Posting the wrong image size is the fastest way to make good content look amateur — cropped faces, blurry thumbnails, stretched banners. Every platform has its own sweet spot. Here is the 2026 cheat sheet, plus the fastest way to hit these sizes.
Quick Reference Table
| Platform | Format | Recommended Size (px) | Aspect Ratio |
| Square post | 1080 x 1080 | 1:1 | |
| Portrait post | 1080 x 1350 | 4:5 | |
| Story / Reel | 1080 x 1920 | 9:16 | |
| YouTube | Thumbnail | 1280 x 720 | 16:9 |
| YouTube | Channel banner | 2560 x 1440 | 16:9 |
| TikTok | Video cover | 1080 x 1920 | 9:16 |
| Shared post | 1200 x 630 | 1.91:1 | |
| X (Twitter) | In-stream image | 1600 x 900 | 16:9 |
| Shared post | 1200 x 627 | 1.91:1 | |
| Standard pin | 1000 x 1500 | 2:3 |
Why These Sizes Matter
Platforms compress and crop anything that does not match their target ratio. Upload a square image as a YouTube thumbnail and it gets letterboxed or cropped — either way, detail is lost. Matching the native ratio means your image displays exactly as you designed it.
How to Resize Without Distortion
The mistake most people make is stretching an image to fit. Instead:
A Note on Resolution and File Size
Bigger is not always better. Most platforms cap upload resolution and re-compress your file anyway. Aim for the recommended dimensions above at a reasonable quality, then compress. A 1080 x 1080 Instagram post around 200–500 KB looks crisp and uploads instantly.
Pro Tips
Bottom Line
Match the platform, crop to ratio, resize to spec, compress, and post. Bookmark this guide and run your images through the free image tools before every upload. Resize an image now →