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INSTACUT 🧩

Instagram 3-Post Grid Splitter

INSTACUT is an infinite caroussel lightweight browser tool that splits a single image into three aligned Instagram posts (1080×1350, 4:5) while preserving grid continuity.

It compensates for Instagram’s default square preview behavior to avoid visible misalignment in profile grids.

Live version: https://secret-guest.github.io/instacut/

📸 Why This Exists

Instagram posts are uploaded in 4:5 (1080×1350).

However, the profile grid preview crops them closer to 3:4 portrait, which can break alignment across multi-post layouts.

If you split an image naively into three equal 1080px columns, the grid will not look seamless.

INSTACUT corrects this.

⚙️ How It Works

1. The image is loaded into a canvas.

2. A continuous master canvas is created based on the visible grid ratio (~3:4).

3. A safe “bleed” area is calculated to compensate for grid cropping.

4. Three 1080×1350 tiles are generated:

   • The visible area is centered.
   • Side pixels are extended using real image data (no 1px stretching).

5. Files are exported as PNG.

6. Optional ZIP download is generated using JSZip.

Everything runs fully client-side. No uploads. No server. No storage.

📐 Instagram Sizes Reference

Context	Size (px)	Ratio
Post (Portrait)	1080×1350	4:5
Profile Grid Preview	~3:4 crop	~0.75

Important: Instagram defaults to square preview during posting. Tap ⤢ Expand before publishing.

🚀 Usage

1. Drag & drop an image.
2. Preview appears automatically.
3. Download individual tiles or the ZIP file.
4. Post each image as 4:5 (1080×1350).
5. Expand before publishing.

📜 License

MIT License.

❓ Support

If you encounter issues or have feature suggestions:

• Open an issue
• Start a discussion

💎 Recommendations

In your quest for more tools to enhance your desktop productivity, these additional repositories are worth a look:

• Barcraft : Create barcodes/QRCodes using an application free from malware, sourced directly from GitHub.

Looking for more? Discover user-friendly, GUI-free script here:

• Tiny Scripts

If you're a 3D animator, consider:

• Animation

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