Is my photo uploaded to a server?

No. Cropping and resizing happen in your browser using the HTML5 Canvas API. Your photo is never sent anywhere.

What is the difference between this and an aspect ratio calculator?

A ratio calculator only tells you the target dimensions. This tool actually crops and resizes the image file you upload and gives you a downloadable result at that exact size.

What image sizes does Instagram use for posts?

Square posts are 1080 x 1080 px (1:1), portrait posts are 1080 x 1350 px (4:5), and landscape posts are 1080 x 566 px (1.91:1). This tool supports all three.

Should I download as JPG or PNG?

JPG gives a smaller file and works well for regular photos. PNG keeps text, logos, and hard edges sharper but produces a larger file. Instagram accepts both.

My photo is not tall or wide enough for the crop I picked. What happens?

The crop box automatically shrinks to fit inside your photo while keeping the selected ratio, so you always get a valid post size even from a source image with different proportions.

Why is portrait (4:5) recommended over square?

A 4:5 portrait post takes up more vertical space in the feed than a 1:1 square post, which tends to get more attention while scrolling. Both are valid, standard Instagram formats.

Instagram Post Resizer

Upload a photo, crop it to a square, portrait, or landscape Instagram post, and download it at the exact pixel size.

Post Format

1080 x 1080 px — the standard square Instagram post.

Upload Photo

Click to choose a photo
JPEG, PNG, or WebP

Output Settings

Output pixels

1080 x 1080 px

Format

Keep the main subject and any text away from the crop edges so it still reads clearly at the small size Instagram shows in the feed and grid.

Upload a photo to start cropping

Summary

This tool crops and resizes a photo to Instagram's exact post dimensions. Choose a square (1080 x 1080 px), portrait (1080 x 1350 px), or landscape (1080 x 566 px) format, upload an image, drag the crop box to frame the part you want, then download the result as a JPG or PNG. Cropping and resizing happen in your browser with the Canvas API, so the photo is never uploaded anywhere.

How it works

Pick a post format: square, portrait, or landscape.
Click the upload zone or drag a photo onto it.
A crop box locked to the chosen ratio appears over your photo.
Drag the box to reposition it, or drag a corner to resize while keeping the ratio.
Choose JPG or PNG as the output format.
Click "Download Image" to save the resized post at the exact target pixel size.

Use cases

Resize a landscape photo down to a square post before uploading to Instagram.
Crop a portrait photo to the 4:5 ratio that gets the most vertical space in the feed.
Prepare a wide photo for the 1.91:1 landscape post format without Instagram cropping it automatically.
Convert a screenshot to PNG for a post with sharp text or a logo.
Reframe an existing photo after switching between square and portrait format.
Batch-prepare consistent post sizes for a content calendar, one image at a time.

Frequently Asked Questions

Last updated: 2026-09-09 · Reviewed by Nham Vu