The short version: the correct dimensions for an Instagram post are 1080×1080 pixels for square, 1080×1350 for portrait, and 1080×608 for landscape, all uploaded at 1080 pixels wide and never higher. Portrait (4:5) is the format that fills the most screen space in someone’s feed, which is why it tends to outperform the square everyone defaults to. Get the ratio right and Instagram will still recompress your image on upload, so the ratio matters more than chasing a “perfect” pixel count.
The three sizes you need
Instagram supports three aspect ratios for a standard feed post. That’s it. Everything else you’ve read online is a variation on these three:
- Square: 1080 x 1080 px, ratio 1:1
- Portrait: 1080 x 1350 px, ratio 4:5
- Landscape: 1080 x 608 px, ratio 1.91:1
Upload at 1080 pixels wide. Not 2048, not 4000, not “the highest resolution my camera shoots at.” Instagram compresses anything larger down to its own internal size anyway, so sending a huge file just means a longer upload and more chance of the compression algorithm making a mess of fine detail, gradients, and text. I learned this the annoying way after uploading a 4032 x 5040 photo straight from an iPhone for a client’s product launch. It looked fine on my laptop. On their phone the sky in the background had visible banding because Instagram had to squash a much bigger file down hard and fast. Export at 1080 and you hand Instagram less work to do, which means less damage.
Why portrait beats square (the bit most sizing guides skip)
Here’s the uncomfortable part nobody selling you a “perfect Instagram sizes” cheat sheet wants to say out loud: square is the weakest choice of the three, and most brands use it anyway purely out of habit from 2013 when square was the only option Instagram offered.
A 4:5 portrait post takes up roughly 25% more vertical space on a phone screen than a 1:1 square does. More screen space means more time the image sits in someone’s eyeline while they scroll, which means more chance of a thumb stop. I switched my own client accounts from square to 4:5 as the default format across three separate businesses in 2023 and watched average reach per post climb without changing a single thing about the content itself, just the shape of the canvas. Same photos, same captions, same posting times. The only variable was the ratio.
Square still has its place, mostly for grid aesthetics or when you’re posting something that’s symmetrical, like a product flat lay. But if you’re defaulting to square because “that’s what Instagram posts are,” you’re leaving reach on the table for no real reason.
The grid crop nobody warns you about
Whatever ratio you post in, your Instagram grid (the 3-column view on your profile) always displays a cropped square thumbnail. Post a gorgeous 4:5 portrait shot and the grid will still show a square crop of the middle of it. This catches people out constantly, especially with text overlays.
I once designed a carousel for a launch where the headline sat near the top third of a 4:5 slide. It read perfectly in the actual feed. On the profile grid, the crop had sliced clean through the top of the text, so the thumbnail showed half a word. Nobody noticed until a follower screenshotted it and asked what the headline was supposed to say. The fix is simple once you know it exists: keep any text or key subject matter within the centre 1080 x 1080 square of your canvas, even if the full image is 1080 x 1350. Treat the top and bottom strips as safe padding, not prime real estate.
Carousels
Carousel posts (the swipeable multi-image ones) need every slide set to the exact same ratio, or Instagram will crop each one to match the first slide you set. Pick one ratio before you design slide two. 1080 x 1350 (4:5) is the current recommended size for carousels because it gives you the most vertical space to work with across multiple slides, and it’s what most creators, myself included, now default to for tip-style or listicle carousels.
If you mix a square first slide with landscape slides after it, Instagram forces everything into the first slide’s shape and you lose content off the edges of every slide that follows. This is one of the most common carousel mistakes I see when reviewing client accounts, and it’s completely invisible until you post it, because the design tool you built it in (Canva, Figma, whatever) won’t warn you.
Landscape: the format almost nobody should use
1.91:1 landscape exists mostly as a leftover from Instagram’s early days and from repurposed YouTube thumbnails. On a phone feed it takes up the least vertical space of the three ratios, which means the least attention. Unless you’re posting a wide screenshot, a panoramic shot, or repurposing a piece of horizontal video content, there’s rarely a good reason to choose it over portrait. I use it maybe twice a year, usually for a screenshot of a testimonial or a wide before-and-after comparison where the width matters to the story.
File type, colour, and the technical bits people skip
- Export as JPG for photos, PNG only if you have transparency or crisp text/graphics that need to stay sharp.
