If you post images anywhere, you have run into this. The photo that looked perfect on Instagram gets awkwardly cropped on Twitter, your face ends up half cut off in a banner, or an image turns soft and stretched because the platform resized it to fit. Every service has its own preferred dimensions, and there are a lot of services, so it is easy to assume you need to memorise an endless list of numbers.
You do not, and that is what this guide is really about. There is one idea that makes almost all of these sizes make sense at once, and once it clicks you can stop guessing. We will start with that idea, then I will give you the full reference table to keep for the exact pixels.
Aspect ratio matters more than exact pixels
The thing that actually decides whether your image fits is its aspect ratio, the shape of the rectangle, not the precise pixel count. Here is why that matters: when you upload an image whose ratio matches the slot, the platform simply scales it to fit and everything stays intact. When the ratio is wrong, the platform has to crop or pad it to force it into the space, and that is when faces get chopped and edges vanish. Get the shape right and most of your problems disappear.
So before you worry about exact dimensions, get the ratio right. Landscape 16:9 covers YouTube and most web and video use. The 1:1 square is the classic feed post. The 4:5 portrait takes up more height in a phone feed, which is why it performs well there. And 9:16 is the full-screen vertical of stories, reels, and short video. Crop your image to the right shape first, and the resize afterwards is trivial.
The full size reference
With the shapes understood, here are the current pixel dimensions worth keeping. These are the sizes to aim for as of 2026. They shift occasionally, but uploading at these gives you a crisp result with room to spare.
| Platform | Image | Size (px) | Ratio |
|---|---|---|---|
| YouTube | Thumbnail | 1280 x 720 | 16:9 |
| YouTube | Channel banner | 2560 x 1440 | 16:9 |
| Square post | 1080 x 1080 | 1:1 | |
| Portrait post | 1080 x 1350 | 4:5 | |
| Story / Reel | 1080 x 1920 | 9:16 | |
| TikTok | Video / cover | 1080 x 1920 | 9:16 |
| X (Twitter) | In-feed image | 1600 x 900 | 16:9 |
| X (Twitter) | Header | 1500 x 500 | 3:1 |
| Shared image | 1200 x 630 | 1.91:1 | |
| Cover photo | 851 x 315 | 2.7:1 | |
| Shared post | 1200 x 627 | 1.91:1 | |
| Profile banner | 1584 x 396 | 4:1 | |
| Standard pin | 1000 x 1500 | 2:3 | |
| Twitch | Profile banner | 1920 x 480 | 4:1 |
| Twitch | Profile picture | 512 x 512 | 1:1 |
You do not need to act on all of these, only the ones you actually post to. Bookmark the row you need and move on.
How to hit these sizes in two steps
Knowing the numbers is only useful if hitting them is easy, and it is. The process is the same every time, and it follows directly from the ratio idea above. First, crop your image to the right shape for where it is going, so nothing important gets chopped when the platform displays it. Our crop tool lets you crop to a set ratio, which is exactly what you want here. Second, resize the cropped image to the target pixel dimensions from the table, which our image resizer does in a couple of clicks. Crop for the shape, resize for the pixels, export. That is the whole workflow.
A few gotchas worth knowing
Two small things cause most of the remaining trouble. The first is safe zones. On banners and cover images, part of the picture is often hidden behind a profile photo or a button, or trimmed differently on mobile and desktop, so keep anything important, text or a face, away from the corners and edges. The second is file size, which is separate from dimensions: even a correctly sized image can be a heavy file, and some platforms compress heavy uploads aggressively, which softens them. Exporting a sensibly compressed image keeps it sharp and fast.
That is genuinely all there is to it. The shapes do the heavy lifting, the table handles the exact numbers, and a quick crop-then-resize gets you there. Keep this page handy, and the next time a platform mangles your image, you will know it was the ratio, and exactly how to fix it.
