Instagram post size
The Instagram post size is 1080x1080 pixels, a ratio of 1:1. Check a file against it in your browser and see which edges the square feed crop would eat.
Every Instagram post size
| Where it is used | Pixels | Ratio | What the number is for |
|---|---|---|---|
| Square post | 1080x1080 | 1:1 | The classic feed shape, and the one the profile grid is going to show anyway. |
| Portrait post | 1080x1350 | 4:5 | The tallest a feed post may be, so it takes the most screen for the same scroll. |
| Landscape post | 1080x566 | 1.91:1 | The short one, worth it only for a photograph that genuinely needs its width. |
Check an image you already have
Choose a file and this says whether it fits, and what gets cropped if it does not.
Resize it to these pixelsEvery Instagram post size, in pixels
Instagram redraws every feed upload onto a canvas 1080 pixels wide, so the pixel count is settled before you start and the only real decision left is which of the three feed shapes you hand it.
- Square post: 1080x1080px, a ratio of 1:1. The classic feed shape, and the one the profile grid is going to show anyway.
- Portrait post: 1080x1350px, a ratio of 4:5. The tallest a feed post may be, so it takes the most screen for the same scroll.
- Landscape post: 1080x566px, a ratio of 1.91:1. The short one, worth it only for a photograph that genuinely needs its width.
- All three shapes are 1080 wide. Uploading at 2160 or 4096 buys nothing, because the downscale happens on their side before a single person sees the post.
- Whatever shape you post, the grid on your profile crops it back to a square, so a portrait post loses its top and bottom in that second view.
- A post cannot be reshaped after publishing. Instagram lets you rewrite a caption and never lets you redo the crop.
Check a file you already have against the Instagram post size
Most people arrive holding a file and wanting one answer: will this post cleanly, or is Instagram about to take a bite out of it. Measuring the file gets there faster than reading any chart.
- Pick the target first. This page carries 3 Instagram post sizes, and a verdict only means something against one of them.
- Choose your image. It is opened by this browser tab and measured on a canvas, so the file never leaves the machine you are sitting at and there is no queue or upload to wait for.
- Read the result: an exact match at 1080x1080, the same 1:1 shape at a different scale, or a crop with the axis that loses pixels named.
- If it is wrong, open the Instagram resizer linked underneath. It exports to these exact numbers instead of leaving the decision to the platform.
- Check it against the square as well if yours is an account people browse as a profile, because that grid crop is applied to the same file a second time.
What Instagram does when the shape is wrong
Instagram does not refuse an odd shape. It accepts the file, fits it to the nearest ratio it allows and keeps the middle, which is why the complaint is nearly always about something missing rather than about an error.
- Anything taller than the portrait shape is cropped back to it, and the trim comes evenly off the top and the bottom, which is where captions and logos usually sit.
- Anything wider than the landscape shape is trimmed at both ends, so a panorama arrives as its middle third with the interesting edges gone.
- A file narrower than 1080 pixels is scaled up to reach the canvas and then compressed, and those two passes together are what makes a screenshot look mushy.
When the number is not what is holding the post back
A correctly sized post can still be a bad post, and it is worth saying plainly that the size is the cheapest part of this to get right and the smallest part of what decides whether anybody stops.
- If the subject sits at one edge of the frame, no size on this page saves it. Recompose or crop deliberately before you resize anything.
- Screenshots of text rarely survive the feed at any size, because they are read at about a third of a phone screen. Retype the line into the caption instead.
- Carousels, stories and reels have their own shapes. Sending one square file to all three hands Instagram three separate crop decisions.
The rest of the job
You just fixed one post. Now do the month.
The instagram post size solves one piece of one post. OctoSpark plans, writes and schedules the whole calendar across every network you use, publishes it for you, and reports what actually performed.
- One calendar for every network
- Schedule once, publish everywhere
- Drafts written in your own voice
- See what actually performed
Open the full sign-up page
No card needed. These tools stay free either way.
Related free tools
- Instagram image resizerResize any image to the exact dimensions Instagram expects: square post 1080x1080, plus every other Instagram size. Runs in your browser, nothing uploaded.
- Instagram carousel sizeThe Instagram carousel size is 1080x1350 pixels, a ratio of 4:5. Check every slide in the browser: one odd shape sets the crop for the whole carousel.
- Instagram story sizeThe Instagram story size is 1080x1920 pixels, a ratio of 9:16. Check yours in the browser and see what the profile row and reply bar hide at top and bottom.
- LinkedIn post image sizeThe LinkedIn post image size is 1200x627 pixels, a ratio of 1.91:1. Check yours in the browser and see what the feed trims from a file of a different shape.
Frequently asked questions
How this tool works, what it cannot do, and what happens to what you put into it.
What is the Instagram post size?
1080x1080 pixels, a ratio of 1:1. Instagram also takes 1080x1350 for a taller portrait post and 1080x566 for a landscape one, and all three are downscaled onto the same 1080 pixel canvas on arrival.What if my image is not 1080x1080?
It still posts. Instagram fits whatever arrives to the nearest shape it allows and keeps the middle of the frame, so the risk is not rejection but a crop you did not choose, taken off both edges of the longer axis.Is my image uploaded when I check it?
No. The file is opened by your own browser, measured, and forgotten when you close the tab. It is never sent to us, so there is nothing on our side to keep, leak or delete.Is a square or a portrait post better on Instagram?
Portrait at 1080x1350 takes about a third more vertical screen for the same scroll, which is the argument for it. The square is easier to reuse, because the profile grid crops every post to a square anyway and a square post is already what that grid will show.Is my data private?
Yes. This tool does its work in your browser, so whatever you type, paste or upload stays on your device. Nothing is sent to our servers, which is also why it keeps working if you go offline after the page has loaded.Is this really free?
Yes. Every tool here is free with no account, no credit card and no usage cap. They exist so that the people who need our scheduling product find us, which only works if the tools are genuinely useful on their own.Do I need an account?
No. Open the page and use it. An account is only for OctoSpark itself, where you plan, schedule and publish a whole calendar rather than fixing one post at a time.Can I use the output commercially?
Yes. Anything you produce here is yours, including for client and commercial work. We claim no rights over it and we do not watermark it.