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youtube-thumbnail

Guides creation of 1280x720 YouTube thumbnails using NanoBanana Pro prompts and Canva text overlays.

Updated Mar 23, 2026
Search Tags:#image generation#youtube#thumbnail#video marketing#canva#ctr#prompt template
One-click install
npx skills add https://github.com/sakamotomomotaro0809-netizen/tateyomi --skill youtube-thumbnail-sakamotomomotaro0809-netizen
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: youtube-thumbnail
Source: https://github.com/sakamotomomotaro0809-netizen/tateyomi/tree/main/taisun_agent/.claude/skills/youtube-thumbnail
Command: npx skills add https://github.com/sakamotomomotaro0809-netizen/tateyomi --skill youtube-thumbnail-sakamotomomotaro0809-netizen

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Creating YouTube thumbnails that earn clicks requires design knowledge, prompt-writing skill for AI image generators, and consistent branding. This Skill provides a complete manual covering thumbnail composition patterns, ready-to-use NanoBanana Pro (Gemini) prompts, color palettes, typography rules, and an A/B testing workflow so creators can produce high-CTR thumbnails without design experience. ## Core Features & Use Cases - Thumbnail Pattern Library: Four proven layouts (person-focus, Before/After, text-centric, number-impact) with composition diagrams and usage guidance. - Ready-to-Use AI Prompts: Copy-paste NanoBanana Pro prompts for generating expressive faces, split-screen transformations, backgrounds, and icons at 1280x720px. - Design System Guidance: High-CTR color palette combinations, Japanese font recommendations, text sizing rules (72-120pt main copy), and copywriting formulas. - Use Case: A creator launching a business video uses the business/side-hustle template prompt to generate a confident entrepreneur image, then adds "月収100万円" text in Canva following the 3-line rule, and A/B tests two color variants. ## Quick Start Ask the AI to generate a YouTube thumbnail for your video topic using the NanoBanana Pro prompt templates and then add text in Canva following the layout rules.

Frequently Asked Questions about youtube-thumbnail

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I create a YouTube thumbnail with AI image generation?▼

Use the provided NanoBanana Pro prompt templates to generate a base image at 1280x720px with no text, leaving space for overlay. Then upload the image to Canva, add text following the 3-line rule, and export as JPG or PNG.

What size should a YouTube thumbnail be?▼

YouTube thumbnails should be 1280x720 pixels with a 16:9 aspect ratio, exported as JPG or PNG. The guide also recommends previewing at 120x68px to verify readability at small display sizes.

What colors get the highest click-through rate on thumbnails?▼

High-contrast combinations perform best, such as navy (#1E3A5F) with white and green accents for business content, or red (#DC2626) with yellow for urgency. Avoid pastels, low-contrast similar colors, and plain gray.

How do I A/B test YouTube thumbnails?▼

Create two variants differing in one element such as expression, color, or text phrasing. Compare CTR after 48 hours, keep the winner, and iterate. Target CTR is 4-6% for new channels and 10%+ for popular ones.

Why does my thumbnail look bad on mobile devices?▼

Common causes are too much text, small faces, cluttered backgrounds, and low color contrast. Keep text to 3 lines at 72-120pt, make faces occupy 40-50% of the frame, and always preview at small sizes before publishing.

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