Meta Creative Specs 2026 (The only 4 ratios you need to know)
Article
Claron Kinny
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Growth & Content
Key takeaways
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A Meta campaign rarely needs one asset. It needs a set.
Run one concept across feed, Stories, Reels, and carousel and you are exporting four different canvases before you touch copy variants, markets, or offers. Get one of them wrong and the ad still runs. It just runs cropped, which is harder to catch than an outright rejection and quietly costs you the placement.
These are the specs that matter, followed by the part most spec sheets skip: what to do so the wrong file never reaches upload.
The four ratios that cover almost every placement
Most guides list eleven placements. In practice, four canvases carry the overwhelming majority of delivery, with a fifth for in-stream video.
Ratio | Pixels | Where it runs |
4:5 | 1080 x 1350 | Facebook and Instagram feed, the mobile default |
9:16 | 1080 x 1920 | Stories and Reels, full screen vertical |
1:1 | 1080 x 1080 | Carousel cards, Marketplace, safe everywhere |
16:9 | 1920 x 1080 | In-stream video |
1.91:1 | 1200 x 628 | Landscape link ads and right column |
If you can only build two, build 4:5 and 9:16. Feed and Reels are where the volume sits, and Meta will fit a vertical asset into feed more gracefully than it will stretch a square into a full-screen placement.
The 1:1 square is the safest single asset if you need one file to work everywhere, since it crops predictably rather than dramatically. It is also the least efficient use of mobile screen space, which is why it has stopped being the default.
File requirements that actually trigger rejection
Two categories of error stop an ad from running at all.
Wrong container or codec: Meta accepts JPG and PNG for images, and MP4 or MOV with H.264 for video. HEIC, MKV, and AVI fail on upload, which catches teams exporting straight from a phone or an editing suite with default settings.
File weight over the ceiling: Images cap at 30 MB and video at 4 GB. Large files are rarely a problem for static work and a common one for long-form video masters that were never compressed for delivery.
Where To Check the Official Specs
Meta's Ads Guide is the canonical reference for per-placement dimensions, character limits, and duration rules, and it changes when placements change. Its recommended minimum image pixel requirements page is the one to check before a large build, because the floor differs by surface.
Ad review itself is a separate gate. Meta's Advertising Standards state that review is typically completed within 24 hours, though it can take longer, and that ads can be reviewed again after they go live. Building that window into a launch calendar avoids the familiar scramble where creative is approved internally on the day it needs to be delivering.
Why the expensive mistake never gets rejected
Here is the failure mode that spec tables do not describe.
Upload a file in the wrong format and Meta tells you. Upload a file at the wrong aspect ratio and Meta usually accepts it, then crops or auto-fits it to the placement. The ad runs. Spend flows. Nobody gets an error message.
Meta's own documentation describes this behavior in the context of video thumbnails: images uploaded at other aspect ratios are auto-sized or auto-cropped to fit. The same principle applies across placements, and it is why aspect ratio best practices is a more useful page than the dimension list for anyone briefing a designer.
Carousel Cards Must Be Built Square
Carousel is where this bites hardest. Build every card at 1:1, because a carousel does not support mixed aspect ratios within one unit, and non-square cards are fitted to square. A 4:5 card loses its top and bottom, which is exactly where headlines and product shots usually sit. Meta publishes design specifications for carousel ads separately, and it is worth checking before building a carousel set.
Safe Zones Are a Design Constraint Rather Than a File One
Stories and Reels have a related problem that has nothing to do with the file being wrong. The file is 1080 x 1920 and correct, but the profile name sits over the top of the frame and the caption and call to action sit over the bottom. Anything important in those bands is covered. Keeping key content inside the middle of the frame is a design constraint, not a technical one, so no upload check will catch it.
What one campaign actually requires
The spec table implies a handful of files. The production requirement is larger, and it compounds in a predictable order.
Start with one approved concept. Building for feed, Stories and Reels, carousel, and the landscape link format gives you four canvases. Add three copy variants for testing and you are at twelve. Add two markets and you are at twenty-four. Add a second product and it doubles again.
None of that requires a new creative decision. It is the same idea rebuilt to four sets of specifications, which is why creative volume tends to become a production constraint long before it becomes a strategy one.
Why the Master Matters More Than the Exports
Two practical consequences follow. First, the master matters more than the exports: a concept designed with all four canvases in mind adapts cleanly, while one designed only for feed forces compromises in every other placement. Second, the failure rate scales with the number of manual export steps, which is where a checklist stops being sufficient.
How to stop spec errors before export
Catching a spec problem after delivery means rebuilding. Catching it before export means changing a setting.
Design the master with safe zones marked: Put the Stories and Reels interface bands on the canvas as guides so key content never lands under them.
Build carousel separately at 1:1: Do not adapt feed cards into carousel. Start square.
Export from one source file per concept: Multiple source files for one concept is how the 9:16 version ends up on last month's offer.
Check ratio and file weight programmatically, not visually: A person reviewing thumbnails will not catch a 1080 x 1338 export. A rule will.
Verify against Meta's Ads Guide before a large build: Placements change, and a spec sheet saved six months ago is a liability at volume.
Where Rocketium fits
Most of the list above is a discipline problem at ten assets and a systems problem at a thousand.
Once a campaign set spans placements, markets, offers, and products, the export step is where errors enter, because it is the step repeated most often. Rocketium's automated size adaptation produces the placement-ready set from one approved master, and platform compliance checks validate ratio, dimensions, file type, and weight against each destination's rules before an asset reaches review rather than after it reaches Meta.
The evidence here is about rejection rates rather than creative quality.
Human designers still review output before delivery, and the concept itself stays with your team. Automation removes the repetitive export and checking work, not the creative decision behind it.
If spec errors and platform rejections are eating a predictable share of your production time, submit a brief you have already executed to AI Studio and compare what comes back against what you shipped. It takes about 40 minutes of your team's time.
Frequently asked questions
What are the current Meta ad specs?
Use 1080 x 1350 (4:5) for feed, 1080 x 1920 (9:16) for Stories and Reels, 1080 x 1080 (1:1) for carousel, 1200 x 628 (1.91:1) for link ads, and 16:9 for in-stream video. Images cap at 30 MB and video at 4 GB.
What is the best Meta ad size?
For a single asset, 1080 x 1080 crops most predictably across placements. For a production build, 4:5 for feed and 9:16 for Stories and Reels covers the majority of delivery and uses mobile screen space better than square.
What file formats does Meta accept?
JPG and PNG for images, MP4 or MOV with H.264 encoding for video. HEIC, MKV, and AVI are rejected on upload, which commonly affects files exported directly from phones or editing software using default settings.
Why did my Meta ad get rejected?
Technical rejections usually come from an unsupported file type or a file above the size ceiling. Policy rejections are separate and come from ad review, which Meta says typically completes within 24 hours.
Do wrong aspect ratios get rejected?
Usually not. Meta auto-sizes or crops assets to fit the placement, so the ad runs with parts of the creative cut off. That makes ratio errors harder to catch than format errors and more damaging over a campaign.
What size should carousel cards be?
Build every card at 1080 x 1080 (1:1). Mixed aspect ratios within a single carousel are not supported, and non-square cards get fitted to square, so a 4:5 card loses its top and bottom.
Where do I check the official Meta specs?
Meta's Ads Guide is the canonical source for dimensions, character limits, and duration by placement, alongside the Business Help Center pages on aspect ratios and minimum pixel requirements. Verify there before any large production run.
