If you only post on one platform, you can ignore everything below. If you post the same photo on a feed, a story, a LinkedIn update, and a Pinterest board, you've already noticed: every platform crops it differently. Heads get cut off. Captions disappear. The same image feels good on one network and broken on the next. Here's why, and the eight sizes that actually matter in 2026.
Why each platform has its own size
Aspect ratios aren't arbitrary. Each one is shaped by where the photo will be seen and on what device.
Vertical (9:16) exists because phones are held vertically. Stories, Reels, TikTok, Shorts — all designed to fill the screen of a phone in portrait orientation, full bleed.
Square (1:1)was Instagram's original constraint from 2010 — the same dimensions as a Polaroid. The feed still defaults to square previews because they crop predictably regardless of the source aspect.
Landscape (16:9) exists because computers and TVs are landscape. X (Twitter) renders inline cards at 16:9. YouTube uses it because every TV does.
Wide (4:1, 3:1) exists for banners — the strips of space at the top of a LinkedIn profile, Twitter profile, YouTube channel. These are usability decisions, not photographic ones.
The eight sizes that matter in 2026
Instagram Post — 1080 × 1080 (1:1)
The default square. Renders pixel-perfect on every device. If you're only making one size, make this one. Aspect-safe for both feed and profile grid.
Instagram Portrait — 1080 × 1350 (4:5)
Takes up more screen real estate in the feed. The reason "tall" Instagram posts feel more impactful. Most editorial accounts have switched to this as the default.
Instagram Story / Reels — 1080 × 1920 (9:16)
Full-bleed vertical. Critical thing to remember: Instagram puts the username and profile pic in the top ~5% and interactive elements in the bottom ~12%. Don't put text or key subjects in those zones.
X (Twitter) Post — 1600 × 900 (16:9)
Renders inline at 16:9 regardless of source. Vertical photos get cropped to a 16:9 center box, which usually removes the top and bottom of the image. Pre-cropping to 16:9 is the only way to control what survives.
LinkedIn Banner — 1584 × 396 (4:1)
The widest standard. Hard to use for a single photo because the narrow vertical means most subjects don't fit. Best paired with a landscape composition (skyline, ocean, a row of objects) or a heavy background-blur fill.
Facebook Post — 1200 × 630 (1.91:1)
Same aspect as Open Graph card preview, so it's also the right size for link-card thumbnails on most platforms. Pin it: 1.91:1 is the canonical "preview card" ratio for the modern web.
Pinterest Standard — 1000 × 1500 (2:3)
Pinterest rewards tall images. The 2:3 ratio is the longest the algo will reliably show without truncating. Going taller (1:2 or longer) sometimes gets pins clipped.
YouTube Thumbnail — 1280 × 720 (16:9)
Same aspect as the video. Critical for click-through. The center of the image is what survives across mobile (small thumbnail) and desktop (larger preview). Important faces and text need to live in the center 60% of the frame.
The cropping headache
You have one good photo. You want to post it on Instagram, X, and LinkedIn. The photo is 4032×3024 from your phone — almost 4:3, useless for any of those platforms without cropping.
Before, this meant opening Photoshop or Lightroom three times, eyeballing each crop, exporting at three different pixel dimensions. Or using each platform's built-in editor and accepting whatever it decided.
Or using PixMojo's Social Crop tool: pick a platform preset, drag the photo to position what survives, download at the exact pixel size. Repeat for the next platform. Three outputs in about 30 seconds.
If part of your photo doesn't fill the crop area — say a vertical portrait being squeezed into a LinkedIn banner — the tool fills the empty space with either a blurred copy of the photo itself, solid white, or solid black. The blurred-fill option works for almost any image and looks polished.
The deeper read
Each platform's aspect ratio is a small UX decision that ripples all the way down to how you frame photos at the moment you shoot them. That's why pros frame for the widest possible crop and let the edges go — they know the photo will live on five different surfaces and the safe zone is the center 60%.
You can't fight the platforms. You can shoot loose, pre-crop deliberately, and stop letting Instagram decide what your photo looks like.