Download view only protected PDF from Google Drive

README.md

Step by step guide to downloading protected PDF from Google Drive

1. Open the document in Google Docs
2. Scroll to the bottom of the document, so all the pages are present
3. Open Developer Tools on separate window and choose the Console tab
4. Paste the code
5. Have fun!

download_pdf.js

let jspdf = document.createElement("script");
 
jspdf.onload = function () {
 
    let pdf = new jsPDF();
    let elements = document.getElementsByTagName("img");
    for (let i in elements) {
        let img = elements[i];
        console.log("add img ", img);
        if (!/^blob:/.test(img.src)) {
            console.log("invalid src");
            continue;
        }
        let can = document.createElement('canvas');
        let con = can.getContext("2d");
        can.width = img.width;
        can.height = img.height;
        con.drawImage(img, 0, 0);
        let imgData = can.toDataURL("image/jpeg", 1.0);
        pdf.addImage(imgData, 'JPEG', 0, 0);
        pdf.addPage();
    }
 
    pdf.save("download.pdf");
};
 
jspdf.src = 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.5.3/jspdf.debug.js';
document.body.appendChild(jspdf); 

Thanks! This helped.
I ran into the same issue — most solutions work for simple cases but break with Google Drive or lazy-loaded PDF viewers because not all pages are rendered at once.
I ended up building a small Chrome extension that handles:

• Google Drive preview (no download button)
• Blob / data images
• Long scrolling pages.

It auto-scrolls and captures everything before exporting to PDF: https://github.com/blackcat1323/SnapPDF

Might save someone else the time 👍