Resize image for Instagram
One tap for the exact pixels Instagram serves — square post, portrait, landscape, or Story — resized on your own device.
Drop your image here
or
JPG, PNG, WebP, HEIC, SVG — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
Instagram re-renders every image you upload to fixed display sizes, and anything that doesn't match gets scaled and cropped by their pipeline — which is where sharpness quietly dies. Feeding it the exact target size keeps that decision in your hands: 1080×1080 for square posts, 1080×1350 for portrait (the format that gets the most screen), 1080×566 for landscape, and 1080×1920 for Stories and Reels covers. The presets above the size fields set each with one tap.
A preset asks for an exact box, so if your photo's proportions don't match, the tool warns that it would stretch rather than silently distorting anyone's face — crop to the target ratio first (every phone gallery does 1:1, 4:5, and 9:16 crops) and then resize here for a distortion-free fit. Everything runs in your browser, the file keeps its name, and JPG output at these sizes uploads fast even on mobile data.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Choose quality or size
Pick a quality preset, set an exact KB target, or switch the output format — tuned for resize image for instagram.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Why 1080 pixels and not something bigger?
Instagram serves feed images at 1080 pixels wide — upload larger and their servers downscale it for you, usually less carefully than you would. Uploading the exact display size gives their pipeline nothing to crush, which is why pre-sized images tend to look sharper in the feed.
My photo got a warning about stretching — what should I do?
Your photo's proportions don't match the preset's box. Crop it to the target ratio first — 1:1 for posts, 4:5 for portrait, 9:16 for Stories; every phone gallery offers these crops — then resize here. That way the fit is exact and nothing distorts.
Which format should I upload to Instagram?
JPG — it is what Instagram transcodes everything into anyway, and a pre-sized JPG uploads fastest. Switch the output format chip to JPG in the same pass if your source is PNG or HEIC.
Does resizing here beat letting Instagram scale my photo?
Usually, yes. You control the resampling quality and see the result before posting, instead of letting a server decide. It will not make a blurry photo sharp — but it stops a sharp photo from turning soft in the feed.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.