High-contrast scenes, exaggerated expressions and clean space for text — the thumbnail formula, generated.
Thumbnails drive clicks. The best ones share traits: one clear subject, strong contrast, an expressive face and room for a few big words.
Generate scenes with the Image Generator, or use the AI Photo Editor to put yourself in a scene with an exaggerated expression.
Generate the background: 'Dramatic 16:9 thumbnail background, glowing treasure chest in a dark cave, space on the left for text.'
Add yourself: Upload your photo to the AI Photo Editor and describe the scene and expression.
Add text: Overlay 3–5 big words in your editor.
16:9 ready: Matches YouTube's 1280×720 minimum.
Your face, new scene: Identity-preserving edits.
Space for text: Ask for empty areas in the prompt.
What size are YouTube thumbnails? 1280×720 px (16:9), under 2MB. Compress the result with the free Image Compressor if needed.
Can AI write the thumbnail text? Nano Banana Pro renders short text well, but editing text yourself gives more control.
Can I use a frame from my video? Yes — enhance it first, see our screenshot quality guide.
Is it free to try? Yes. Signed-in accounts get 10 free credits every day, and new users can try Pro free for 7 days — cancel anytime. No watermark on any plan.