TV.
- **1:1** — square. For feeds that show posts as squares.

## Lengths you can choose

From 15 seconds to 10 minutes, in 15-second steps. Longer videos use more credits.

The length is a close target, not exact: the script and the way shots are cut make the finished video a little shorter or longer. You pay for the actual length, never more than the length you chose. See [How length is billed](/docs/help/credits#how-length-is-billed).

## Set them in Auto mode

In Auto mode, the pill next to **+** shows the current shape and length, for example **9:16 · 30s**.

1. Click the pill.
2. Under **Aspect ratio**, pick **9:16**, **16:9** or **1:1**.
3. Drag the **Length** slider to the length you want.
4. Click outside the menu to close it, then send your message.

## Say it in Chat mode

In Chat mode there's no pill. Tell Reela the shape and length in your message, for example:

- "A 30-second vertical video for my store's page."
- "About two minutes, widescreen, for our website."
- "Square, 15 seconds."

Reela's plan shows the quality level, shape and length, for example **Pro · 9:16 · 30s**, so you can check them before you click **Confirm and run**. To change them, just say so: "Make it 45 seconds instead." See [Chat and Auto mode](/docs/help/chat-auto).

## Tips

- Pick the shape for where the video will be watched. A widescreen video on a phone feed shows up small, with bars above and below.
- Not sure about length? Let Reela suggest one in Chat mode, or try a short version first at a lower quality level. Long videos work just as well.

## Related

- [Make your first video](/docs/help/first-video)
- [Chat and Auto mode](/docs/help/chat-auto)
- [How credits work](/docs/help/credits)