Thumbnail Previewer & Tester
See how your YouTube thumbnail looks in real search results, homepage feed, and suggested sidebar before you publish. Upload your design, load real competitors, and compare multiple variants side by side.
How it works
How to use the thumbnail previewer
Upload your design, set your title, and preview across three YouTube layouts with real competitor context.
Upload one or more thumbnails
Start with your main thumbnail and add alternatives to compare quickly.
Set title and keyword context
Add your video title, then optionally load search competitors or a specific channel.
Analyze and review score
Use the right analysis sidebar to identify what is already strong and what should be fixed first.
Generate better variants
Create a stronger thumbnail prompt and optimized title options directly from your analysis.
FEATURES
What the thumbnail previewer includes
Three layout previews, live competitor data, multi-variant upload, and full metadata control in one tool.
Analyze thumbnail
Get an overall score plus metric breakdown for contrast, faces, color pop, and text readability.
Load competitors
Pull keyword-based YouTube competitors so you can preview your thumbnail against real context.
Load channel videos
Compare your thumbnail against a specific channel's recent uploads using handle, URL, or channel ID.
3 YouTube preview views
Preview in Search Results, Homepage Feed, and Suggested Sidebar contexts.
Desktop + mobile preview
Toggle desktop/mobile to validate readability and composition before publishing.
Multi-Thumbnail upload
Upload multiple variants, switch instantly, and remove options as you iterate.
Why creators use this thumbnail previewer
Built for anyone who wants faster production and higher CTR.
Real YouTube context
Preview how your thumbnail appears in the three places that drive discovery: search results, homepage feed, and sidebar suggestions
Clear analysis panel
Get an overall score, metric-by-metric breakdown, and prioritized fixes for contrast, faces, color pop, and text readability.
Fast iteration workflow
Upload multiple variants, switch instantly, and generate new thumbnail and title ideas from the same analysis result.
Frequently asked questions
What is a good YouTube thumbnail size?
Use 1280x720 pixels in a 16:9 ratio. Keep the file under YouTube's upload limits and verify readability at small sizes.
How can I test if my thumbnail stands out?
Load competitors with a keyword or channel, switch to the same context your audience sees, and use Stand Out mode to run a quick visual isolation test.
Can I compare multiple thumbnail options?
Yes. Upload multiple variants in Setup and click each one to instantly update preview, score, and suggestions.
Does this work for mobile YouTube viewers?
Yes. Toggle to mobile preview and review how thumbnails and text hold up at smaller feed sizes.
What should I improve first for higher CTR?
Start with the weakest metric in the analysis panel. Most creators see the fastest gains by fixing text readability and contrast first.
How is this different from other thumbnail previewers?
Most preview tools show your thumbnail in one or two layouts without real competitor context. This tool loads actual YouTube search results or a specific channel's videos as competitors, offers multi-thumbnail upload with instant switching, includes Stand Out mode for visual isolation testing, and lets you customize metadata. All free with no account required.
Stop losing views to mediocre thumbnails
Generate studio-quality thumbnails that stop scrolling and drive clicks in seconds. No design skills needed.
+50% average CTR increase
2× faster production speed
90% reduction in design cost
