Test your thumbnail before you publish.
See how your thumbnail looks inside a realistic YouTube feed—desktop, sidebar, and mobile. No guesswork.
No login required. Runs in your browser.
How it works
Upload thumbnail
Drop your PNG, JPG, or WebP. Add a title so you can spot it in the feed.
See it in a real feed
Your thumbnail appears among others—desktop home, watch sidebar, or mobile.
Shuffle and test
Change its position. Zoom the view. See if it stands out.
Three layouts. One thumbnail.
Desktop feed
Sidebar
Mobile
Mobile feed
Why this exists
You design thumbnails in isolation. But viewers see them in crowded feeds, next to dozens of other videos. What looks good in Figma or Photoshop might get lost when it's one small tile among many. This tool lets you see the real context before you hit publish.
What you get
Realistic feed simulation
Desktop home, watch sidebar, and mobile layouts that match how YouTube actually displays content.
Shuffle positioning
Randomize where your thumbnail appears. Test if it stands out from different spots.
Multiple layouts
Switch between home feed, sidebar suggestions, and mobile to see all contexts.
Private local storage
Everything stays in your browser. No uploads to a server, no account needed.