Social Media Specs
Social Media Image Sizes and Specs Cheat Sheet (2026)
One table of the sizes and limits that trip up scheduled posts: the best image size, caption length, video length, and carousel count for each major network. Every figure comes from the platform's own documentation, checked September 2026, and each network links to a full page of specs.
Updated
Cheat Sheet
| Network | Go-to size | Text limit | Video length | Multiple media |
|---|---|---|---|---|
| 1080 x 1350 (4:5), feed portrait | 2,200 characters | 3 seconds to 15 minutes | Up to 10 images, videos, or a mix | |
| 1080 x 1920 (9:16), reel | 63,206 characters | 3 to 90 seconds | Up to 10 photos in Markaestro | |
| TikTok | 1080 x 1920 (9:16), video or photo | 2,200 characters | Up to 10 minutes via the API; each account has its own cap (3, 5, or 10 minutes) | Up to 35 images in Markaestro |
| 1080 x 1080 (1:1), feed square | 3,000 characters | 3 seconds to 30 minutes | Up to 20 images in Markaestro | |
| Threads | 1080 x 1350 (4:5), image | 500 characters | Up to 5 minutes | 2 to 20 items |
| 1000 x 1500 (2:3), standard pin | 100 characters; 800 characters (Markaestro checks captions against 500) | 4 seconds to 15 minutes | 2 to 5 images, 1:1 or 2:3, 20 MB each | |
| X | 1280 x 720 (16:9), landscape video | 280 characters on a standard account | 0.5 seconds to 20 minutes (longer for Premium) | Up to 4 images, 1 GIF, or 1 video |
One Export That Works Almost Everywhere
A 1080 x 1350 (4:5) image is inside Instagram's feed range, Threads' width range, and LinkedIn's pixel limit, so one export covers all three feeds. Vertical 1080 x 1920 (9:16) covers Reels, Stories, TikTok, Facebook Reels, and Threads video. Pinterest prefers 2:3 (1000 x 1500), and X recommends 1280 x 720 for landscape video.
Caption Limits at a Glance
| Network | Caption or post text |
|---|---|
| Caption: 2,200 characters | |
| Post text: 63,206 characters | |
| TikTok | Caption: 2,200 characters |
| Post text: 3,000 characters | |
| Threads | Post text: 500 characters |
| Title: 100 characters; Description: 800 characters (Markaestro checks captions against 500) | |
| X | Post text: 280 characters on a standard account |
Check a caption against all of them at once with the character counter.
Frequently Asked Questions
What image size works on every social network?
No single size is ideal everywhere, but 1080 x 1350 (4:5) fits Instagram, Threads, and LinkedIn feeds, and 1080 x 1920 (9:16) fits Reels, Stories, TikTok, and Facebook Reels.
Which network has the shortest caption limit?
X, at 280 characters on a standard account. Threads allows 500 and Pinterest descriptions 800.
How often do these specs change?
Platforms revise limits a few times a year. This page shows the date each figure was last checked against the official documentation.
Sources
- Meta: Instagram Platform, IG User Media reference
- Meta: Video API, Reels publishing
- TikTok for Developers: Content Posting API media transfer guide
- Microsoft Learn: LinkedIn Images API
- Microsoft Learn: LinkedIn Videos API
- Meta: Threads API overview
- Pinterest Help: Pinterest product specs
- X Developer Platform: media best practices