Thumbnails are a great way of telling your (potential) viewers what your video is about and why they should watch it. It is therefore important that these stand out from the others.
A thumbnail can draw attention by:
YouTube offers resources to create better custom thumbnails including image size and resolution, policies, etc.
Exception: Customized thumbnails are not required for unlisted videos. Since these videos are intended for a specific audience and won't appear in public search results or recommendations, the default auto-generated thumbnail is sufficient to save time and resources.
Establishing a unique visual style for thumbnails is great for grouping similar videos together and encouraging click-throughs. This has the added benefit of increasing brand recognition and strengthening the connection between grouped content.
❌ Figure: Bad example - Bad example - Automatically generated thumbnails are not engaging and inconsistent
✅ Figure: Good example - Good example - Consistent thumbnail styles elevate branding and helps viewers identify similar content