preziscraper

This is a Node.js tool to download and convert a Prezi presentation into a PDF.

Why create this?

One of my lecturers created his lecture in Prezi and I wanted to work with it on my iPad. Unfortunately, Prezi won't let you download their slide sets as PDF unless you have a Pro Account, which is expensive and restrictive.

So I created this Prezi scraper to download the slides and convert them into a single PDF file. (jonguenther's reason)

In my case (Lautiim), I reworked this because too many of my professors use Prezi, and I couldn't pass the PDF to any AI to create a summary or sum like that. De vago noma en criollo.

Requirements

• You need a Chromium-based browser (e.g., Google Chrome) installed on your PC.
• Alternatively, you can switch from puppeteer-core to puppeteer in preziscraper.js.

Installation

Clone this repository and run:

npm install

Using this tool

Currently, the tool is split into two scripts. preziscraper.js contains the scraper, while imgtopdf.js contains the pdf creation tool, to make a pdf out of the scraped Prezi slides.

If I find the time, I will merge them into one script.

Scrape Prezis

To scrape a Prezi and save them as images, simply run

node preziscraper.js --url [PREZI_URL] 

To download a Prezi and save it as a PDF, run:

node preziscraper.js --url [PREZI_URL] --pdf

Additional options:

• --width to set the screenshot width (default: 1440)
• --height to set the screenshot height (default: 1252)
• --out to set the output folder for images (default: img in the repo folder)
• --chromePath to set the path to the Chrome executable [default: C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe for windows and /usr/bin/google-chrome for everything else]
• --pdf to automatically generate the PDF after downloading the images. The PDF will be created as prezi.pdf in the repo folder.
• --del to automatically delete all scraped images after the PDF is created (when used together with --pdf)

Example

node preziscraper.js --url "https://prezi.com/view/your-presentation" --pdf

Transform Prezi Slides to PDF

To transformt the scraped Prezi to PDF, run node imgtopdf.js.

Additional options are:

• --in to set the input folder [default is ./img in the repo folder]
• --out to set the output path [default is ./prezi.pdf in the repo folder]
• --del add this flag to delete all previously scraped images after the convertion is done

How it works

The script uses puppeteer-core to control Chrome, access the Prezi presentation, navigate through each slide, and take screenshots.
It then converts those images into a PDF using imgtopdf.js.

Issues

Transition

The script does not detect when a transition is finished. A fixed timeout of 1200 ms is used between screenshots. If a transition is slow, the screenshot might be taken before the slide is fully loaded.

Full Screen

When running in headless mode, the script may not enter full screen. If you want to see the browser, set headless: false in preziscraper.js.

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Now you can easily download and convert your Prezi presentations to PDF!

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Love from Argentina!

    /\_/\
   ( o.o )
    > ^ <
   🇦🇷🇦🇷🇦🇷🇦🇷