Preview a thumbnail on YouTube

Preview an image in YouTube-like layouts to judge it in context before publishing.

How to use it

Open Thumbnail Preview.
Drop your thumbnail into the upload area, or click it to choose a file.
Set the preview title, then check the YouTube Feed tab and the All Sizes tab (Web Browser and Mobile layouts).
Toggle the preview theme and check both the subject and title at small sizes.

What happens

The tool changes the preview context, not the image itself. Feed and card layouts help reveal crowded compositions or unreadable text; they do not measure actual viewer clicks.

Example

Preview	What to inspect
Large view	Face, product and text details
Compact feed or sidebar	Whether the main subject still stands out
Light and dark themes	Whether the image edges and text stay clear

If a product disappears into the background in the compact view, simplify that background in the generator and preview the new result.

Good to know

This is a visual simulation. It does not publish the thumbnail or predict CTR, and YouTube layouts can differ.

Use Compare to shortlist your generated images before checking the final candidate in context.