Stop Guessing.
Engineer Your Clicks.
A professional suite of mathematical diagnostic tools to test your YouTube thumbnails for contrast, safe zones, and CTR before you publish.
Download a ThumbnailDiagnostic Tools
Heatmap Tracker
See exactly where viewers look first using AI eye-tracking.
Preview Simulator
Test your thumbnail against real YouTube UI layouts.
CTR Analyzer
8-point diagnostic for contrast, text density, and safe zones.
Thumbnail Compressor
Shrink massive images to fit YouTube's strict 2MB limit.
WebP Converter
Convert JPG to WebP for lightning-fast loading.
Contrast Analyzer
Check if your text pops against complex backgrounds.
Brightness Analyzer
Ensure your thumbnail isn't too dark for mobile screens.
Size & Safe Zone
Verify dimensions and ensure UI doesn't block your text.
A/B Tester
Compare multiple thumbnail designs side-by-side.
Title Analyzer
Check character counts so your title doesn't get cut off.
1280x720 Cropper
Instantly crop any image to the perfect 16:9 YouTube ratio.
Color Extractor
Extract the exact hex color palettes from viral thumbnails.