Instagram’s New 4:5 Aspect Ratio: Complete Fix Guide 2025

If you've opened Instagram on your phone recently you may have noticed something's not quite right. The aspect ratio of the images has changed.

On desktop they’re still square – for now!

But on mobile devices, the default display format is now 4:5

Instagram has quietly shifted mobile preview ratios from the classic square (1:1) to portrait mode (4:5)

You used to have this:

But now you have this:

Which is not the effect you were going for

What Changed in Instagram’s Mobile Display?

In January 2025, Instagram rolled out a significant update to how images appear in mobile profile grids.

Instead of the traditional square format we've all built our feeds around, photos and Reels covers are now displayed in a 4:5 ratio on mobile devices – meaning they're taller than they are wide.

The ratio of Instagram posts was previously 1:1 – it is now 4:5 The resolution was 1080x1080 – it is now 1080x1350

Note that the desktop version still shows square previews, creating a disconnect between how your profile appears on different devices.

So how do you fix this problem?

But if you don’t like how this looks, you have a few options:

How to Fix Existing Posts

To fix this issue on posts without deleting and reuploading them. Instagram offers a basic fix – you can change the look of the preview.

Here’s how you do that:

1. Tap on the post you want to change

   

2. Tap the three dots above and select "Adjust preview."

   

3. Choose Fit or Fill.

   

4. And voila!

   

There are problems with this approach though:

→ There’s no blurred background option with Fit

→ You have no control over exactly how your image is cropped in Fill

→ You'll need to adjust each post individually, one at a time

If you’re not happy with this, you can always upload a new one – after resizing it perfectly to 4:5 ratio, so it just works naturally

Solutions for New Uploads

Desktop Solution

If you’re on a computer, use the free Instagram resizer tool at Simple Image Resizer

1. Go to Simple Image Resizer’s custom web app It’s right here → free Instagram resizer tool

2. Upload your image

   Drag and drop or upload your image to the page.

   

   And then wait while it uploads

   

   Pro tip: Lots of photos to upload?
   
   You can go premium to get batch mode – so you can upload multiple images at the same time
   
   Perfect for people with lots of images

3. Select Post (portrait) 4:5

   

4. Choose Fill, Fit or Stretch

   Fit (blur)

   

   Your is placed in a 4:5 frame with a blurred (or coloured) background

   Fill

   

   Your image is cropped to 4:5 while maintaining its original proportions, so it fills the frame

   Stretch

   

   Your image will be gently stretched to fit the 4:5 ratio

5. Click on ‘Resize Image to Post (portrait)’

   

6. Download your 4:5 image

   

7. Upload to Instagram as usual

Here’s that link again → free Instagram resizer tool

iOS Solution

Photo & Picture Resizer app is brand new on iOS as of late 2024.And it’s exactly the right tool for the job.

It’s perfect for resizing your photos to the new 4:5 format

1. Install Photo & Picture Resizer on your phone or tablet

   

2. Choose ‘Select photos’

   

3. Choose the photo then choose ‘Add’

   

4. Tap ‘Resize’

   

5. Choose Social Media -> Instagram – Post (portrait)’

   

6. Tap ‘Resize to 1080x1350’

   

7. Choose Crop, Stretch or Fit

   

   Crop – You crop your image exactly how you like with frame set at 4:5 ratio

   Fit – Your photo is placed in a 4:5 frame with a blurred (or coloured) background

   Stretch – Your image is stretched to fit the 4:5 ratio

8. Share to Instagram as usual

   Or save as a new image and upload at your convenience

   

Android Solution

Photo & Picture Resizer app is a longstanding favourite on Android.

Here’s how to use it to resize your photos to the new 4:5 format.

1. Install Photo & Picture Resizer on your phone or tablet

   

2. Tap on ‘Select Photos’

   

3. Select your photo and choose ‘Open’

   

4. Tap ‘Resize’

   

5. Choose Social Media -> Instagram – Post (portrait)

   

6. Choose Fill, Fit or Stretch

   

   Crop – You crop your image exactly how you like with frame set at 4:5 ratio

   Fit – Your photo is placed in a 4:5 frame with a blurred (or coloured) background

   Stretch – Your image is stretched to fit the 4:5 ratio

7. Share to Instagram as usual

   Or save as a new image and upload at your convenience