Photo-Batch-Downscaler

A simple, fast, and user-friendly GUI application for batch resizing high-resolution photos, built in Python. Designed for photographers, creatives, and anyone who needs to prepare images for the web without sacrificing quality.

✨ Features

• 🖱 Drag & Drop support for easy image import
• 📐 Batch resize by maximum width (default: 2048 px)
• 🖨 Custom DPI control (default: 100 DPI)
• 🎚 Adjustable JPEG quality (default: 80%)
• 🗂 Choose custom output folder
• 🧠 Preserves EXIF metadata when available
• ⚡ High-quality LANCZOS resampling
• 📊 Progress bar and status updates
• 🧵 Background processing (UI stays responsive)

Supported formats

• JPG / JPEG
• PNG
• TIFF
• BMP
• WEBP

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🖼 Use case

This tool is ideal if you:

• Want to upload photos to websites, portfolios, or social media
• Need consistent export settings across many images
• Prefer a lightweight desktop tool over heavy photo editors
• Want Lightroom-like export defaults without opening Lightroom

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🛠 Requirements

• Python 3.9+
• Operating Systems:
  • macOS
  • Windows
  • Linux (with Tk support)

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📦 Installation

Clone the repository:

git clone https://github.com/yourusername/photo-batch-downscaler.git
cd photo-batch-downscaler

Install dependencies:

pip install pillow tkinterdnd2

▶️ Usage

Run the application:

python photo_downscaler.py

Workflow

1. Drag & drop images into the window or click Add Images
2. Adjust export settings (width, DPI, quality)
3. Choose an output folder
4. Click Process Images
5. Done ✅

Processed images are saved using the original filenames.

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⚙ Default Export Settings

Setting	Default
Max width	2048 px
Resolution	100 DPI
Quality	80%
Resampling	LANCZOS

These defaults are chosen to match common Lightroom web export presets.

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🧠 Technical Notes

• EXIF data is preserved when possible
• Images smaller than the max width are not upscaled
• Processing runs in a background thread to keep the UI responsive
• Uses Pillow for image handling and tkinterdnd2 for drag & drop

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🚀 Possible Extensions

Ideas if you want to extend the tool:

• Rename files on export
• Convert all images to JPEG / WebP
• Height-based resizing
• Preset profiles (Instagram, Web, Portfolio)
• CLI version for automation

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📄 License

MIT License – feel free to use, modify, and share.

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🙌 Contributions

Pull requests and suggestions are very welcome.
If you use this tool in your workflow, a ⭐ on GitHub is always appreciated.