Official-source watchlist
Social image sizes dataset
Current platform image dimensions, ratios, safe-zone notes, source URLs, and last-checked dates. New pages are intentionally noindex until each platform exposes enough dated change evidence to flip the verification gate.
YouTube
Keep the main face/title centered; small-screen cards crop visually even when the file remains 16:9.
Keep text and logos inside the central 1235 x 338 area because larger images crop differently by device.
Keep text away from the very edges; profile grids and previews can crop depending on surface.
Use a centered title area so profile grids and share previews can crop without losing the message.
Avoid tiny text; landscape posts lose vertical real estate in the feed.
Do not make the Pin much taller than 2:3; overly tall images can be truncated in feeds.
Center the headline and product so it survives board and feed previews.
Keep important text away from the lower-left profile-photo overlap.
Keep logos and CTA copy centered because feed placements can resize the preview.
X
Keep the main subject centered; profile photo and responsive cropping can hide lower-left content.
Use a much larger export at the same ratio for quality; the official figure here is the minimum.
TikTok
Keep text away from the right rail and bottom caption/action areas.
Change watch
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Free Social Image Sizes by Poster Cat