Platform guides for the file you are about to upload: every platform resizes, crops or re-compresses what it receives, or rejects it outright. Pick where your file is going, open it here, and the bench prepares it to that platform's published limits in your browser. It shows exactly what changed. Limits change without notice, so each one links to the platform's own page.
Instagram keeps a feed photo at up to 1080 px wide if its shape is between 1.91:1 and 3:4. Anything wider or taller gets cropped, and anything larger gets scaled down by Instagram’s own encoder. Since 2025 the profile grid shows every post as a 3:4 tile, so keep faces and text inside that frame.