Post an image at the wrong size and every platform will do something you did not want — crop your subject's head off, squash the picture, or compress it into a blurry mess. Getting the dimensions right before you upload is the single easiest way to make your posts look sharp and professional. This guide lists the ideal sizes for every major platform in 2026 and explains the two rules that matter more than any specific number.
Two rules that matter more than the numbers
Before the list, understand what is actually going on. First, platforms care about aspect ratio (the shape) even more than exact pixels. If your ratio matches, the platform scales the image cleanly; if it does not, it crops or letterboxes. Second, always upload at the correct size or slightly larger, never smaller — enlarging a small image adds blur, while a slightly oversized image is scaled down cleanly. Get the ratio right and the resolution high enough, and you will look good everywhere. Use the Social Media Image Resizer to hit an exact size for any platform in one click.
- Square post: 1080 × 1080 px (1:1).
- Portrait post: 1080 × 1350 px (4:5) — this takes up the most feed space and is the best-performing format.
- Landscape post: 1080 × 566 px (1.91:1).
- Stories & Reels: 1080 × 1920 px (9:16) — full vertical screen.
- Profile picture: at least 320 × 320 px, displayed as a circle, so keep the subject centred.
Designing a post from scratch? The Instagram Post Generator creates correctly sized square and portrait graphics with text, so you never have to guess the canvas.
YouTube
- Thumbnail: 1280 × 720 px (16:9) — the most important image on the platform; keep text large and readable at small sizes.
- Channel banner: 2560 × 1440 px, but keep essential content in the central "safe area" of about 1546 × 423 px, since the banner is cropped differently on TV, desktop and mobile.
- Profile picture: 800 × 800 px, shown as a circle.
- Feed post (landscape): 1200 × 630 px (1.91:1).
- Square post: 1080 × 1080 px.
- Stories: 1080 × 1920 px (9:16).
- Cover photo: 851 × 315 px on desktop.
- Profile picture: 320 × 320 px minimum.
- Feed post image: 1200 × 1200 px (square) or 1200 × 627 px (landscape).
- Personal cover / banner: 1584 × 396 px (4:1).
- Company page cover: 1128 × 191 px.
- Profile picture: 400 × 400 px, shown as a circle.
X (formerly Twitter)
- In-stream image: 1600 × 900 px (16:9) displays best in the timeline.
- Header/banner: 1500 × 500 px (3:1).
- Profile picture: 400 × 400 px, shown as a circle.
- Status: 1080 × 1920 px (9:16), like a story.
- Profile picture: 640 × 640 px, shown as a circle — centre your subject.
Why aspect ratio beats resolution
It is tempting to obsess over exact pixel counts, but the shape of your image is what actually determines whether it displays well. Every platform scales your upload to fit its display slot, and modern screens have such high pixel density that a 1080-pixel-wide image looks crisp almost everywhere. What platforms will not do gracefully is change your image's proportions — so a photo shot at 4:3 dropped into a 1:1 slot gets its sides or top-and-bottom cropped, often through the most important part of the picture. This is why the same photo can look perfect on one platform and badly cropped on another: the ratio changed. Decide the ratio your subject needs (portrait for people, landscape for scenery, square as a safe all-rounder) and compose with a little breathing room around the edges so a crop never clips anything vital.
Vertical is winning
If there is one trend that has reshaped social imagery, it is the shift to vertical. Stories, Reels, Shorts and TikTok all live in 9:16 full-screen vertical, and feeds increasingly favour tall 4:5 posts because they occupy more of a phone screen as someone scrolls. The practical implication is that if you are shooting or designing for social, default to portrait or vertical rather than the landscape orientation cameras traditionally encouraged. A landscape photo shown in a vertical feed is small and easy to scroll past; the same scene shot vertically fills the screen and stops the thumb. When in doubt, shoot vertical and crop down for the platforms that want a square or landscape version — it is easier to crop a tall image than to invent extra height for a wide one.
File format for social
Use JPG for photographs and PNG only when you need transparency or perfectly sharp text and lines (like a logo overlay or an infographic). Most platforms re-encode whatever you upload into their own format anyway, so there is little point uploading a giant PNG of a photo — it just gets compressed harder. A good-quality JPG at the right dimensions gives the platform the least excuse to soften your image. For graphics with big flat areas of colour and crisp edges, PNG keeps them clean; for anything with a person, a place or a product photo in it, JPG is the right choice.
Two things that ruin a good image
Even at the right size, two mistakes are common. The first is ignoring the safe area on banners and profile pictures. Circular crops (every profile photo) chop off the corners, and banners are cropped differently on each device, so keep faces, logos and text well inside the centre. The second is letting the platform compress a huge file: uploading a 10 MB image forces the platform's own aggressive compression, which softens it. Compress it yourself first with the Image Compressor to a sensible size (usually a few hundred KB), and the platform will leave it largely alone — so it stays sharp.
The one-tool workflow
You do not need a design app for any of this. Start with the highest-quality original you have, use the Image Resizer to set the exact dimensions for your target platform (it keeps the aspect ratio so nothing stretches), then compress lightly before uploading. For platform presets, the Social Media Image Resizer already knows every size above, so you can pick "Instagram portrait" or "YouTube thumbnail" and export instantly. Everything runs in your browser, so your images are never uploaded to a third-party server.
Key takeaways
- Match the platform's aspect ratio first; exact pixels matter less than the shape.
- Upload at the correct size or slightly larger — never smaller, which causes blur.
- Keep faces, text and logos inside the safe area for circular crops and banners.
- Compress the image yourself before uploading so the platform doesn't soften it.