The 1080x1350 pixel dimension is the optimal Instagram portrait post size. With a 4:5 aspect ratio, portrait posts take up more vertical space in the Instagram feed than any other post format, making them the best choice for maximizing engagement and visibility.
Compared to square posts (1080x1080) that show 1080 pixels of vertical space, portrait posts display 1350 pixels of height. This 25% increase in screen real estate means your content occupies more of the viewer's screen as they scroll, increasing the chance they stop and engage with your post.
Instagram allows portrait posts up to a 4:5 ratio. Anything taller than 1080x1350 will be cropped by Instagram, potentially cutting off important content. This makes 1080x1350 the exact sweet spot for maximum vertical impact.
To create a perfect 1080x1350 image with ImgTools, upload your source image, use the Crop tab with a 4:5 aspect ratio to select the best area, then switch to the Resize tab and enter 1080 width and 1350 height. The crop-first approach ensures you control exactly which part of your image appears in the final post.
For carousel posts, make sure all images in the carousel use the same 1080x1350 dimensions. The first image in a carousel determines the aspect ratio for all subsequent images, so consistency is important.
Save your portrait post as JPEG at 85-90% quality for photographs. Keep file size reasonable for fast uploading. ImgTools handles all processing in your browser with zero server uploads, so your content stays private until you are ready to post.