Instagram Post Size Resizer

Instagram keeps feed photos at full quality when they are 1080 pixels wide and between 1.91:1 (landscape) and 4:5 (portrait); anything outside that range is cropped, and larger files are scaled down. This resizer makes the exact pixel sizes for each format, either by filling the frame and cropping the edges or by fitting the whole photo onto a blurred or coloured background. It also makes a preview of the 3:4 thumbnail the profile grid shows, so you can see what gets cut. The photos never leave your device.

How to use this tool

1. Choose one or more photos.
2. Pick the Instagram format (4:5 portrait is the largest feed size).
3. Choose to crop, or to fit the whole photo on a blurred or solid background.
4. When cropping, choose which part to keep (centre, top, bottom, left or right).
5. Download the 1080-pixel-wide images and check the grid preview.

Formula

crop scale = max(1080 ÷ w, H ÷ h); fit scale = min(1080 ÷ w, H ÷ h); grid thumbnail = centred 3:4 area of the post

w × h is your photo and 1080 × H the format. Cropping covers the frame and cuts the overflow on the side you did not keep; fitting shows the whole photo. The profile grid shows every post as a centred 3:4 rectangle, so a 4:5 post loses a thin strip at each side and a square post an eighth at each side.

Example

A 4032 × 3024 phone photo (4:3) resized to 4:5 portrait with “crop” is scaled by max(1080 ÷ 4032, 1350 ÷ 3024) = 0.4464 to 1800 × 1350 and trimmed to 1080 × 1350, losing 360 px at each side. In the profile grid the visible thumbnail is the centre 1013 × 1350 px.

Instagram image sizes (2026)

Feed: square 1080 × 1080 (1:1), portrait 1080 × 1350 (4:5), landscape 1080 × 566 (1.91:1). Since 2025 the profile grid shows posts as 3:4 rectangles, and 3:4 photos (1080 × 1440) are accepted. Stories and Reels: 1080 × 1920 (9:16). Profile photo: shown as a circle; 320 × 320 is plenty. Instagram stores photos 320 to 1080 px wide at their original resolution and resizes the rest.