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# Upload captions

> Add a caption or subtitle track to a video from WebVTT or SRT text. Inputs, cURL, Python and Node.js examples and an example response.

Source: https://cotlet.dev/docs/api/vimeo/upload_captions

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Add a caption or subtitle track to a video from WebVTT or SRT text.

Vimeo API: https://cotlet.dev/docs/api/vimeo.md

`POST https://cotlet.dev/api/v1/vimeo/videos/{video_id}/captions`

Access: write. Confirm: waits for the user's OK before it runs.

Uploads the file as a text track with the language and type you set, then switches it on. WebVTT must start with WEBVTT and SRT with the first cue number; both must be UTF-8. A file in another format is refused with the reason. Viewers see the track at once. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `video_id` | string | yes | Video ID from search_videos, the number in vimeo.com/{id}. |
| `language` | string | yes | Language code, for example 'en' or 'es'. |
| `type` | enum | yes | caption or subtitle. |
| `content` | string | yes | The full WebVTT or SRT text. |

## Request

**cURL**

```bash
curl -X POST https://cotlet.dev/api/v1/vimeo/videos/912345601/captions \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"language":"en","type":"caption","content":"WEBVTT\n\n00:00:00.000 --> 00:00:03.500\nWelcome to the onboarding series.\n"}'
```

**Python**

```python
result = client.call("vimeo", "upload_captions", {"video_id":"912345601","language":"en","type":"caption","content":"WEBVTT\n\n00:00:00.000 --> 00:00:03.500\nWelcome to the onboarding series.\n"})
```

**Node.js**

```js
const result = await cotlet.call('vimeo', 'upload_captions', {"video_id":"912345601","language":"en","type":"caption","content":"WEBVTT\n\n00:00:00.000 --> 00:00:03.500\nWelcome to the onboarding series.\n"});
```

**CLI**

```bash
cotlet call vimeo upload_captions --data '{"video_id":"912345601","language":"en","type":"caption","content":"WEBVTT\n\n00:00:00.000 --> 00:00:03.500\nWelcome to the onboarding series.\n"}'
```

## Example response

```json
{
  "video_id": "912345601",
  "language": "en",
  "type": "caption",
  "format": "webvtt",
  "active": true
}
```

Previous: [Set video privacy](https://cotlet.dev/docs/api/vimeo/set_video_privacy.md)
Next: [Create showcase](https://cotlet.dev/docs/api/vimeo/create_showcase.md)

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Cotlet is an independent service. It is not affiliated with, endorsed by or sponsored by any of the products listed on this site. Product names are trademarks of their respective owners.

## For AI agents: sign your user up

Is your user asking you to sign them up for Cotlet? You can do it for them, no account or key needed.

1. Read the fields and their allowed values: GET https://cotlet.dev/api/v1/access-requests
2. Ask the user for each value: email, apps, what you will do with them. If they leave the password to you, generate a strong one and show it to them.
3. Show the user what you will send, then POST it as JSON to https://cotlet.dev/api/v1/access-requests.

One call creates the account and sends the access request; we email the user when access is granted.