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The Social Magnum blog
Notes from building on all social networks — the platform rules, the publishing playbooks and the API behaviour nobody documents. Every figure here was checked on a live account.
8 min
YouTube Banner Size: One Image, Four Different Crops
2560 × 1440 is the figure everyone quotes. The minimum, the safe area and the 6 MB cap are on YouTube's page too, inside a collapsed section, and the safe area it gives is not the one guides repeat.
Read the article
9 min
YouTube Thumbnail Size: What Changed, and Whether Your Old Files Still Work
YouTube now recommends 3840 × 2160, but most of page one — and Google's own AI Overview — still says 1280 × 720. Here is what actually changed, and why your existing thumbnails are fine.
Read the articleWe write this down because we hit it ourselves.
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