Social Media Image Sizes in 2026 (All Platforms)
The complete 2026 social media image size guide — LinkedIn, Instagram (feed, story, reel), X, and Threads — plus how to export every size from one design.
Post the wrong size and your design gets cropped, blurred, or letterboxed — and the algorithm quietly buries it. Every platform has its own dimensions, and they change. Here’s the current social media image size cheat sheet for 2026, plus how to stop resizing by hand.
Instagram image sizes
- Portrait (4:5) — 1080 × 1350. Best feed reach; use this by default.
- Square (1:1) — 1080 × 1080.
- Story / Reel cover (9:16) — 1080 × 1920.
Portrait takes the most vertical space in the feed, so it’s the highest-performing Instagram post size for most brands.
LinkedIn image sizes
- Square (1:1) — 1080 × 1080. The safest LinkedIn post size for feed.
- Portrait (4:5) — 1080 × 1350. Great for mobile reach.
- Landscape (1.91:1) — 1200 × 628. Best for link previews.
LinkedIn favours square and portrait in-feed; save landscape for shared links.
X (Twitter) and Threads sizes
- X landscape (16:9) — 1200 × 675, the standard in-timeline image.
- X square (1:1) — 1080 × 1080 also works well.
- Threads (1:1) — 1080 × 1080, the safest size for an image attached to a text thread; portrait 4:5 (1080 × 1350) works too.
Threads is text-first, so most posts are the words themselves — attach a square or portrait image when a visual helps the thread land.
Export every size from one design
The real time-sink isn’t knowing the sizes — it’s re-cutting one design into all of them. PostSaaS generates each design in the platform’s native format and re-flows the layout, so a single post exports as a 4:5 feed image, a 9:16 story, and a 16:9 landscape without you resizing anything.
One generation, every size, correctly cropped.
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