Best image sizes for social media (2026 guide)

A practical reference · Updated June 9, 2026

Posting an image at the right size is one of the quickest wins in social media. Upload something too small and it looks soft and pixelated; upload something the wrong shape and the platform crops off the part you cared about. The dimensions below reflect commonly cited, widely recommended sizes as of mid-2026. Treat them as solid defaults rather than fixed rules — platforms tweak their layouts often, so it is always worth checking the current help docs before a big campaign.

Recommended dimensions by platform

All sizes are in pixels, written as width × height. When in doubt, upload at the larger end of the range: platforms downscale gracefully but never add detail that was not there to begin with.

Aspect ratio matters more than exact pixels

Most platforms care about the shape of your image more than its precise pixel count. If you match the recommended aspect ratio — 1:1 for a square, 4:5 for an Instagram portrait, 16:9 for a YouTube thumbnail — your image fits the frame and nothing important gets cut off. Get the ratio wrong and the platform will crop to fit, often from the centre, which is how heads, logos and captions end up clipped. Decide on the ratio first, then scale to the pixel size in the table.

Crop vs resize — they are not the same

It helps to know which tool you actually need. Resizing changes how many pixels an image has while keeping its proportions, so a 4000 × 3000 photo becomes 1080 × 810 with the same content, just smaller. Cropping changes the shape by cutting pixels away, which is what you do to turn a wide landscape photo into a 1:1 square or a 9:16 story. A typical workflow is to crop to the target ratio first, then resize down to the recommended dimensions. Our free image cropper handles the framing and the image resizer nails the exact pixel size — both run entirely in your browser.

Keep file size small for speed

Sharp dimensions are only half the job. Oversized files make pages and feeds load slowly, and some platforms re-compress heavy uploads aggressively, which can actually hurt quality. Export at the dimensions you need rather than uploading a 12-megapixel original, and compress before you post. For photos, JPG or WebP at around 80% quality usually looks indistinguishable from the original at a fraction of the size. You can shrink any image with our private image compressor before sharing it.

A few practical tips

• Design for the smallest view. Many people see your post on a phone, so keep text large and avoid placing key details near the edges where crops happen.
• Use the highest quality source you have. Scaling down looks great; scaling a small image up never does.
• Mind safe zones. Profile photos are masked into circles, and cover photos render differently on desktop and mobile — leave breathing room around important elements.
• Re-check before campaigns. These numbers shift over time. Confirm against the platform's own current guidance when it really counts.

Privacy note: every Imagloo tool processes your pictures locally using your browser's built-in image tools. Your files are never uploaded to a server, so you can prep client work, personal photos and unreleased graphics without anything leaving your device.

Try it — free and in your browser

Get your images to the perfect size with these free, private Imagloo tools (nothing is ever uploaded):

• Image Cropper — crop to 1:1, 4:5, 9:16 or any custom ratio.
• Image Resizer — scale to an exact pixel width and height.
• Image Compressor — shrink file size so posts load fast.