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📱 Mobile Feed
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Thumbnail Previewer
See your design through the eyes of a mobile scroller.
16:9 YouTube
4:3
1:1 Square
9:16 Shorts
Blur Preview (Squint Test)
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All processing is local — your images never leave your device. Drag text on the main preview to reposition.
The Squint Test
Our Blur Preview feature simulates "peripheral browsing." If you can't tell what your thumbnail is about while it's blurred, a viewer scrolling fast will likely miss it too. Top creators use this test before publishing every video — it's the difference between a 2% and a 10% click-through rate.
Optimize for Mobile
Over 70% of YouTube views happen on mobile. Use the Mobile Feed preview to ensure your text is large enough to read at small scales. A thumbnail that looks great on desktop often becomes unreadable on a phone screen — our three-panel preview catches that problem instantly.
Color Psychology
Your text color sets the emotional tone. Yellow and white create urgency and authority. Red triggers curiosity and alarm. Green signals growth or money. The fastest way to A/B test your color choice is right here — swap colors and check all three preview panels simultaneously.
The Hook Formula
The strongest thumbnail headlines are 3–6 words that raise an implicit question in the viewer's mind. Numbers ("5 Mistakes"), superlatives ("Worst Ever"), and contrasts ("Free vs Paid") consistently outperform generic titles. Use the headline input to test variations before committing to a design.