You can use structured data for your organisation's logo to specify the image Google Search uses in the Search results and in the Knowledge Graph.
logo (URL): URL of a logo that is representative of the organization.
url (URL): The URL of the website associated with the logo.
The image must be 112 x 112 px, at minimum.
The image URL must be crawlable and indexable.
The image must be in .jpg, .png, or. gif format.