Free YouTube Thumbnail Tester
See exactly how your YouTube thumbnail looks in search results, the home feed, suggested videos, and mobile — all at once. Paste a URL and analyze in seconds.
A compelling thumbnail is the #1 driver of click-through rate. Our thumbnail tester shows you side-by-side competitor comparisons so you can judge how yours stands out.
Editing is a pain in the ass, right?
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AI Video Editor
Drop your footage, tell it what you want. Cubix cuts, captions, color grades, and exports — fully on its own. No timeline. No manual work. Just results.
Cinematic Screen Recorder
Hit record on Windows. Auto-zoom, cinematic backgrounds, and studio-quality audio kick in automatically — your screen recording looks edited before you've touched a thing.
Search Results Preview
See how your video appears alongside competitor videos in YouTube search results with real card layout.
4 Size Previews
Preview your thumbnail at search result (246×138), home feed (360×202), suggested (168×94), and mobile (180×101) sizes.
Competitor Comparison
With a free YouTube API key, see real competitor thumbnails alongside yours in the search results mockup.
Frequently Asked Questions
How does the YouTube thumbnail tester work?
Paste any YouTube video URL and we fetch its thumbnail directly from YouTube's servers. We then render it at different display sizes and show it in a search results mockup.
Do I need a YouTube API key?
No. Without an API key, you still get the full thumbnail preview and size comparison. An API key enables real views, duration, and competitor thumbnails in the search results tab.
What's the ideal YouTube thumbnail size?
YouTube recommends 1280×720 pixels (16:9 aspect ratio). Maximum file size is 2MB. Use JPG, PNG, GIF, or WebP format for best results.
Is the YouTube thumbnail tester free?
Yes. Test YouTube thumbnails for free with no signup, no limits, and no software to install.
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