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Guides on thumbnails, social posts, carousels, and branded visuals that get clicked.

Generated Tokyo budget-video thumbnail with a traveller and the headline $10 A DAY IN TOKYO · by Lunzoai

How to Make a YouTube Thumbnail from a Video Title

Follow a real Lunzo run from a video title through creative-direction questions, a generated thumbnail, one correction and a small-screen preview.

A mountain lake at sunset, pixelated on the left and sharp on the right, under the headline "Stop blurry thumbnails" · by Lunzoai

YouTube Thumbnail Size: Dimensions, Ratio and Limits (2026)

YouTube now recommends 3840×2160 thumbnails at 16:9, under 2 MB from mobile or 50 MB from desktop. Sizes for videos, Shorts and podcasts.