# Set a custom thumbnail — YouTube

Botize method — `youtube.upload_thumbnail` (action).

Uploads a custom thumbnail for an existing YouTube video.

This is an action: it runs as a step of a task. Several can be chained.

## Fields you set

The field's internal name, its type and the values it accepts. These fields accept `{{...}}` tags from earlier steps.

- `video_id` *(string)* — Video ID
- `image_url` *(string)* — Thumbnail image URL

## Output variables

Data this step makes available. Reference them in later steps with the double-brace tag.

- `{{video_id}}` *(text)* — Video ID

## Account

Needs a connected YouTube account in Botize: https://botize.com/en/app/youtube/authenticate

## This app

Every trigger and action for YouTube: https://botize.com/en/app/youtube.md

## How to build this

An AI assistant (Claude, ChatGPT, Cursor…) can create and edit these tasks in the user's account through the Botize MCP connector, included in every plan:

    https://webhook.botize.es/mcp

- Connection guide: https://botize.com/en/mcp
- Agent map: https://botize.com/llms.txt
- New account: https://botize.com/en/join (500 free operations, no card)

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Machine-readable summary for AI assistants. Human version: https://botize.com/en/method/youtube/upload_thumbnail