The Social Media Image Sizes Guide You Read Last Year Is Wrong Now

Most "social media image size" guides floating around right now are copy-pasted from 2022. That's a problem, because the actual defaults changed — and if you're still cropping everything to a square, you're fighting the algorithm instead of working with it.

Here's what's actually current, platform by platform, and what to do about it in the next five minutes.

Square is no longer the safe choice

For years, 1:1 square was the "works everywhere" answer. It doesn't anymore. Instagram rolled out a taller profile grid built around a 3:4 ratio, and the platform now visibly favors 4:5 portrait posts (1080×1350px) in the feed over square ones. Facebook and LinkedIn followed the same shift in their own feed layouts.

The practical effect: a square photo now gets cropped or padded on the sides on several platforms, instead of filling the frame the way it used to. If your last batch of posts still uses 1080×1080, that's the first thing to fix.

The actual numbers, by platform

• Instagram — Feed post: 1080×1350px (portrait, now the default choice); square 1080×1080px still works but shows smaller. Stories/Reels: 1080×1920px. Profile picture: 320×320px.
• Facebook — Feed post: 1080×1350px (portrait) or 1200×630px (link/horizontal). Cover photo: 851×315px on a profile, 1640×856px for a group. Profile picture: 320×320px.
• X (Twitter) — In-stream image: 1600×900px (16:9) reads best on both mobile and desktop. Header banner: 1500×500px. Profile picture: 400×400px.
• LinkedIn — Feed post: 1080×1350px (portrait) or 1080×1080px (square). Cover photo: 1584×396px for a personal profile. Profile picture: 400×400px.
• TikTok — Video/cover image: 1080×1920px, no exceptions — anything else gets letterboxed. Profile picture: 200×200px minimum.
• YouTube — Thumbnail: 1280×720px. Channel banner: 2560×1440px.

Keep this list open next to whatever you're editing in. It's the version that matches what each platform is rendering right now, not what they rendered two years ago.

The math behind why this actually matters

1080×1350 isn't just "a slightly taller square" — it's a 4:5 ratio, meaning the image takes up roughly 78% more vertical space on a phone screen than a 1080×1080 square does. On a feed where people are scrolling with their thumb, more vertical real estate means your post stays on screen longer before it gets scrolled past. That's the entire reason platforms started favoring it — not aesthetics, just watch time per post.

The same logic is why TikTok and Reels are strict about 9:16. A video that isn't shot vertically gets pillarboxed with black bars on both sides, which shrinks the actual content to a fraction of the screen and tanks watch time before the algorithm even gets a chance to push it further.

Why the square habit is hard to break

Most people don't upload the wrong size on purpose — they reuse an old template, or their phone's camera app defaults to square, or a tool they used years ago baked 1:1 into a preset that never got updated. None of that is a workflow problem you need to fully rebuild. It's a five-second habit to swap.

The one thing worth actually changing is your export default. If your editing app or camera lets you set a default aspect ratio, set it to 4:5 for feed content and 9:16 for anything going to Stories, Reels, or TikTok. Everything downstream gets easier once that's the starting point instead of something you fix after the fact.

A second common mistake: resizing a photo by just stretching it to the new dimensions. Stretching 1080×1080 into 1080×1350 distorts faces and straight lines — anyone scrolling past will clock it as "off" even if they can't say why. The fix is padding or re-cropping the image to the new ratio, not stretching the pixels that already exist.

Fixing an image you already have

You don't need Photoshop for this. If a photo is already shot square or in the wrong ratio, an image resizer will get it to the right pixel dimensions without you eyeballing a crop box. If the file is also too heavy to upload cleanly, run it through an image compressor first — most platforms silently re-compress oversized files anyway, and you'll get a cleaner result controlling that yourself. Both run in the browser, so nothing gets uploaded anywhere just to resize it.

The five-minute fix

1. Pick your platform from the list above.
2. Match the pixel dimensions, not just the aspect ratio — 1080×1350 and 1080×1080 both round to similar ratios on a small preview, but they render differently in-feed.
3. Resize before you compress, not after — compressing a wrongly-sized image just gives you a smaller wrong-sized image.
4. Set your camera or editing app's default to match, so this isn't a decision you make every time you post.

That's the whole fix. The numbers change every year or two — when they do, the square habit is usually the first thing worth checking.