Instagram Reels ads are 1440 × 2560, not 1080 × 1920
Meta's own ads guide specifies 1440 × 2560 for Reels, for both image and video. Nearly every spec sheet online says 1080 × 1920 — along with three other numbers that don't match the source.
An Instagram Reels ad is 9:16 at 1440 × 2560 pixels, for image and video alike. Meta's guide also sets Reels primary text at 44 characters, a minimum video width of 250 px under 30 seconds and 500 px at 30 seconds or longer, and a maximum video length of 15 minutes.
Search for Instagram Reels ad dimensions and the answer comes back with unusual confidence. 1080 × 1920. Every result agrees, the tables all match, and there is nothing in the phrasing to suggest anyone is uncertain.
Meta's ads guide says 1440 × 2560.
Not as an alternative, not as a "high resolution option" in a footnote — as the resolution listed against the placement. It appears on the Reels image spec page and again, identically, on the Reels video spec page. The same guide that everyone is nominally summarising.
What are Meta's Instagram Reels ad specs?
Both Reels pages, pulled directly:
| Field | Meta's ads guide |
|---|---|
| Aspect ratio | 9:16 |
| Resolution | 1440 × 2560 |
| Minimum width (image) | 500 px |
| Minimum width (video) | 250 px under 30s; 500 px at 30s or longer |
| Video duration | 0 seconds to 15 minutes |
| Primary text | 44 characters |
| File size | 30 MB image / 4 GB video |
| Aspect ratio tolerance | 1% |
Four of those are worth sitting with, because they are not what the guides publish.
The resolution is 1440 × 2560. Both figures are 9:16 — the ratio is not in dispute, the size is. 1440 × 2560 is a third wider and a third taller than the 1080 × 1920 everybody quotes, which works out to 3.7 megapixels against 2.1. Master at 1080 × 1920 and you are shipping 56% of the pixels Meta asks for.
The minimum width for video is tiered by duration. 250 px under thirty seconds, 500 px at thirty seconds and over. We have not seen this published anywhere else at all. It is a small thing until you are batch-exporting cutdowns and wondering why the short ones pass and the long ones don't.
The primary text figure is 44 characters. The guides say 125 — which is the right number for Instagram Stories, and wrong for Reels. Meta sets primary text per placement, and Reels is the tightest of them. That gap is large enough to change how you write, not just how you trim.
Video runs to fifteen minutes. The commonly published ceiling is 90 seconds, and it is simply stale. Meta's Reels video page puts ads and organic Reels on the same limit: "Similar to organic Reels, ads can be up to 15 minutes."
The objection worth taking seriously
There is a real counter-argument in circulation: Instagram compresses video wider than 1080 px, so mastering above that is wasted effort.
Compression is real, and the compressed result is not the file you uploaded. But "the platform will re-encode it" is an argument for giving the encoder more to work with, not less. You are choosing what the encoder starts from. Handing it a 1080-wide master and hoping means the downscale to every smaller device has already happened, irreversibly, before Meta sees the file.
If you want to hold the position that 1080 is sufficient in practice, that is a defensible engineering opinion. What is not defensible is publishing it as Meta's specification, which is what the spec sheets do.
Why this particular number went wrong
Meta moved the ads guide. The current pages live under a different path, organised by placement, and the URLs people had been citing return a 404.
A spec sheet that was assembled by reading the old pages, and has since been maintained by reading other spec sheets, has no way to notice that. The number doesn't look stale. It looks like consensus, because it is one — just not a consensus with the source in it.
This is the same failure we wrote about in the Meta ad sizes post: the 1440 × 1800 figure for Facebook feed has been in Meta's guide for a long time and is still published almost everywhere as 1080 × 1350. Same guide, same shape of mistake, different placement.
We are not above it either. That post's own 9:16 row read 1080 × 1920 until we wrote this one and went back to check. It has been corrected — but it sat there wrong for six weeks, in a post whose entire subject is people not checking.
What to actually do
Master Reels creative at 1440 × 2560. Write primary text to 44 characters, not 125. If you are cutting long and short versions from one timeline, check the 500 px floor on anything thirty seconds or over.
And when a spec matters enough to build a pipeline around, open the placement page in Meta's ads guide and read the number yourself. It takes a minute and it is the only version of this that is ever current.
Sources
- Meta Ads Guide: image ad specs on Instagram Reels — resolution, primary text, minimum width, file size, aspect ratio tolerance (accessed 2026-09-15)
- Meta Ads Guide: video ad specs on Instagram Reels — resolution, primary text, duration-tiered minimum width, "Similar to organic Reels, ads can be up to 15 minutes", file size (accessed 2026-09-15)
- Meta Ads Guide: image ad specs on Instagram Stories — the 125-character primary text figure (accessed 2026-09-15)
Related: why Meta's safe zones are percentages, which is the other number on these pages that guides turn into the wrong pixel count.