Resize any photo to Instagram's 1080×1080 square post size, or switch to portrait, story or profile size in one click. It works in your phone's browser with no app, and the photo is never uploaded.
How to use Instagram Post Resizer
Drop a photo here or choose a file.
It's cropped to fill 1080×1080, centred. Pick Post, portrait 4:5, Story / Reel or Profile photo from the Size for list, or Post, portrait 3:4 for a 1080×1440 tall portrait.
Choose the format; JPEG suits photos.
Download the image and post it.
Frequently asked questions
What is the best size for an Instagram post?
1080 px wide. Instagram Help says photos keep their resolution up to 1080 px wide when the aspect ratio is between 1.91:1 and 3:4. So 1080×1080 for square, 1080×1350 for 4:5 portrait or 1080×1440 for 3:4, the tallest. Stories and Reels are 1080×1920.
Will Instagram crop my photo?
In the feed, not if it's between 1.91:1 and 3:4; otherwise Instagram crops it to fit. On your profile grid, posts are now shown as tall rectangles, so square and landscape posts are trimmed at the sides there. Keep the main subject centred.
What about wider photos?
The widest Instagram keeps is 1.91:1, about 1080×566. Pick Post, landscape 1.91:1 from the Size for list to keep a landscape shot.
Do all carousel photos need the same size?
Yes, a carousel uses one shape for every slide. Resize each photo to the same preset before posting.
Can I use it on my phone?
Yes. It works in mobile browsers: choose a photo from your gallery and download the result.
Is my photo uploaded?
No. Everything happens in your browser.
Instagram sizes
Format
Ratio
Pixels
In the Size for list
Square post
1:1
1080×1080
Yes
Portrait post
4:5
1080×1350
Yes
Tall portrait post
3:4
1080×1440
Pick it from the Size for list
Landscape post
1.91:1
1080×566
Pick it from the Size for list
Story or Reel
9:16
1080×1920
Yes
Profile photo
1:1
320×320
Yes
Tips
Stories and Reels have buttons and captions over the top and bottom; keep text in the middle.
Instagram re-compresses uploads. A 1080 px wide JPEG at high quality gives it the best starting point.
To choose exactly what's kept instead of a centre crop, frame it first with the image cropper at 1:1 or 3:4. For other platforms, use the image resizer.