Every platform crops your image to its own shape, and if you do not choose the crop, an algorithm chooses it for you, usually through the middle of someone’s face. The fix is one habit: crop to the destination’s aspect ratio before uploading. This guide collects the sizes that matter in one table and explains the two ideas, ratio and resolution, that make all of them easy. Our free crop tool does the cutting in your browser, no upload, no watermark.
In this guide
Aspect ratio vs resolution: the only theory needed
Two numbers describe every image slot. The aspect ratio is the shape: 1:1 square, 16:9 widescreen, 9:16 vertical. The resolution is the pixel count: 1080 × 1080, 1280 × 720. Platforms enforce the shape and are flexible about the pixels: upload the right ratio at generous resolution and the platform rescales gracefully; upload the wrong ratio and something gets cut or letterboxed without your input. So the crop decision is really a ratio decision, and the recommended resolutions in the table below are simply comfortable sizes that survive the platform’s re-encoding looking sharp. One warning runs the other way: never upscale a small image to hit a recommended size, because invented pixels look like invented pixels. Crop, yes; inflate, no.
The sizes table
| Destination | Ratio | Recommended pixels |
|---|---|---|
| Instagram post (square) | 1:1 | 1080 × 1080 |
| Instagram post (portrait) | 4:5 | 1080 × 1350 |
| Instagram Story / Reel cover | 9:16 | 1080 × 1920 |
| YouTube thumbnail | 16:9 | 1280 × 720 |
| YouTube channel art | 16:9 canvas | 2560 × 1440 (see safe area below) |
| X (Twitter) post image | 16:9 | 1600 × 900 |
| X header | 3:1 | 1500 × 500 |
| Facebook cover | about 2.7:1 | 851 × 315 |
| LinkedIn post image | about 1.91:1 | 1200 × 627 |
Platforms adjust their recommendations occasionally, but the ratios are long-lived: 1:1, 4:5, 9:16, and 16:9 cover most of social media between them, and a photo cropped to the right ratio survives a platform’s pixel-size tweaks untouched. Worth knowing for feeds specifically: Instagram’s 4:5 portrait occupies the most screen per post, which is why it quietly became the default of people who think about such things.
Safe areas: where interfaces eat your image
Some slots display differently on different devices, and the edges are the casualty:
- YouTube channel art is the extreme case: you upload 2560 × 1440, but televisions see all of it, desktops see a wide strip, and phones see only the central 1546 × 423 region. Anything essential, name, slogan, faces, belongs inside that core rectangle.
- Stories and Reels overlay interface elements along the top and bottom, profile name above, caption and buttons below. Keep text and faces in the middle band of the 9:16 frame and nothing important gets covered.
- Headers and covers get cropped differently between desktop and mobile, so centered subjects survive while edge-placed logos gamble.
A crop workflow that takes one minute
- Fix orientation first. A sideways photo crops wrong in every ratio; one click in the rotate tool beats fighting the crop box.
- Crop to the destination ratio in the crop tool (or the WebP crop tool for WebP files), composing for the safe area where one applies.
- Then compress for upload, using the sweet-spot settings from our compression guide. Crop before compress: there is no reason to spend bytes on pixels the crop will remove.
- Keep the original. Every platform wants a different rectangle of the same photo; the uncropped master is what makes that free.
For the format side of the upload, what survives re-encoding best and when WebP earns its keep, see the image formats pillar.
Frequently asked questions
What happens if I upload the wrong aspect ratio?
The platform decides for you: center-crop is the common default, letterboxing the polite alternative, and an algorithmic “smart crop” the wildcard. All three are worse than the thirty seconds of choosing your own rectangle.
Are these pixel sizes mandatory?
No, the ratio is the hard requirement. Larger uploads in the right ratio are rescaled cleanly; the listed sizes are comfortable minimums that stay sharp after the platform’s own compression pass.
Why does my thumbnail look blurry after upload?
Platforms re-encode aggressively. Upload at or above the recommended size, with text large and high-contrast; fine detail and thin fonts are what platform compression destroys first.
Should I crop or resize to change the shape?
Only cropping changes shape honestly. Resizing to a different ratio stretches or squashes the content, and faces notice immediately. Resize changes how big, crop changes what is shown; the two jobs compose but never substitute.