What strong thumbnails usually get right

This tool scores the same fundamentals viewers react to first on mobile feeds.

Contrast

Great thumbnails stay readable when they shrink. Contrast is what keeps the subject and text alive at feed size.

BeforeFlat tones with similar brightness

AfterClear light-dark separation around the focal point

Zoom out to thumbnail size and check whether the main idea still pops.

Emotion

Faces and reactions build instant context. Strong emotion helps viewers predict the payoff before they read.

BeforeNeutral expression with no tension

AfterVisible surprise, tension, relief, or confidence

If the frame has a person, the face should tell the story in under a second.

Text Use

Thumbnail text should add clarity, not repeat the title word-for-word. Short beats clever when space is tight.

BeforeA full sentence squeezed into the frame

AfterTwo to four words that sharpen the promise

If the image already communicates the idea, less text is usually better.

Thumbnail rater.