https://socialspecsheet.com/Dated changes to social media specs (sizes, limits, lengths) from official platform sources, from the SocialSpecSheet changelog.en-gbThu, 22 Oct 2026 00:00:00 GMThttps://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-22-youtube-1Thu, 22 Oct 2026 00:00:00 GMTYouTube's thumbnail help page says vertical videos with a 16:9 custom thumbnail get an auto-generated 4:5 thumbnail on the home, explore and subscription pages; your custom thumbnail still appears on the watch feed, watch history and non-mobile platforms. For Shorts, YouTube recommends a 9:16 thumbnail at 2160 x 3840 px (minimum height 640 px). Source: https://support.google.com/youtube/answer/72431?hl=en. Our guide: https://socialspecsheet.com/youtube/shorts-thumbnail-size/https://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-22-instagram-1Thu, 22 Oct 2026 00:00:00 GMTVerified Instagram max reel length: 20 minutes (one or multiple clips), from Instagram Help "Record a reel on Instagram"; Instagram notes reels over 3 minutes won’t be recommended to new audiences. New quick answer: How long can an Instagram Reel be?https://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-16-instagram-facebook-1Fri, 16 Oct 2026 00:00:00 GMTVerified 3 Meta Ads Guide values (labelled as ad specs, not organic limits): Instagram Story image 9:16 / 1440 x 2560 px (JPG or PNG, max 30 MB, min width 500 px); Facebook feed image 4:5 / 1440 x 1800 px (max 30 MB, min width 600 px); Facebook feed video 1 s–241 min / max 4 GB. New size guides: Instagram Story, Facebook feed image, Facebook video. Resizer presets for the two image sizes. Instagram caption and profile photo, Facebook post characters, LinkedIn "See more", and Pinterest board cover stay unverified.https://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-16-youtube-x-linkedin-tiktok-threads-1Fri, 16 Oct 2026 00:00:00 GMTVerified 11 more values from official help and developer pages, each with a quote: YouTube Shorts aspect ratio, title limit (Data API) and description limit; X header photo, profile photo and image file size (API docs); LinkedIn video length/size and document limits; TikTok caption length (Content Posting API); Threads post and video limits (Threads API). New size guides: YouTube Shorts, X header, LinkedIn video, Threads video. Instagram caption, profile photo and story size, Facebook post and video limits, and Pinterest board cover stay unverified (no official number found).https://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-16-youtube-linkedin-facebook-tiktok-1Fri, 16 Oct 2026 00:00:00 GMTVerified 15 more values (14 new entries, plus TikTok max video length now confirmed) from official help pages: YouTube banner, banner safe area and thumbnails; LinkedIn profile banner, Page cover, Page logo and link image; Facebook Page cover photo and profile picture; TikTok video length, dimensions, file size and frame rate. Facebook feed image size stays unverified.https://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-16-site-1Fri, 16 Oct 2026 00:00:00 GMTNew: per-format pages (e.g. Instagram Reel size, YouTube banner size), image resizer, UTM builder, hashtag counter, improved character counter, About and Methodology pages. Brand mark changed to the Stacked S.https://socialspecsheet.com/changelog/socialspecsheet-changelog-2026-10-16-all-1Fri, 16 Oct 2026 00:00:00 GMTv1 launch: initial dataset. Only values confirmed on official pages fetched today are marked verified.