KiiMix Instagram Post Size & Free Online Cropper
Crop an Instagram post to 4:5 and export a 1080 × 1350 JPEG. Use this free online tool in your browser without uploading images.
How to use
- 1Select or drop up to 12 images, no larger than 20 MiB each.
- 2Choose a preset or free crop, adjust the crop box, and set the JPEG quality.
- 3Start processing and download each result. Transparent backgrounds become white.
Specifications & output
Crop a portrait image for an Instagram feed post with the 4:5 preset. Move the crop box to keep the part you want, then export a 1080 × 1350 JPEG. For a full-height Story image, use the Story cropper.
| KiiMix default output | 1080 × 1350 px |
|---|---|
| Preset aspect ratio | 4:5 |
| Placement | Portrait feed image |
| Output | JPEG |
| Before publishing | Check the current Instagram upload preview |
| Supported photo aspect ratios | 1.91:1 to 3:4 |
| Width retained at original resolution | 320–1080 px, with a supported aspect ratio |
| Height at 1080 px wide | 566–1440 px |
Platform documentation & further reading:
- Instagram Help — Photo resolution Source checked:
How Instagram handles photo dimensions
Instagram’s photo-resolution guidance for its iPhone and Android apps says photos keep their original resolution when they are 320–1080 px wide and have an aspect ratio between 1.91:1 and 3:4. Unsupported ratios are cropped; images narrower than 320 px are enlarged to 320 px, and those wider than 1080 px are reduced to 1080 px.
This tool’s 1080 × 1350, 4:5 preset falls within that range; it is not the only supported portrait ratio. At 1080 px wide, Instagram lists heights of 566–1440 px. Use the latest Instagram app and check the upload preview.
Choose the framing before the quality
Place the subject inside the crop with room for edges and important text. Review all images in a series together so that a person or product does not jump abruptly between frames. Only then adjust compression and compare the result.
Keep a separate Story crop
The same photograph can work in both places, but a wider portrait crop and a full-height Story reveal different parts of it. Start from the source again instead of repeatedly cropping a previously exported JPEG.
Frequently asked questions
Is 4:5 the tallest portrait ratio Instagram supports?
No. The photo guidance supports up to 3:4, or 1440 px high at 1080 px wide. This page still defaults to 1080 × 1350 at 4:5, which falls within the supported range.
Does this tool publish to Instagram?
No. It exports a JPEG to your device. Upload that file yourself and check the final placement in the app.
Can I choose another aspect ratio?
Yes. You can switch to a square or another preset in the tool. This page starts at 4:5. Check Instagram’s upload preview for the post you are preparing.
Other platform sizes
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