Local Image Compressor (Offline / Privacy-Safe)

An open-source, offline image compression tool built with pure HTML, CSS, and JavaScript.
It runs entirely in the browser without uploading files to any server, ensuring privacy and security.

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✨ Features

• 🚀 Fast Compression: Uses WebCodecs (if supported) or Canvas for high performance.
• 📂 Multiple Import Methods: File picker, drag & drop, paste from clipboard, or entire folders.
• 📑 Supported Formats: JPG/JPEG, PNG, WEBP, AVIF (if supported), GIF (first frame), BMP, TIFF.
• 🔢 Limit: Up to 20 images per batch.
• 🖼️ Custom Parameters:
  • Output format
  • Compression quality
  • Resize (keep aspect ratio)
  • Preserve metadata (EXIF, if supported)
  • Transparency handling (remove, black/white background, or custom color)
• 🔒 Offline & Private: Works without internet connection, all processing is local.
• 📊 Real-time Progress: Displays total, queued, running, success, and failed counts.
• 🎨 Dark / Light Themes: Manual switch or follow system preference.
• 🔍 Preview & Compare:
  • Side-by-side comparison
  • Before/After slider
  • Magnifier view for details
• 📈 Compression Report:
  • Summary (total size, savings, average ratio)
  • Per-image details (before/after size, ratio, time, status)
  • Visualization (bar chart, pie chart)
  • Export to CSV / JSON
• 📦 Batch Export: Save all compressed images to a folder (via File System Access API) or download one by one.

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🛠 Usage

1. Download or clone this project.
2. Open index.html directly in your browser (no server needed).
3. Add images via drag & drop, paste, or file picker, then click Start Compression.

⚠️ Recommended: Use Chrome / Edge / Opera (Chromium-based) for best performance.
Safari/Firefox may have limited support (e.g., AVIF, metadata retention, batch export).

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📜 License

MIT License – free to use, modify, and distribute with attribution.