Skill: okaris/youtube-thumbnail-design (version 0.1.5)

--- name: youtube-thumbnail-design description: "YouTube thumbnail design with specific dimensions, contrast rules, and mobile preview optimization. Covers safe zones, text placement, face expression psychology, and A/B testing. Use for: YouTube thumbnails, video cover images, click-through optimization. Triggers: youtube thumbnail, thumbnail design, video thumbnail, click through rate, ctr optimization, youtube cover, video cover image, thumbnail maker, thumbnail tips, youtube design, video preview image" allowed-tools: Bash(infsh *) --- # YouTube Thumbnail Design Create high-CTR YouTube thumbnails with AI image generation via [inference.sh](https://inference.sh) CLI. ## Quick Start ```bash curl -fsSL https://cli.inference.sh | sh && infsh login # Generate a thumbnail infsh app run falai/flux-dev-lora --input '{ "prompt": "YouTube thumbnail style, close-up of a person with surprised excited expression looking at a glowing laptop screen, vibrant blue and orange color scheme, dramatic studio lighting, shallow depth of field, high contrast, cinematic", "width": 1280, "height": 720 }' ``` > **Install note:** The [install script](https://cli.inference.sh) only detects your OS/architecture, downloads the matching binary from `dist.inference.sh`, and verifies its SHA-256 checksum. No elevated permissions or background processes. [Manual install & verification](https://dist.inference.sh/cli/checksums.txt) available. ## Specifications | Spec | Value | |------|-------| | Dimensions | 1280 x 720 px (minimum) | | Recommended | 1920 x 1080 px | | Aspect ratio | 16:9 | | Max file size | 2 MB | | Formats | JPG, GIF, PNG | ## The 120px Test Your thumbnail appears at roughly **120px wide** on mobile — that's how most viewers first see it. **At 120px, viewers must be able to identify:** 1. The mood/emotion (from colors and expression) 2. The general subject (from composition) 3. The text (if any — only if large enough) **Test:** view your thumbnail at 120px width. If it's a muddy blur, redesign. ## Safe Zones ``` ┌─────────────────────────────────────────────┐ │ │ │ ✅ SAFE FOR TEXT AND KEY ELEMENTS │ │ │ │ │ │ │ │ │ │ ┌───┐ │ │ │ ⏱ │ │ ← Timestamp overlay │ ┌────────┴───┘ │ (bottom-right) │ ┌────┐ │ DURATION │ │ │ CH │ Chapter marker └──────────────│ └───┴────┴────────────────────────────────────┘ ↑ Bottom-left: chapter/progress markers ``` **Avoid placing critical elements in:** - Bottom-right corner (video duration timestamp) - Bottom-left corner (chapter markers, progress bar) - Extreme edges (cropping varies by device) ## Color Strategy ### High-Contrast Pairs That Work | Combination | Mood | Best For | |-------------|------|----------| | Yellow + Black | Urgency, attention | Tech, business, lists | | Red + White | Energy, excitement | Entertainment, reactions | | Blue + Orange | Professional contrast | Education, tutorials | | Green + White | Growth, money | Finance, success stories | | Purple + Yellow | Premium, creative | Design, art, creativity | | White + Dark | Clean, minimal | Luxury, minimalist channels | ### Color Rules - **Background** and **text/subject** should be complementary or high-contrast - Avoid same-temperature colors touching (red on orange = mud) - Use **3 colors maximum** per thumbnail - Saturate more than real life — thumbnails compete with bright UI ## Text on Thumbnails ### When to Use Text - Lists/numbers: "7 Tips", "Top 10" - Strong opinions: "STOP Doing This" - Results: "$10K in 30 Days" - Comparisons: "vs" between two things ### When NOT to Use Text - The video title already says it (redundant) - The emotion/visual tells the story - You can't make it large enough to read at 120px ### Text Rules | Rule | Reason | |------|--------| | Max 6 words | Readability at thumbnail size | | Min 60pt equivalent | Must be legible at 120px width | | Bold sans-serif font | Thin fonts disappear at small sizes | | Contrast stroke/shadow | Ensures readability on any background | | No small text | If it's not readable small, cut it | ## Face Expression Psychology Thumbnails with faces get **higher CTR** than faceless thumbnails. Expression matters: | Expression | CTR Impact | Best For | |------------|-----------|----------| | **Surprise/shock** | Highest | Reaction, reveal, discovery content | | **Curiosity** | High | Tutorial, how-to, tips | | **Excitement** | High | Unboxing, reviews, announcements | | **Concern/worry** | Medium-high | Warning, mistake, problem content | | **Confidence** | Medium | Expert advice, authority content | | **Neutral** | Lowest | Avoid unless your brand is minimalist | ### Face Composition Rules - Face should fill **30-50%** of the thumbnail - Eyes looking **toward the text or subject** (directs viewer attention) - Eyes looking at camera = connection. Eyes looking at object = curiosity. - Place face on one side (usually left), text or subject on the other ```bash # Generate a face-forward thumbnail infsh app run falai/flux-dev-lora --input '{ "prompt": "close-up portrait of a man with genuinely surprised expression, mouth slightly open, raised eyebrows, looking at camera, left side of frame, vibrant teal background, dramatic rim lighting, YouTube thumbnail style, high contrast, cinematic", "width": 1280, "height": 720 }' # Generate a face-looking-at-subject thumbnail infsh app run bytedance/seedream-4-5 --input '{ "prompt": "person looking amazed at a glowing holographic chart showing upward growth, dramatic blue and green lighting, right side profile view, dark background, tech aesthetic, high energy", "size": "2K" }' ``` ## Thumbnail Patterns by Content Type ### Tutorial / How-To ```bash infsh app run falai/flux-dev-lora --input '{ "prompt": "overhead flat lay of organized workspace with laptop showing code editor, colorful sticky notes, coffee cup, clean bright background, professional setup, tutorial style composition, warm lighting", "width": 1280, "height": 720 }' ``` ### Before/After ```bash infsh app run falai/flux-dev-lora --input '{ "prompt": "split composition, left side dark and messy disorganized desk, right side bright clean organized minimalist workspace, dramatic contrast between chaos and order, clear dividing line in center, high contrast", "width": 1280, "height": 720 }' ``` ### Product Review / Comparison ```bash infsh app run falai/flux-dev-lora --input '{ "prompt": "two products facing each other with dramatic lighting and sparks between them, competition battle concept, dark background with colorful rim lighting, versus comparison style, high energy, product photography", "width": 1280, "height": 720 }' ``` ### Listicle / Number ```bash infsh app run falai/flux-dev-lora --input '{ "prompt": "dynamic arrangement of 7 different colorful objects floating in space against dark gradient background, each item distinct and clearly separated, energetic composition, vibrant saturated colors, studio lighting", "width": 1280, "height": 720 }' ``` ## A/B Testing Test one variable at a time: | Variable | Test A vs B | |----------|-------------| | Face vs No face | Same composition, with/without person | | Expression | Surprise vs curiosity | | Color scheme | Warm vs cool palette | | Text vs No text | With/without text overlay | | Background | Bright vs dark | | Composition | Left-facing vs right-facing subject | ```bash # Generate variant A infsh app run falai/flux-dev-lora --input '{ "prompt": "..., bright yellow background, ...", "width": 1280, "height": 720 }' --no-wait # Generate variant B (same prompt, different background) infsh app run falai/flux-dev-lora --input '{ "prompt": "..., dark navy background, ...", "width": 1280, "height": 720 }' --no-wait ``` ## Thumbnail Checklist - [ ] 1280x720 minimum (1920x1080 preferred) - [ ] Under 2MB file size - [ ] Passes the 120px squint test - [ ] No critical elements in bottom-right (timestamp) or bottom-left (chapter) - [ ] Max 3 colors, high contrast - [ ] Text (if any) is max 6 words, bold, with contrast stroke - [ ] Face expression matches content energy (if applicable) - [ ] Doesn't duplicate the video title - [ ] Stands out from surrounding thumbnails (check your niche) - [ ] Works on both light and dark YouTube backgrounds ## Common Mistakes | Mistake | Problem | Fix | |---------|---------|-----| | Too much text | Unreadable at thumbnail size | Max 6 words or no text | | Low contrast | Disappears in the feed | Use complementary colors | | Cluttered composition | Eye doesn't know where to look | One focal point | | Generic stock photo feel | No personality, gets skipped | Authentic expressions, unique angles | | Tiny details | Lost at 120px | Bold, simple shapes | | Same style every video | Viewer fatigue | Vary within brand guidelines | | Misleading thumbnail | Kills trust, hurts retention | Match the actual content | ## Related Skills ```bash npx skills add inference-sh/skills@ai-image-generation npx skills add inference-sh/skills@image-upscaling npx skills add inference-sh/skills@prompt-engineering ``` Browse all apps: `infsh app list`


Security scan verdicts — ClawScan: clean | static analysis: clean | VirusTotal: suspicious | SkillSpector: clean (LOW)