Instagram Reels Size & Dimensions in 2026 (The Full Meta Spec)

The Instagram Reels size is 1080×1920 pixels — a 9:16 vertical frame. Meta's publishing specification accepts a very wide ratio range but recommends 9:16, caps the file at 300 MB, the length at 15 minutes, and the width at 1920 horizontal pixels.

Those are the numbers Meta publishes. What almost no article covers is the rest of that same specification — the container, codec, frame-rate and chroma requirements that decide whether an upload succeeds at all. A file can be exactly 1080×1920 and still be refused. Everything below was read from Meta's developer documentation on September 17, 2026.

Instagram Reels frame size and specs at a glance

What the aspect-ratio range actually means

Meta's accepted range — 0.01:1 to 10:1 — is not an invitation. It is the range that will not throw an error. The same sentence in the spec recommends 9:16 "to avoid cropping or blank space," and that is the real rule: anything else either gets cropped or gets padded, and in a full-screen vertical feed both make your video look like it was posted by accident.

The practical version: build one 1080×1920 master and keep the subject centered. A 9:16 frame fills the screen on every phone. A 1:1 or 4:5 video will play, but it surrenders a third of the display to empty space.

Note that Instagram's feed image specification is a different thing entirely — JPEG, 8 MB, an accepted ratio of 4:5 to 1.91:1, and a width between 320 and 1440 pixels, scaled to fit if you fall outside. If you have read that 4:5 is "the Instagram size," that is the number you saw. It does not apply to Reels.

The encoding spec that decides whether your upload works

This is the part worth bookmarking, because it is where uploads fail for reasons the error message never explains.

• Container: MOV or MP4, moov atom at the front. The moov atom is the index of the file. Written at the end — which is the default for many encoders — a player or an ingest server has to read the entire file before it can start. Most tools call this "fast start" or "web optimized". Turn it on.
• No edit lists. An edit list is a re-ordering instruction some editors write when you trim without re-encoding. Export a fresh file rather than a trimmed copy.
• Closed GOP. Each group of frames stands on its own, so the platform can cut and stream your video without reaching backwards for reference frames.
• 4:2:0 chroma subsampling. This is the one that catches people. Most editors default to 4:2:0 and you never think about it — but some high-quality presets, screen recorders and filter chains quietly produce 4:4:4, and a 4:4:4 file can be rejected during processing even though it plays perfectly on your machine. If an upload fails for no visible reason, check this first. On the command line, ffprobe will name the pixel format; anything reported as yuv444p needs a re-export at yuv420p.
• 23–60 fps, VBR up to 25 Mbps. Higher frame rates are not accepted, and there is no benefit to exceeding the bitrate ceiling — it is a cap, not a target.
• AAC audio, 48 kHz maximum. A 96 kHz master needs downsampling.

Cover photos and the crop you cannot see

A Reels cover is JPEG, up to 8 MB, sRGB. Meta recommends 9:16 — and states plainly what happens otherwise: an image that is not 9:16 is cropped to the middle-most 9:16 rectangle.

That matters more than it sounds, because the same cover is displayed in two shapes: full-height in the Reels player, and cropped again on your profile grid. Anything you place near the top or bottom edge of a cover — a logo, a caption, a face — is at risk in one of those two views. Keep cover subjects dead center and you survive both crops.

Length: what is allowed versus what gets seen

Meta's publishing specification caps a Reel at 15 minutes and requires at least 3 seconds. The in-app allowance and the recommendation rules are documented separately from this spec and change more often — our YouTube Shorts size guide, verified July 12, 2026, covers the length ceilings across Shorts, Reels and TikTok side by side, including which lengths stay recommendable to new audiences.

The short version for anyone making short-form content: the interesting question was never the ceiling. Clips that earn reach are far below any of these limits, and the ceiling only matters when you are publishing something long on purpose.

One vertical master, three platforms

Reels, Shorts and TikTok all run on the same 1080×1920 canvas, so a single correctly encoded vertical file posts everywhere without a re-export. Meta's specification is the strictest of the three on encoding, which makes it a useful target: 1080×1920, H.264, 4:2:0, closed GOP, fast-start MP4, AAC at 48 kHz, under 300 MB. A file that satisfies Instagram will satisfy the other two.

Cutting that file out of long horizontal footage is the part worth automating. A reframe tool that tracks the subject converts 16:9 to 9:16 without the beheaded-speaker problem a static center-crop produces — it needs a free account and gives you one short a day. If you want the whole chain instead, an AI clip generator finds the strongest moments in a long video, reframes each one, and writes titles and hashtags in a single pass, with one free trial clip to test on your own account, no card needed.

FAQ

What size is an Instagram Reel in pixels?

1080×1920 pixels — 9:16 vertical. Meta's specification caps the width at 1920 horizontal pixels and recommends the 9:16 ratio; other ratios are accepted but get cropped or padded.

What is the maximum length of an Instagram Reel?

Meta's publishing specification allows 15 minutes maximum and 3 seconds minimum. The in-app limit and the length beyond which Reels stop being recommended to new audiences are documented separately — see our Shorts, Reels and TikTok length comparison.

What is the maximum file size for an Instagram Reel?

300 MB, per Meta's published specification. The cover photo is limited separately to 8 MB.

Why was my Reel rejected when the size was correct?

Because Reels have an encoding specification, not just a size. The common causes are a moov atom written at the end of the file instead of the front, an edit list left behind by a trim, 4:4:4 chroma instead of the required 4:2:0, a frame rate outside 23–60 fps, or audio above 48 kHz. Re-export as a fast-start MP4, H.264, yuv420p, AAC 48 kHz.

Are Reels and Shorts the same size?

Yes — both use a 1080×1920, 9:16 canvas, so one file works for both. The rules that differ are length and recommendation, which our YouTube Shorts size guide covers platform by platform.

Does Instagram accept 4K Reels?

No. The specification caps the picture at 1920 horizontal pixels, so a 4K master is downscaled. Export at 1080×1920 and spend the bitrate there instead.

Specifications verified September 17, 2026 against Meta's Instagram Platform developer documentation (IG User Media reference, "Reel Specifications"). Platforms revise these numbers without announcement — if something above looks stale, it probably changed again; we re-verify quarterly.