Social Media Sizes & Dimensions Guide
Always use the right dimensions. Get the latest specifications for all major social media platforms, updated for 2026. Genviral automatically optimizes all your content for every platform.
Browse by Platform
TikTok
Video specifications for viral TikToks, including duration, file size, and aspect ratios.
Reels, Stories, Feed posts, and Carousels - all the Instagram dimensions you need.
YouTube
YouTube Shorts and video specifications for maximum reach and engagement.
Feed, Reels, Stories, and Cover photos - all Facebook dimensions and specs.
Professional content specs for posts, videos, carousels, and company pages.
Pin dimensions for standard, video, Idea, and carousel pins to maximize saves and clicks.
X (Twitter)
Image and video specs for posts, profiles, and link cards on X (formerly Twitter).
Bluesky
Image, video, avatar, and banner specs for posting on Bluesky. Note: Bluesky compresses images and is evolving quickly.
Mastodon
Image, video, avatar, and header specs for Mastodon. Limits are set per server (instance) — defaults shown.
Quick Reference
| Platform | Content Type | Dimensions | Aspect Ratio | Max Size |
|---|---|---|---|---|
| TikTok | Video | 1080×1920 | 9:16 | 287 MB (iOS) / 500 MB (Web) |
| TikTok | Photo / Carousel | 1080×1920 | 9:16 | 20 MB per image |
| TikTok | Stories | 1080×1920 | 9:16 | 72 MB |
| Reels | 1080×1920 | 9:16 | 4 GB | |
| Stories | 1080×1920 | 9:16 | 30 MB (image) / 4 GB (video) | |
| Feed Post (Portrait) | 1080×1350 | 4:5 | 30 MB | |
| YouTube | Video (1080p) | 1920×1080 | 16:9 | 256 GB |
| YouTube | Shorts | 1080×1920 | 9:16 | 256 GB |
| YouTube | Thumbnail | 1280×720 | 16:9 | 2 MB |
| Reels / Video | 1080×1920 | 9:16 | 4 GB | |
| Feed Image | 1080×1350 | 4:5 | 30 MB | |
| Stories | 1080×1920 | 9:16 | 30 MB (image) / 4 GB (video) | |
| Feed Image (Portrait) | 1080×1350 | 4:5 | 5 MB | |
| Feed Image (Landscape) | 1200×627 | 1.91:1 | 5 MB | |
| Video | 1080×1920 | 9:16, 1:1, 16:9, 4:5 | 5 GB | |
| Standard Pin | 1000×1500 | 2:3 | 20 MB | |
| Video Pin | 1000×1500 | 2:3 (or 9:16) | 2 GB | |
| Idea Pin | 1080×1920 | 9:16 | 20 MB (image) / 2 GB (video) | |
| X (Twitter) | Single Image Post | 1600×900 | 16:9 (also 1:1) | 5 MB (photo) / 15 MB (GIF) |
| X (Twitter) | Video | 1280×720 (or 1920×1080) | 16:9 (or 1:1) | 512 MB |
| X (Twitter) | Profile Picture | 400×400 | 1:1 | 2 MB |
| Bluesky | Feed Image | 1200×675 (or 1080×1080) | 16:9 or 1:1 | ~1 MB per image (auto-compressed) |
| Bluesky | Video | 1080×1920 (or 1920×1080) | 9:16 or 16:9 | ~50 MB (approx — verify) |
| Bluesky | Avatar | 1000×1000 | 1:1 | ~1 MB (compressed) |
| Mastodon | Image Post | 1280×720+ recommended | 16:9, 1:1, or original | ~16 MB default (varies by server) |
| Mastodon | Video / GIF | 1280×720 (or 1920×1080) | 16:9 or 1:1 | ~40–99 MB default (varies by server) |
| Mastodon | Avatar | 400×400 | 1:1 | ~2 MB default |
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