The idea
ThumbnailTools helps you choose the YouTube thumbnail (and title) that earns the click — with evidence, not gut feel.
We are not a generic image editor. We focus on validation: diagnose, compare, and run live A/B tests.
Three layers
Layer 0 — AI Test: instant scores you can verify with your own eyes (legibility at feed size, contrast, focus, clutter).
Layer 1 — Preference: rank variants in a realistic feed context (human or synthetic panels).
Layer 2 — Live A/B: automated rotation on your channel with smart traffic allocation.
Next steps
Run a free AI Test from the homepage without an account.
Connect Google when you are ready to save projects and unlock live testing on higher plans.