The best banner size for a website depends on several factors, including the type of banner, the platform on which will be displayed, and the goals you want to achieve with the banner. For example, a banner that will be displayed on a desktop website might have a different size than a banner that will be displayed on a mobile website. Generally, the most common banner sizes for desktop websites are 728x90 pixels, 300x250 pixels, and 160x600 pixels. For mobile websites, the most common sizes are 320x50 pixels and 300x50 pixels.

When deciding on the banner size for your website, it's important to consider the user experience and make sure that the banner doesn't take up too much space, and become obtrusive. You also want to ensure that the banner is optimized for all devices, including desktops, laptops, tablets, and smartphones so that it can be easily viewed and interacted with by users regardless of the device they are using.

Freelance banner size services can help you determine the best size for your website, taking into account your specific goals, audience, and platform. These services can also create high-quality banners that are optimized for the web, and help you make the most of your online presence by using eye-catching graphics and engaging text.

In conclusion, the best banner size for a website is determined by several factors, including the type of banner, platform, and goals. Working with freelance banner size services can help you determine the best size and create high-quality banners that will engage and retain your audience.