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    Thumbnail Text Checker

    1

    Audit YouTube thumbnails for legibility, technical specs, and competitor differentiation.

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    Thumbnail Text Checker

    Thumbnail Text Checker

    Example session with this skill installed

    Audit my thumbnail hero_v1.jpg and compare it against the files in the competitors/ folder. Ensure the text is readable on mobile.

    • Read your context and instructions
    • Compiled the thumbnail text checker
    • Generated the image

    I have analyzed hero_v1.jpg against the technical requirements and compared it to your 3 competitor files. The thumbnail meets resolution standards but has a high risk of text occlusion in the bottom-right corner.

    Thumbnail Audit Report: hero_v1.jpg

    MetricResultStatus
    Resolution1280 x 720PASS
    Aspect Ratio16:9PASS
    File Size840 KBPASS
    Contrast Ratio4.8:1WARNING: Low contrast on "Review" text
    Mobile Legibility65%POOR: Secondary text too small
    Timestamp SafetyCRITICALThe "2024" text will be hidden by the timestamp

    Visual Differentiation Analysis

    • Your Palette: Primary #FFFFFF (White), Secondary #FF0000 (Red).
    • Competitor Trend: 2/3 competitors use heavy Blue (#0000FF) backgrounds.
    • Recommendation: Your red accents provide high contrast against the current market trend.

    Next steps

    • Move the "2024" text to the top-left or center-left to avoid the YouTube timestamp overlay.
    • Increase the font size of the secondary text by at least 20% for mobile viewers.
    • Run the --make command to test a yellow (#FFFF00) text variant for higher contrast.

    hero_v1.jpg

    PNG · 1536×1024

    Generated

    Example file from a real run - the skill writes it into your workspace.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    Thumbnails that look great on a desktop monitor often fail on a mobile feed. This skill evaluates your YouTube, podcast, or course cover art for technical compliance and visual impact before you upload.

    What it does

    • Technical validation checks for 1280x720 resolution, 16:9 aspect ratio, and the 2MB file size limit.
    • Legibility simulation renders the image at mobile, sidebar, and TV scales to ensure text remains readable.
    • Overlay protection detects if the bottom-right timestamp will obscure critical faces or text.
    • Visual audit measures contrast, colorfulness, and text-to-image ratios to ensure high-click impact.
    • Competitor analysis compares your file against others to identify color and brightness differentiation.
    • Template rendering generates simple text-on-image thumbnails from raw frames.

    How it works

    1. Run the audit command on a local image file to receive a full technical and visual report.
    2. Provide competitor images to generate a side-by-side comparison sheet for visual standout analysis.
    3. Use the generation command to overlay high-contrast text onto a specific frame using hex color codes.

    Frameworks & tools

    This skill utilizes Pillow for image processing and pytesseract for optional OCR text detection.

    Why this beats prompting it yourself

    Generic AI vision prompts often miss technical constraints like the YouTube timestamp location or exact aspect ratios. This tool uses deterministic scripts to measure pixels and contrast levels, providing objective data rather than subjective opinions.

    Use cases

    • Audit high-production YouTube thumbnails for mobile legibility.
    • Check if text overlays will be blocked by UI elements.
    • Compare a new design against the top 5 ranking videos for a specific keyword.
    • Generate rapid A/B test variations with different text colors.

    Known limitations

    OCR features require Tesseract to be installed on the local system. Visual differentiation is limited to color and brightness metrics.

    How to use

    Skills on Agensi run inside your AI agent. Copy the prompt, paste it into your agent, and it connects to Agensi and installs this skill for you. If a payment is needed, your agent shows it to you first.

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