slidecompress

A command-line tool that reduces PowerPoint file sizes by intelligently compressing embedded images while maintaining visual quality.

Features

• Automatically resizes large images to reasonable dimensions (1000x1000 max)
• Optimizes PNG files by reducing colors to 255 while maintaining quality
• Compresses JPEG files with balanced quality settings (75% quality)
• Converts TIF/TIFF/EMF files to optimized PNGs
• Preserves original files by creating a new .compressed.pptx file
• Shows detailed compression statistics for each image
• Reports which slides contain the largest remaining images

Requirements

• Python 3.6+
• ImageMagick (magick command must be available in PATH)
• LibreOffice for EMF conversions (libreoffice command must be available in PATH)

Usage

First, compress all images in PowerPoint.

Then, run the tool:

uvx slidecompress presentation.pptx

Or with custom maximum image width:

uvx slidecompress --width 480 presentation.pptx

The compressed file will be saved as presentation.compressed.pptx in the same directory.

To overwrite the original file, use the -f flag:

uvx slidecompress -f presentation.pptx

Example Output

     image1.png:      9.7KB compressed by      1.4KB
     image2.png:      4.5KB
     image3.jpeg:    19.6KB compressed by      2.3KB
     image4.emf:     98.2KB compressed by     25.3KB and converted to .png
Largest media after compression:
      image4.emf:     72.9KB in slide 4
     image3.jpeg:     17.3KB in slide 3
      image1.png:      8.3KB in slide 1
      image2.png:      4.5KB in slide 2

Build

To build and upload to PyPI:

1. Update the version in pyproject.toml
2. Build and upload the package

rm -rf dist/
uvx --from build pyproject-build
uvx twine upload -u __token__ dist/*

License

MIT