Choosing Collage Sizes for Social Media Posts
A collage that looks good in the editor still needs to survive feeds, thumbnails, previews, and mobile screens.
Square is the safest starting point
Square exports are predictable and work well for many social feeds. They are especially useful for grid collages and balanced product collections.
The tradeoff is that vertical photos may need more cropping. Keep important subjects away from the very top and bottom edges.
Portrait gives more screen presence
Portrait images occupy more mobile screen space and can make a post feel more immersive. They are good for tutorials, outfits, product collections, and travel stories.
Because portrait layouts are taller, visual hierarchy matters more. Put the most important image near the top rather than hiding it below the fold.
Landscape works for headers and reports
Landscape collages fit banners, presentation visuals, blog headers, and comparison images. They are less dominant in vertical feeds but very useful in documents.
When using landscape, keep text and fine detail large enough for mobile previews.
Design for the preview, not only the post
Many users first see a collage as a feed preview, profile grid tile, message attachment, or search result thumbnail. The preview size determines whether they stop scrolling.
Keep the main subject away from edges that platforms may crop. Even if the full image is preserved, previews often crop differently.
If the collage includes text, make one version with larger text for social media rather than reusing a dense document graphic.
Create platform-neutral assets
When you do not know every destination, create a strong square master first. From there, crop or extend into portrait and landscape versions.
Keep background areas simple near the edges. This makes it easier to adapt the same collage to different aspect ratios without cutting important content.
Save the final export settings with the campaign notes. Reusing consistent ratios helps a brand feed look intentional over time.
Practice exercise: export for three surfaces
Take one collage and export a square feed version, a portrait story version, and a landscape header version. Keep the same images but change crop and spacing for each surface.
Compare where the main subject lands in every version. If the subject sits too close to an edge in one format, build that version separately rather than relying on automatic platform cropping.
This exercise also reveals which images are flexible. A photo that only works in one ratio may be a poor anchor for campaigns that need multiple placements.
Applying the guide to multi-platform reuse
A social image often travels farther than planned: feed, story, message preview, profile grid, newsletter, or website card. Build versions intentionally instead of relying on one export everywhere.
Keep the subject and important text inside a safe central area. This gives the collage a better chance of surviving platform-specific crop behavior.