WARNING

THIS TOOL IS NOT MEANT TO CIRCUMVENT COPYRIGHT PROTECTION. IT SHOULD ONLY BE USED TO DOWNLOAD ETEXTBOOKS THAT YOU OWN. REPRODUCING AND/OR DISTRIBUTING COPYRIGHTED WORK IS A CRIME IN MANY COUNTRIES AND JURISDICTIONS.

CHEGG HAS UPDATED THEIR 14 DAY RETURN POLICY SO THAT THEY DO NOT HAVE TO GIVE YOU A REFUND IF YOU REACH THE MAXIMUM NUMBER OF PRINTED PAGES. PLEASE DO NOT ABUSE THEIR GENEROUS RETURN POLICY.

CheggDownloader

This is a simple Python script that allows you to download an eTextbook from Chegg.com. Output (on the limited sample size that I have) will be stored as a separate PNG file for each page.

Requirements

Python 3
Google Chrome
browser_cookie3
requests
The eTextbook you are downloading must allow itself to be printed (limited pages OK)

Usage

Make sure that you have purchased the eTextbook from Chegg (they have a generous 14-day return policy).
Using Chrome, go to the eReader website (https://ereader.chegg.com) and log in.
Open the book you want to download. Record the e-ISBN number as shown in the URL. It should be the 13-digit number after /books/.
Click on the "Print" icon and record the maximum number of pages you are allowed to download at once (the larger the number, the faster the book can be downloaded).
Find the starting and ending page that you would like to download.
Start downloading

$ pip install -r requirements.txt
$ python3 CheggDownloader.py <paste e-ISBN here> <starting page> <ending page> -i <maximum pages you can download at once>
$ # Example
$ python3 CheggDownloader.py 1234567890123 1 999 -i 5
$ # Download to a specified folder (will be created is doesn't exist)
$ python3 CheggDownloader.py 1234567890123 1 999 -i 5 --out-dir=book/

Downloading unnumbered pages

If some pages in the book are unnumbered, or are not numbered with Arabic numerals (e.g. numbered with Roman numerals), you may use

$ python3 CheggDownloader.py <e-ISBN> -p <pages separated by space>
$ # Example
$ python3 CheggDownloader.py 1234567890123 -p i ii iii iv v

Options

See the help message: python3 CheggDownloader.py -h

usage: CheggDownloader.py [-h] [-i INTERVAL] [-p [PAGES [PAGES ...]]]
                          [--max-retries MAX_RETRIES]
                          [--retry-delay RETRY_DELAY] [--book-name BOOK_NAME]
                          [--out-dir OUT_DIR]
                          isbn [start] [end]

positional arguments:
  isbn                  the e-ISBN of the book to download

optional arguments:
  -h, --help            show this help message and exit
  --book-name BOOK_NAME
                        name of the book to download. Default=[Book]
  --out-dir OUT_DIR     specify a directory to save all images.
                        Default=[Current Directory]

pages:
  start                 starting page to download
  end                   ending page to download
  -i INTERVAL, --interval INTERVAL
                        maximum pages to query and download at once
  -p [PAGES [PAGES ...]], --pages [PAGES [PAGES ...]]
                        a list of pages to download, separated by space

error handling:
  --max-retries MAX_RETRIES
                        maximum number to retry downloading a page if it
                        fails. Default=[3]
  --retry-delay RETRY_DELAY
                        delay in milliseconds between retries. Default=[500]

movefaster / CheggDownloader