Instagram Reels Size: Dimensions, Length and Safe Zones
The official Reels specs, and what they change in the edit: where a caption goes, what length to aim for, how to export without losing sharpness.
By Hanna Eng·Video editor, Free Conservatory of French Cinema
An Instagram Reel is edited vertical 9:16, at 1080 x 1920 pixels minimum (Meta recommends 1440 x 2560 for Reels ads), as an H.264 MP4 with AAC audio. Instagram accepts up to 20 minutes, but a Reel over 3 minutes is no longer recommended to new audiences. Keep text and captions out of the top 14%, the bottom 35% and 6% on each side.
A Reel rarely fails because of the camera. It fails because a caption sits under the Like button, because the video was cut in 16:9 and cropped in a hurry, or because the export got compressed twice. Instagram's specs fit in a handful of numbers, but each one has a direct consequence in the edit. I cut Reels in DaVinci Resolve: here are the values checked against Meta's official pages, and how I apply them in the timeline, before export, not after.
Instagram Reels specs at a glance
| Setting | Value |
|---|---|
| Aspect ratio | 9:16 (full-screen vertical) |
| Resolution | 1080 x 1920 px minimum; 1440 x 2560 px recommended by Meta for Reels ads |
| File | MP4 or MOV, H.264 video, fixed frame rate, progressive scan |
| Audio | Stereo AAC, 128 kbps or more |
| Maximum length | 20 minutes (recorded and edited in the app) |
| Recommendable length | 3 minutes maximum to be shown to new audiences |
| Safe zone | Top 14%, bottom 35%, 6% on each side, kept free of text |
| Maximum file size (ads) | 4 GB |
| Profile grid preview | Vertical 3:4 crop from the center of the 9:16 cover |
Source: Instagram Help Center and Meta Ads Guide (Reels), checked October 2026.
What is the official Instagram Reels format?
The format is vertical 9:16, the shape of a phone held upright. In pixels, the working base is 1080 x 1920. Meta even recommends 1440 x 2560 for its Reels ads: if you shoot in 4K, exporting at that size costs nothing and leaves headroom for recompression.
On the file side, Meta asks for MP4 or MOV, H.264 video at a fixed frame rate with progressive scan, and stereo AAC audio at 128 kbps or more. A variable frame rate, common on phone footage, is a classic cause of sound drifting from picture after import: I convert it to a fixed rate before editing.
- Aspect ratio: 9:16, full-screen vertical.
- Resolution: 1080 x 1920 minimum, 1440 x 2560 if the source allows.
- Codec: H.264, fixed frame rate, progressive.
- Audio: stereo AAC, 128 kbps or more.
How long can a Reel be in 2026?
The Instagram Help Center says it plainly: you can record and edit Reels up to 20 minutes. The same page adds that Reels over 3 minutes won't be recommended to new audiences. In practice, past 3 minutes, mostly your followers will see it.
For a Reel that needs to find an audience, the real limit is 3 minutes, not 20. And most Reels that work are far shorter: every second has to earn its place. That is a rhythm job, not a counter. I cut everything that does not move forward first, then I look at the length.
Where to put text and captions: the safe zones
Instagram's interface sits on top of your video: account name, caption text and buttons at the bottom, Like, comment and share icons down the right side. A caption placed too low disappears under the caption text. Meta gives a precise rule for Reels ads: keep at least the top 14%, the bottom 35% and 6% on each side free of text, logos and key elements.
On a 1080 x 1920 frame, that is about 270 pixels at the top, 670 at the bottom and 65 on each edge. The figures come from the ads guide, but a regular Reel has the same interface, so I apply them to every Reel. In Resolve, I set a safe-zone guide in the viewer before writing the first title, not after export.
| Edge | Meta margin | In pixels (approx.) |
|---|---|---|
| Top | 14% | 270 px |
| Bottom | 35% | 670 px |
| Left and right | 6% each | 65 px each |
Source: Meta Ads Guide, Instagram Reels. Pixel values rounded.
Cover image and profile grid: the 3:4 crop
Since January 2025, the Instagram profile grid shows vertical 3:4 thumbnails instead of squares. Your cover stays 9:16, but only its central part shows in the grid. On a 1080 x 1920 cover, the area visible in the grid is roughly 1080 x 1440, centered.
In practice, a title placed at the very top of the cover gets cut in the grid. I put cover text in the middle third and check the grid preview before posting. Instagram lets you pick a frame from the video or upload a separate cover: I export a dedicated still rather than relying on a random frame from the cut.
Editing a Reel from horizontal footage
A lot of footage arrives in 16:9, shot for YouTube or a film. Moving it to 9:16 keeps roughly a third of the frame width: you have to decide shot by shot what stays in frame, not run an automatic center crop.
In DaVinci Resolve, I build a dedicated vertical 1080 x 1920 timeline, drop the 16:9 shots in, then reframe and animate the crop when the subject moves. A face leaving the frame, a product cut in half, on-screen text that becomes unreadable: that is where a crop and a real vertical edit part ways.
- Shoot vertical from the start when the Reel is the main destination.
- If the source is 16:9, frame wider and shoot 4K to keep room for the crop.
- Reframe shot by shot, following the subject, rather than with an automatic center crop.
Exporting without losing sharpness
Instagram always recompresses your file. The goal is not to avoid that compression, it is to hand it a clean source. An over-compressed export, recompressed again by Instagram, gives smeared flat areas and banded gradients.
I export H.264 at the timeline resolution, with a generous bitrate, at the original frame rate. I avoid passing the file through a messaging app that recompresses it before upload, and send it straight to the phone or upload from the computer. In the app settings, the high-quality upload option should be on, otherwise Instagram may lower upload quality to save data.
What about TikTok and YouTube Shorts?
The same vertical master serves all three platforms, with two caveats. YouTube classifies vertical or square videos of up to 3 minutes as Shorts, according to its official help page. TikTok also recommends vertical 9:16 in its ad specifications.
The interfaces do not overlay in exactly the same place: buttons and caption areas change size from one app to the next. By keeping Meta's margins, which are larger at the bottom than most, the same caption stays readable everywhere. That is why I cut one master with those margins, not three versions.
Frequently asked questions
What size is an Instagram Reel?
1080 x 1920 pixels, vertical 9:16. Meta recommends 1440 x 2560 for Reels ads; if you shoot in 4K, exporting at that size is fine.
What is the maximum length of a Reel?
20 minutes according to the Instagram Help Center. But a Reel over 3 minutes is not recommended to new audiences: to reach beyond your followers, stay under 3 minutes.
Where should captions go in a Reel?
Above the caption text, inside the safe zone: out of the top 14%, the bottom 35% and 6% on each side. On a 1080 x 1920 frame, keep text between roughly 270 px from the top and 670 px from the bottom.
Why does my Reel look blurry after posting?
Usually the file was compressed twice: a light export, then Instagram's recompression, sometimes a third pass through a messaging app. Export H.264 at a generous bitrate, send the file directly and turn on high-quality uploads in the app settings.
What size should a Reel cover be?
1080 x 1920, like the video. The profile grid only shows its central 3:4 area, about 1080 x 1440: keep the cover title in the middle third.
Can you post a Reel in 16:9?
Yes, but it shows with large bars and loses the point of full screen. Reframing to 9:16 shot by shot, following the subject, works far better than posting as is.