Instagram displays posts at 1080 px wide in a 1:1 square or 4:5 portrait ratio, and stories at 9:16. Choose “Fit inside” to post the whole photo without Instagram cropping it.
How to use the instagram photo resizer
- Choose your image(s).
- Pick the size and how the image should fit: crop to fill, or fit inside with a background colour.
- Download the resized image, ready to upload.
Post without cropping
Instagram crops photos taller than 4:5 or wider than 1.91:1. With “Fit inside”, the full photo is placed on a white (or any colour) background at 1080 × 1350, so nothing is cut off and it fills the most space in the feed.
Frequently asked questions
What is the best Instagram post size?
1080 × 1350 px (4:5) because it takes up the most screen space in the feed.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested