The short version
Follow the steps below with the free Resize Image for Instagram tool — it runs entirely in your browser, needs no upload, account or watermark, and finishes in about a minute.
Step by step
1
Start from a square crop
Centre-crop to 1:1 around the subject (Instagram shows squares in the grid whether you upload one or not).
2
Set 1080×1080
Type 1080 for width and height in the resizer with the lock on.
3
Keep the export JPEG at high quality
Instagram re-compresses anyway — a 90–95% JPEG at exactly 1080 px wide survives best.
4
Bulk if posting a carousel
Load up to 30 photos, one click gives you the whole set.
Open the Resize Image for Instagram toolFree · unlimited · runs in your browser
Pro tips & common mistakes
- Do not "fit to square" by stretching — faces distort instantly.
- For portrait posts, 1080×1350 (4:5) gets more screen time than a square.
- Upload at exactly 1080 px wide; bigger files get downscaled twice and go soft.
The exact requirement
Need the precise numbers? This task pairs with our full spec sheet: Instagram Post Size.
Related guides
How to Crop a Photo to a Perfect Square (1:1)How-to guideHow to Make a Story / Reel Picture (1080×1920)How-to guideHow to Make a Square Profile Picture (PFP) for Any AppHow-to guide
Frequently asked questions
Is 1080×1080 still the right Instagram size?
Yes for squares; the algorithm favours 4:5 (1080×1350) for feed reach, and Stories/Reels are 1080×1920.
Why does my square photo look blurry after upload?
You uploaded a huge file and Instagram downscaled it badly. Export at 1080 px yourself — you control the sharpening instead.
Can I resize 30 photos at once?
Yes — the resizer handles up to 30 files per batch and zips the results.