Resize Image for Instagram Post

Resize photos to Instagram dimensions: 1080x1080 square, 1080x1350 portrait, 1080x566 landscape. Free online, no signup.

Instagram
Open Social Media Resizer

How it works

Instagram supports three post dimensions: 1080x1080 for square posts, 1080x1350 for portrait (4:5 ratio — the most screen real estate in feeds), and 1080x566 for landscape. Our Social Media Resizer has Instagram presets built in — select the format, upload your photo, and get the perfectly sized image. No guessing dimensions, no manual calculations.

Tips

Portrait format (1080x1350) takes up the most space in the Instagram feed and tends to get better engagement. Always export at 1080px width — Instagram compresses images uploaded at lower resolutions more aggressively, reducing quality.

Want to learn more? Read our guide: Social Media Image Sizes Guide

Frequently Asked Questions

What size should Instagram photos be?

Square posts: 1080x1080 pixels. Portrait posts: 1080x1350 pixels (4:5 ratio). Landscape posts: 1080x566 pixels (1.91:1 ratio). Stories and Reels: 1080x1920 pixels (9:16 ratio).

What is the best Instagram post format?

Portrait (1080x1350) gets the most screen space in the feed, which tends to improve engagement. Square (1080x1080) is the classic format and works well for product shots and graphics.

Does Instagram compress my photos?

Yes. Instagram re-compresses all uploads. Uploading at exactly 1080px width minimizes this compression. Photos uploaded at lower resolutions are upscaled and compressed more aggressively, reducing quality.

Can I upload higher resolution than 1080px?

You can, but Instagram will resize to 1080px width. Uploading at exactly 1080px gives you the most control over how the final image looks after Instagram processes it.
Try Social Media Resizer Free

No signup required. Files auto-deleted within 1 hour.

You Might Also Like

Image Resizer

Resize & scale images

Image Compressor

Reduce file size

Format Converter

PNG, JPG, WebP, AVIF

HEIC Converter

iPhone HEIC to JPG/PNG

AI Alt Text Generator

Alt text, descriptions and captions

Related Guides

Resize Image for LinkedIn Banner

Canon Photo EXIF Viewer

Check Photo Print Size

Read WiFi QR Code Online

Verify Photo Date and Time

Convert PNG to JPG Online