A LinkedIn banner (also called a LinkedIn background banner or header image) is the large horizontal image that appears at the top of your LinkedIn profile. At 1584 × 396 pixels, this prime visual real estate serves several important purposes:
Establishes your personal or company brand identity
Makes a powerful first impression on profile visitors
Showcases professional accomplishments or services
Provides additional context about your expertise
Think of your LinkedIn banner as a visual extension of your professional brand and elevator pitch combined.