How big is a thumbnail on a phone?

The preview shows the 120 px and 168 px widths a phone feed uses, so you see it small.

How many words should a thumbnail title have?

The tool uses a guide of 3 to 5 words and counts yours.

The tool aims for 4.5:1, the WCAG target for normal text, and treats 3:1 as the floor.

No. It uses the average brightness behind the title, so it is a rule of thumb and not a measurement of every pixel.

No. The thumbnail and the neighbouring videos are fictional and the wording is invented.

See how a sermon thumbnail looks at phone feed size. Check the title length against the 3 to 5 word guide and the text contrast against 4.5:1.

Free to use. Runs in your browser.

Three sizes at once
A fictional sermon thumbnail at full size and at the 120 px and 168 px widths a phone feed uses, beside made-up neighbouring videos.
Title length
It counts the title words against the 3 to 5 word guide.
Contrast
It estimates the WCAG contrast ratio between your text colour and the average brightness of the background behind the title, with 4.5:1 as the target and 3:1 as the floor.
One average, not every pixel
It is a rule of thumb from one average. The default title, Hold fast, is 2 words in white on purple smoke at 11% of the width: an estimated 11.0:1, readable at phone size.

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