ystyleb

Pptx Compressor — Design skill for Claude Code

Design community

Shrink .pptx files by 50-70% without touching slides, layout, animations, or embedded fonts.

How to install Pptx Compressor

This entry records only its repository, not the path inside it, so there is no exact command to give. Open ystyleb/pptx-compressor and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Pptx Compressor does

Shrink .pptx files by 50-70% without touching slides, layout, animations, or embedded fonts. A Claude Code Skill (and plain Python CLI) that re-encodes videos with ffmpeg, optimizes images with Pillow, and safely patches PNG->JPG rels.

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README

pptx-compressor

Shrink a bloated `.pptx` file by 50–70% without touching a single slide, word, layout, animation, or embedded font.

This is a [Claude Code Skill](https://docs.claude.com/en/docs/claude-code/skills), but the underlying script is a plain Python CLI you can use standalone.

What gets compressed — and what doesn't

A `.pptx` is a ZIP archive. The slide markup (XML) is a few hundred KB at most; the bulk is almost always embedded media. This tool only touches media:

Asset	Action
Videos (`.mp4`)	Re-encoded with ffmpeg, H.264, configurable CRF
JPEGs	Re-encoded at configurable quality, optionally downsampled to 1920px
PNGs (with real alpha)	Optimized in place, kept as PNG
PNGs (no alpha) — aggressive mode only	Converted to JPEG; `[Content_Types].xml` and all `.rels` references patched
Slide XML, animations, themes, charts, tables	Not touched
Embedded fonts (`ppt/fonts/*.fntdata`)	Not touched — removing them causes layout drift on machines without the same fonts

Real result from a 262 MB presentation with 2 videos, 168 images and 13 embedded fonts:

Before : 262.0 MB
After  :  81.0 MB   (-69.1%)
Stats  : Stats(jpeg=30, png_keep=35, png_to_jpg=123, videos=2, skipped=15, errors=0)

Installation

As a Claude Code Skill

git clone https://github.com/ystyleb/pptx-compressor ~/.claude/skills/pptx-compressor

Then in Claude Code, any mention of "compress PPT", "PPTX 太大", "shrink this deck" etc. will invoke the skill.

As a plain Python CLI

git clone https://github.com/ystyleb/pptx-compressor
cd pptx-compressor
pip install Pillow
# macOS
brew install ffmpeg
# Debian/Ubuntu
# sudo apt install ffmpeg

python3 scripts/compress_pptx.py path/to/deck.pptx