Question 1

What is a YouTube thumbnail preview tool?

Accepted Answer

This tool lets you see how your thumbnail will look on YouTube before you upload. You can preview your thumbnail alongside real competing videos to see if it stands out in search results, the home page, and suggested videos.

Question 2

What is the best YouTube thumbnail size?

Accepted Answer

YouTube recommends 1280x720 pixels with a minimum width of 640 pixels. The aspect ratio should be 16:9. Keep file size under 2MB and use JPG, GIF, or PNG format.

Question 3

How do I A/B test my thumbnails?

Accepted Answer

Upload two different thumbnail designs using the A and B slots. Both will appear in the preview among real YouTube videos, letting you compare which one stands out more. Look for which thumbnail catches your eye first.

Question 4

Why preview thumbnails with competing videos?

Accepted Answer

Your thumbnail never appears alone on YouTube. It competes with dozens of others for attention. By previewing your thumbnail among real videos, you can see if it grabs attention or gets lost in the crowd.

Question 5

Does this tool upload anything to YouTube?

Accepted Answer

No. Your thumbnails stay in your browser. We only fetch public YouTube data to show you real videos. Your images are never uploaded to any server.

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