Is your thumbnail easy to read?
Upload a thumbnail — PNG, JPG, or WEBP — and see five measurements of how readable it is, plus concrete suggestions. It does not predict click-through rate. Runs entirely in your browser.
CONTRAST · BRIGHTNESS · SATURATION · WARM PALETTE · ASPECT · HUE
All analysis runs in your browser — no uploads leave your device.
HOW IT WORKS
Six dimensions. One private analysis.
Five measurements
Contrast, brightness, saturation, warm palette share and size, each measured from the pixels of your image and shown on its own, so you can see which one to adjust.
Actionable suggestions
Every weak measurement comes with a concrete suggestion: deepen shadows, add color, use 1280×720. Not just a verdict.
Your image stays local
Analysis runs 100% in your browser via canvas APIs. Nothing is uploaded to our servers — drafts stay private.
MEASURING IS HALF THE JOB
A measurement tells you what to look at.
Thumbnail Concepts tells you the fix.
Inside VANTAGEVID, the Thumbnail Concepts module generates 4 new thumbnail concepts for your topic — each with a scene, a short text overlay, a target emotion and an image-generation prompt. It's a creative partner, not a critic.
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Frequently asked
Does this predict my click-through rate?
No. It measures how readable the image is (contrast, brightness, saturation, warm color share and size) and judges each one on its own as PASS, PARTLY or FIX. There is no overall score. The thresholds are rules of thumb that we chose, not tested against real click data, and the tool cannot predict your click-through rate. Real CTR comes from testing thumbnails on your own audience, for example with YouTube Studio's Test & Compare.
Why is warm color measured?
Warm accents are a common way for a thumbnail to stand out among many in a feed, so we measure the share of warm pixels. That is a design rule of thumb, not a proven result: a blue or green thumbnail can work very well. Test it before changing a thumbnail that already performs.
Does the image size matter?
YouTube recommends 1280×720 (16:9), at least 640 pixels wide and under 2 MB. A smaller image is stretched when shown, which softens text and fine detail at small feed sizes.
Is this a replacement for Thumbnail Concepts?
No — this checks a thumbnail you already made. VANTAGEVID's Thumbnail Concepts generates 4 brand-new text concepts for your topic, each with a scene, a short text overlay, a target emotion and an image-generation prompt. Different tool, different job.