WEBVTT

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Start with the shape. YouTube recommends sixteen by nine for standard video thumbnails. Our original test

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image is four by three. Putting it into a wider frame requires a choice: fit, crop, or stretch.

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Fit keeps the whole composition. Our twelve hundred by nine hundred source becomes nine hundred sixty by

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seven hundred twenty, leaving one hundred sixty pixels of padding on each side. One quarter of the output

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frame is padding.

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Centered Fill covers the frame without stretching. It keeps a twelve hundred by six hundred seventy five

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region from the source. That is seventy five percent of its area. The top and bottom labels disappear,

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but the circle stays round.

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Stretch maps every edge into the frame, but uses different horizontal and vertical scales. The circle

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becomes wider. This is an illustrative control, not a mode in our resizer. Download the samples and

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calculations from Thumb Glance to check the tradeoffs yourself.