The Instagram Reels size is vertical: 1080 × 1920 pixels at a 9:16 aspect ratio, with the most important content kept in the centre of the frame. Other formats work technically, but they cost you screen space or part of the picture, and both change what viewers actually see.
This post starts with the dimensions you can use straight away. Then it separates what Instagram officially specifies from what is only rule of thumb, and shows where sources disagree.
Instagram Reels dimensions at a glance
- Aspect ratio: 9:16 (vertical)
- Resolution: 1080 × 1920 pixels
- Frame rate: at least 30 frames per second
- Minimum resolution: 720 pixels, according to Instagram
- Accepted range: aspect ratios between 1.91:1 and 9:16
The frame rate, the minimum resolution and the accepted range come from Instagram's Help Center. The page does not say in so many words that 1080 × 1920 is the target. It is the resolution that matches full-screen 9:16 and the one that has become standard in practice. Uploading at 720 pixels wide meets the minimum but gives you a softer picture.
Export at 1080 × 1920 straight from your editor. Scaling a video up after export does not make it sharper.
Which Reels size fills the whole screen?
Only 9:16. Reels play full screen, and on a phone full screen means upright. A 4:5 or 1:1 video is technically allowed because it sits inside the 1.91:1 to 9:16 range, but it does not fill the screen.
You then get one of two outcomes: unused space, or a cropped frame where content at the edges is lost. You avoid both by filming upright from the start.
The same goes for footage you shot for the feed. A landscape clip in a Reel becomes a thin strip in the middle of the phone. Re-cut it in 9:16 before you upload.
The safe zone: where Instagram covers your frame
The safe zone is the part of the frame that neither the interface nor your caption covers. The top holds the profile row and controls. The bottom holds the caption, the audio label and the like, comment and share buttons. Text or faces in those areas get clipped or overlapped.
Instagram does not publish an official safe zone in pixels. Third-party guides give the safe centre as anywhere from 1080 × 1350 to 1080 × 1440 pixels, and the margins as roughly 250 pixels at the top and 250 to 350 at the bottom. Those figures contradict each other and we have no measurement that settles it, so the cautious rule applies:
- Put subtitles, logos and calls to action in the middle of the frame, not along the bottom edge.
- Work to the smallest quoted area, which is 1080 × 1350 pixels in the centre.
- Preview the finished Reel as a draft on your own phone before you publish.
An example: you add the words "link in bio" along the bottom edge. In your editor it looks clean. In the Reel, your caption sits right there and half the line is hidden. Move it up a little and it stays readable.
Cover image and profile crop
The cover of your Reel is vertical too. You pick it from the video in the editor or upload your own. Instagram shows Reels partly cropped in the feed and on profiles, though, so put the title and any face in the middle of the cover rather than at the edge. Instagram does not publish exact dimensions for that crop, so we do not state any.
How long a Reel can be, and how long it should be, is covered in our post on Instagram Reels length. Stories follow different specs, which you will find in Instagram Story size. The profile picture has its own dimensions again, under Instagram profile picture size.
File format and codec
The Help Center sets no strict container or codec rules that we could quote here. In practice MP4 with H.264 video and AAC audio is the safe choice. That is a rule of thumb, not an official requirement. Figures for bitrate and file size also vary widely between guides, so we do not give a firm value. Export at a common quality setting and upload in the app; you will see at once whether it goes through.
Common mistakes with the Reels size
- Uploading landscape video. It becomes a thin strip. Re-cut it to 9:16.
- Subtitles along the bottom edge. The caption covers them. Keep text in the centre.
- Exporting at too low a resolution. Below 720 pixels you miss the minimum, and just above it the video looks soft.
- Dropping under 30 frames per second. Instagram lists 30 as the minimum.
- Forgetting the cover. Keep the face and title in the middle, or the profile crop cuts them off.
Why the format matters for reach
A cleanly framed Reel looks more professional, and viewers who understand the action immediately watch longer. Whether a given format gets a direct boost from the algorithm has not been confirmed by Instagram, so we do not present it as fact. What is certain is that covered text and a cropped face cost clarity. You can see whether your Reels land from your engagement rate. With the engagement calculator you check your rate against your niche without typing in numbers by hand.
If you want to reach more people on top of a good format, see more Instagram followers and our Instagram marketing agency page for the next step.
Conclusion
The Instagram Reels size is 9:16 at 1080 × 1920 pixels, at least 30 frames per second, with key content in the centre of the frame. Anything beyond that, such as exact safe-zone values or bitrates, is not officially documented. When in doubt, take the most cautious option. Then check your results with the engagement calculator to see which Reels really work for your audience.
Frequently Asked Questions
What size is an Instagram Reel?
The standard is vertical at a 9:16 aspect ratio, usually 1080 × 1920 pixels. According to the Help Center, Instagram accepts videos between 1.91:1 and 9:16, but only 9:16 fills the whole screen.
What happens if I upload a 4:5 or 1:1 video as a Reel?
Instagram accepts the video, but it does not fill the screen. You get unused space or the frame is cropped. Export in 9:16 from the start to fill the screen.
How big is the safe zone for Instagram Reels?
There is no official figure. Third-party guides give the safe centre as anywhere between 1080 × 1350 and 1080 × 1440 pixels. Working to the smaller value is safe in every case.
How long can a Reel be?
The limit depends on the account and on Instagram's current rules, and it has changed over time. We cover it separately, in our post on Reels length.
The startviral team supports creators with social growth. We write about algorithm research, Creator Ads, and sustainable growth.
