What it does
Upload up to 5 thumbnails and preview them in 4 realistic YouTube contexts: Homepage feed, Mobile app, Sidebar suggestions, and Search results. This lets you check readability, color contrast, and visual impact before going live.
Best practices for thumbnails
- Use large, readable text (minimum 40pt equivalent at 1280×720)
- Ensure the thumbnail is readable at 120×90px (sidebar size)
- High contrast between text/subject and background
- Use a consistent style/template for brand recognition
- Faces with clear emotional expressions increase CTR by up to 38%
This tool requires 0 credits — test as many thumbnails as you like.
