AI YouTube Thumbnails: Tested for Readability at 320 Pixels

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A YouTube thumbnail has one job: be readable when it’s small. We generated six thumbnails and tested each one scaled down to 320 pixels wide - roughly what you see in the suggestions list on a phone. Result: three very good, three good, none unreadable.

Seven thumbnails in 16:9 format

Results

The thumbnail with DON’T BUY THIS grabs attention most strongly: the red prohibition sign and large white letters on black stand out immediately. This is a visual assessment, not a clickthrough measurement, and should be treated as such.

Three Practical Takeaways

Short text wins. The three “very good” ratings went to two- and three-word texts. The longer the text, the smaller the letters and the faster the thumbnail stops working on a phone.

Background must yield to text. The only thumbnail where the background competed with the text received a lower rating despite correct typography. A glowing screen behind letters is a classic trap.

Special characters are no longer a problem. We tested these thumbnails with Polish text (a heavily inflected language with many diacritics), and all special characters rendered correctly wherever they appeared.

Disclaimer

Six thumbnails, one run, no repetitions. Readability assessment is visual, conducted on versions scaled down to 320 pixels wide. The built-in graphics tool does not disclose the model version.

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