> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://support.thumbnailtest.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How does it work?

We store all the thumbnails you upload. Every day at midnight PST or every hour, we change the thumbnail on your chosen video to the next thumbnail in the list. At the end of the test, we look back at the click-through rate each thumbnail got and use that to calculate which thumbnail performed the best. That thumbnail (or title) is marked the winner.