ToolBox Image — 2026年ソーシャルメディア画像サイズ完全ガイド
プラットフォームごとに異なるサイズ要件があります。Instagram、Facebook、Twitter、LinkedIn、YouTubeの画像サイズの決定版チートシートです。
Getting image dimensions wrong on social media is one of the most common design mistakes. Here is the complete cheat sheet for social media image sizes in 2026.
Square (1080 × 1080) is the most reliable. Portrait (1080 × 1350, 4:5 ratio) takes up more screen space. Landscape (1080 × 566, 1.91:1) works for wide shots. Stories use 1080 × 1920 (9:16).
Feed images display at 1200 × 630 for link previews. Cover photos need 851 × 315 on desktop and 640 × 360 on mobile. Profile pictures display at 180 × 180.
Twitter / X
Images up to 4096 × 4096 and 5 MB. In-stream images display at 1600 × 900 (16:9) for landscape and 800 × 1200 (2:3) for portrait.
Feed images at 1200 × 627 for link previews. Company banner images need 1584 × 396. Profile pictures use 400 × 400.
YouTube
Thumbnails at 1280 × 720 (16:9), under 2 MB. Channel banner images need 2048 × 1152.
Quick reference table
| Platform | Feed image | Cover / Banner | Profile |
|---|---|---|---|
| 1080 × 1080 | — | 320 × 320 | |
| 1200 × 630 | 851 × 315 | 180 × 180 | |
| Twitter / X | 1600 × 900 | — | 400 × 400 |
| 1200 × 627 | 1584 × 396 | 400 × 400 | |
| YouTube | 1280 × 720 | 2048 × 1152 | 800 × 800 |