Transparent Image Trimmer

Drag and drop one or more transparent images, then export versions cropped to their visible pixels.

Use the hosted app: Transparent Image Trimmer

Features

• Batch image upload by file picker or drag and drop
• Automatic transparent edge trimming by alpha threshold
• Optional padding around the trimmed result
• Per-image PNG download and copy
• One-click PNG download for a single result
• Direct individual PNG downloads for multiple processed images
• Saved threshold, padding, and filename preferences
• Ctrl+Enter download shortcut and per-image removal

Use

Open index.html in a browser, or publish the folder with any static web host.

PowerPoint add-in prototype

This repo also includes a local PowerPoint task pane add-in manifest.

1. Install dependencies.

   npm install

2. Install the local HTTPS certificate used by Office add-ins.

   npm run certs

3. Start the HTTPS dev server.

   npm run dev

4. Sideload manifest.xml into PowerPoint.

The add-in opens a compact task pane UI for PowerPoint. Copy a selected image in PowerPoint, paste it into the pane with Ctrl+V, then insert every trimmed result into the current slide as separate images. File selection is still available for images outside the presentation.