Check thumbnail contrast, color, brightness, dimensions, and timestamp overlap. Inspect desktop and mobile feed previews with heuristic visual feedback.
Inspect an uploaded thumbnail in desktop and mobile feed mockups. Check contrast, color, brightness, dimensions, and possible timestamp overlap, with grayscale and composition overlays to help your review.
Step-by-Step Walkthrough
Step 1
Select a thumbnail or a sample image.
Step 2
Inspect the score, measurements, and suggested improvements.
Step 3
Switch preview modes and overlays, then revise the image in an editor if needed.
Pro Tip for Best Output Quality
The tool reviews rather than edits the thumbnail. Automated recommendations are visual estimates.
Key Capabilities & Features
Image measurements
Estimate contrast, saturation, brightness, and proportions.
Feed previews
Try desktop and mobile views with a sample title and channel.
Visual overlays
Show the timestamp region or rule-of-thirds guide.
Grayscale check
Inspect the image without color.
Frequently Asked Questions
Ready to try YouTube Thumbnail CTR & Contrast Analyzer?
Open the tool directly inside your browser. Completely free, zero file uploads, and no watermarks on your exports.