Sprout Social outlines image sizing guidance for 2026

Marketers looking for a single image format across several social platforms can start with a 1080-by-1080-pixel square, according to Sprout Social’s image-size guide. The guide says that size works for standard feed posts on Instagram, Facebook, LinkedIn, Bluesky and Threads without automatic cropping. It was last updated on October 15, 2026.

The recommendation offers a starting point rather than a replacement for platform-specific requirements. Social networks use different dimensions, aspect ratios and file limits for images, including profile pictures, cover images and posts. Checking those requirements matters because a platform may alter how an image appears when a file does not match its specifications.

Sprout Social identifies several possible consequences of a sizing mismatch. Cropping can cut off text or logos near an image’s edges, while compression can make fine details look less sharp. An unsuitable aspect ratio can also leave empty space around a visual, and some uploads may be rejected altogether.

Publishing through a scheduling tool adds another consideration. These tools use platform APIs, which the guide says can impose tighter limits than the apps themselves. Instagram’s API, for example, accepts feed images with aspect ratios from 4:5 through 1.91:1; images outside that range are not accepted.

The guidance is relevant to brands that rely on static visuals as part of their content mix. Sprout Social’s 2025 Content Benchmarks Report found that images made up 48% of brand content on Facebook. The company also points to its free Landscape tool, which can resize one image for use across social media sizes.

What this means for marketers

Use the square format as a starting point for standard feed content across the five platforms named in the guide, then check the specifications for each intended placement. Before scheduling, verify that the image also meets the relevant API limits. Reviewing the edges and text after resizing can help identify cropping or loss of detail before publication.