Noindex audit ledger
Size change log
Each row links a platform-size claim to the current official source and keeps unverified effective dates out of the indexed site.
YouTube thumbnail recommendation now lists 3840 x 2160
The current YouTube Help page lists 3840 x 2160 as the recommended custom thumbnail image size. Older creator guidance and many tools still reference 1280 x 720, so this row keeps the change visible while the effective date remains unknown.
pending / effective unknown / checked 2026-06-29Instagram profile grids shifted toward portrait previews
The 2025 profile-grid shift is a useful audit lead, but the official public help page does not expose a dated rollout note. Poster Cat tracks the current 3:4 portrait entry as pending-effective-date.
watch / effective unknown / checked 2026-06-29Pinterest standard Pin creative remains anchored on 2:3
Pinterest's official product specs continue to point creators toward 1000 x 1500 standard Pins. This watch row exists because overly tall Pins can lose visibility in feeds.
confirmed / effective unknown / checked 2026-06-29X profile headers stay at a 1500 x 500 canvas
X Help still gives a 1500 x 500 header-photo recommendation. The visible safe area changes by viewport, so the dataset keeps a centered-content warning beside the raw pixels.