Instagram built its early identity around square photos and 640x640 was the standard display resolution for posts on the platform for several years before it shifted to supporting multiple aspect ratios. A lot of social media scheduling tools, content planning apps and older export presets still default to this size for square social content. Profile photos on certain platforms also display at or near this dimension. When a workflow or a platform specifically calls for 640x640, having a reliable way to hit that exact size without guessing is what matters.
How to Resize an Image to 640x640
Enter 640 in both the width and height fields. Turn the Maintain Aspect Ratio checkbox off for a forced square output. With it on and a non-square original, one side reaches 640 while the other follows the original proportions, so the output will not be a clean square.
For social media content where the subject needs to stay centered in the frame, preparing the image as a square before uploading gives a cleaner result. Content with the main subject centered looks intentional at this size. A landscape photo forced into a square without centering tends to cut off important content on the sides. Upload multiple images at once and download as a ZIP when done.
Common Uses for 640x640 Images
Social media content schedulers and export tools that predate Instagram's support for non-square formats still output square posts at 640x640 as a default preset. Content batches prepared for older automated posting workflows often need images at this exact size to pass through the system without triggering a resize at the platform end.
Profile photos on platforms that display at a mid-range square size also benefit from being prepared at 640x640. The image holds enough resolution to look sharp on standard displays while staying small enough to upload quickly across multiple platforms.
Output Format at This Size
JPEG handles photographic social media content well at 640x640 and keeps file sizes manageable for fast uploads. PNG is the better choice for graphic content, illustrated posts and anything with text overlays where clean edges matter more than file size. WEBP works well if the images are also going to be used on a website where loading speed is a consideration.