About YouTube Thumbnail Previewer
What It Does
Upload your YouTube thumbnail and see exactly how it will appear to viewers — in search results, the home feed, and the sidebar. Customize the video title, channel name, view count, and duration to get a realistic preview.
Layouts
- Home Feed — large card format, as seen on the YouTube homepage
- Search Results — horizontal layout with thumbnail and metadata side by side
- Sidebar / Up Next — small thumbnail as seen in the recommendations column
Tips
- YouTube recommends 1280 × 720 px (16:9 aspect ratio) for thumbnails
- Check that text on your thumbnail is readable at the small sidebar size
- Preview in both light and dark mode — many viewers use dark mode
- Keep titles under 60 characters to avoid truncation
Privacy
Your thumbnail is never uploaded. Everything runs in your browser.