Facebook and Instagram Ad Sizes and Specs (2026 Cheat Sheet)

For 2026, three formats cover practically every Facebook and Instagram placement: square 1:1 (1080×1080) for feeds, vertical 4:5 (1080×1350) as the strongest single feed format, and full-vertical 9:16 (1080×1920) for Stories and Reels. If you produce only one asset, make it 4:5; it claims the most feed screen without being cropped, and Meta can adapt it across most placements.

The specs that matter

Placement	Aspect ratio	Recommended pixels	Notes
Facebook/Instagram feed	4:5	1080×1350	The workhorse; maximum feed height
Feed (square)	1:1	1080×1080	Safe universal fallback
Stories / Reels	9:16	1080×1920	Keep key content in the center-safe zone
Right column (FB desktop)	1:1	1080×1080	Minor placement; the square covers it
Carousel cards	1:1	1080×1080	Uniform cards; first card carries the click

Other useful numbers: keep file sizes comfortably under placement limits (a few MB for images), lead with the first 30–40 characters of the headline, and expect primary text to truncate after roughly 2–3 lines in feed (copy length guide).

The three rules that outrank the numbers

1. Vertical claims attention

Feed real estate is attention: a 4:5 creative occupies roughly a quarter more screen than a 1:1 on mobile. Same CPM, more pause time. Unless a placement demands square, default vertical.

2. Safe zones beat maximum zones

Stories and Reels overlay interface elements top and bottom; product and text placed at the edges gets covered on real devices. Compose the message in the central band and let scenery own the edges.

3. Text-light images still win

The old 20% text rule is gone as a hard block, but text-heavy creatives still underperform: they read as banners, and banner blindness is the oldest reflex on the internet. One short line in-image, the rest in copy.

Producing every size without a resize afternoon

The traditional pain of specs is production: every creative needing three artboards and manual recomposition. Generation-based workflows flatten this: the creative direction is generated per format rather than cropped into it, so the 4:5 feed ad and the 9:16 story frame are siblings, not mutilations of one master file. From an imported catalog, a full placement set per product takes minutes.

The check that still needs a human: preview each placement before publishing. Meta's preview panel shows exactly how your asset renders per surface; thirty seconds there beats discovering a cropped product after spend.

Frequently asked questions

What is the best image size for Facebook ads in 2026?

1080×1350 (4:5 vertical) is the strongest single choice: it takes maximum feed height on mobile, works across Facebook and Instagram feeds, and Meta adapts it to most other placements. Add a 1080×1920 (9:16) version for Stories and Reels.

Can I use one image for all Meta placements?

You can let Meta adapt a single 4:5 or 1:1 asset everywhere, at the cost of imperfect Stories rendering. The better pattern is two assets (4:5 and 9:16), which modern generation workflows produce as variants rather than manual crops.

Is there still a 20% text rule for Facebook ads?

The hard 20% enforcement is retired, but text-heavy images still tend to underperform and can see reduced delivery. Keep in-image text to one short line and put persuasion in the primary text.

What size should Instagram story ads be?

1080×1920 (9:16), with the product and message composed in the central safe band; interface overlays occupy the top and bottom edges on real devices.

Do image specs actually affect ad performance?

Aspect ratio does: vertical formats claim more screen and correlate with better feed attention. Beyond correct ratios and sharp resolution, performance comes from the creative itself, not spec micro-optimizations.