SlideSwapper

Convert HTML presentations to PowerPoint (.pptx) by screenshotting each slide.

How it works

1. Opens your HTML file in a headless Chromium browser (via Playwright)
2. Detects slide elements automatically (<section>, .slide, [data-slide]) or uses a custom CSS selector
3. Screenshots each slide at 1920×1080 for crisp output
4. Assembles the screenshots into a widescreen PowerPoint file

Setup

pip install -r requirements.txt
playwright install chromium

Usage

# Basic — auto-detects slides, outputs presentation.pptx
python html_to_pptx.py presentation.html

# Custom output path
python html_to_pptx.py presentation.html -o my_deck.pptx

# Custom slide selector
python html_to_pptx.py presentation.html -s ".my-slide-class"

# Custom viewport size
python html_to_pptx.py presentation.html --width 2560 --height 1440

Supported HTML structures

The tool auto-detects slides using these selectors (in order):

Selector	Frameworks / Conventions
section	reveal.js, generic
.slide	Common convention
[data-slide]	Data attribute convention

If none match, the full page is captured as a single slide.

You can always override with -s "your-selector".