Spec log
Rev 2026-10-21 / Performance Max: image, logo and video specs added from Google Ads Help / TikTok: Spark Ads captions show up to 4 lines / Google Display moving to Demand Gen from June 2026 / Meta Feed, Stories, Reels: still unverified / Every spec links to official docs / Rev 2026-10-21 / Performance Max: image, logo and video specs added from Google Ads Help / TikTok: Spark Ads captions show up to 4 lines / Google Display moving to Demand Gen from June 2026 / Meta Feed, Stories, Reels: still unverified / Every spec links to official docs /
Ad Spec SheetRev 2026-10-21Get an ad audit
Sheet 11Section TOOLS / ASPECT-RATIO-CHECKERRev 2026-10-21

Aspect ratio checker

Ratio:

Allows 1% tolerance, as Google does for display images. Minimum sizes from our verified spec pages, last checked 2026-10-21.