- Use sRGB colour profile, not CMYK or Adobe RGB. Designers coming from print software get this wrong constantly and wonder why their carefully colour-matched brand graphic looks washed out on Instagram.
- Keep file size under 30MB (Instagram’s hard limit), though realistically a well-compressed 1080px image will land well under 5MB anyway.
- Minimum width Instagram will accept is 320 pixels. Below that, it either rejects the upload or stretches it, and stretched images are obvious and ugly.
Step by step: sizing an image before you upload
- Decide your ratio first: 1:1, 4:5, or 1.91:1. Default to 4:5 unless you have a specific reason not to.
- Set your canvas to 1080 x 1080, 1080 x 1350, or 1080 x 608 in whatever design tool you use.
- Keep any text, faces, or key subject matter inside the centre safe zone, roughly the middle 80% of the canvas.
- If it’s a carousel, lock every slide to the same canvas size before you design slide two.
- Export as JPG, sRGB, and check the file is under 5MB.
- Preview it on an actual phone before posting, not just on your laptop screen. Colours, cropping, and text legibility all read differently on a 6-inch screen than a 27-inch monitor.
Profile picture and other sizes worth knowing
Your profile picture uploads best at 320 x 320 pixels minimum, and Instagram displays it as a circle, so keep your logo or face centred and away from the edges. A square logo with important detail right in the corners will get chopped off by the circular crop, which is a mistake I still see on business accounts every week.
If you’re also posting Reels or Stories, the dimensions are completely different from feed posts, both use a 9:16 vertical ratio at 1080 x 1920, and the details around safe zones and export settings matter enough that I’ve written full breakdowns on the correct Instagram Reels aspect ratio and the correct size ratio for an Instagram Story separately, because trying to cover all four formats in one post makes none of them useful.
When the dimensions are right but the post still looks bad
Getting the pixel size correct solves maybe half the quality problem. The other half is compression, and it catches out people who did everything else right. If your Story or Reel looks fuzzy despite exporting at the correct resolution, the cause is almost always Instagram’s own re-encoding rather than your original file, and I’ve gone through exactly why and how to minimise it in why your Instagram Story looks blurry. The same compression logic applies to feed posts: a correctly sized image with too much fine detail, tiny text, or heavy gradients will still get chewed up on upload. Simpler graphics with bold, larger elements survive compression far better than intricate ones, regardless of how perfectly you nailed the pixel dimensions.
A quick reality check on how much this matters
Sizing is a foundation, not a strategy. I’ve seen accounts obsess over pixel-perfect graphics while posting three times a month, and I’ve seen scrappy, slightly-off-ratio posts from accounts that show up daily and grow steadily anyway. Consistency and content quality do more heavy lifting than dimensions ever will. If you’re trying to work out how often to post rather than just how big to make each image, that’s a separate question worth answering, and I’ve covered the posting frequency side of this in how many Instagram Reels you should post to grow your audience, which applies to the same logic for feed content too.
If a full list of every Instagram fix and setting in one place would save you time, I’ve pulled the whole lot together, sizing included, over on the Instagram help hub.
Frequently asked questions
What is the best Instagram post size for 2026?
1080 x 1350 pixels (4:5 portrait) is the best general-purpose Instagram post size right now because it fills more of the phone screen than a square, which tends to hold attention longer while scrolling. Square (1080 x 1080) still works well for grid-heavy aesthetic accounts, and landscape (1080 x 608) is only worth using for wide content like screenshots or panoramas.
Does Instagram crop my post if I upload the wrong size?
Yes. If your image doesn’t match one of Instagram’s three supported ratios (1:1, 4:5, 1.91:1), Instagram will automatically crop it to the nearest one, and it usually crops from the centre outward, which can cut off text or faces near the edges. Always design within the correct ratio yourself rather than letting Instagram decide.
Should I upload higher than 1080 pixels for better quality?
No. Instagram compresses everything down to its own internal size regardless of what you upload, so sending a file larger than 1080 pixels wide just adds upload time without improving quality, and can occasionally make compression artefacts worse on very high-resolution source files.
Why does my Instagram grid show a cropped version of my post?
The grid view on your profile always displays a square thumbnail crop, even if you posted in 4:5 or 1.91:1. Instagram takes the centre portion of the full image for the thumbnail, so keep important text or subjects within the centre square of your canvas to avoid them being cut off in the grid preview.
