YouTube thumbnail tester
Compare up to three thumbnails with their titles in mobile feed, search and sidebar previews.
Add a thumbnail or load the samples to see the comparison.
Layout simulation. Actual YouTube layouts vary by device and placement.
Preview a YouTube thumbnail before you publish
- Add your image to version A and enter the title you plan to publish. Load the two samples to compare a short title with one that may be clipped.
- Switch between the mobile feed, search results and sidebar. Check whether the subject and the main words are readable when the image gets smaller.
- Add a second or third version and compare one change at a time. Move any important text out of the duration badge, then open your preferred version in Studio.
What does this preview show?
It simulates how a cover, title and duration badge fit in three common placements. Check the cover against real videos in your category before publishing.
Can this measure click-through rate?
This preview checks how your cover reads before upload. Use YouTube Studio’s A/B test to compare eligible variations with real viewers.
Does my thumbnail leave my browser?
The tester opens the image in this browser. Saving to an account or using other connected services follows its own workflow.