Business
Jobs
  • About Us
  • Solutions
    • Job Postings
      Post your job and receive qualified candidates in 48h.
    • Candidate Assessments
      500+ technical and psychological tests, plus anti-fraud.
    • Headhunting
      Tailor-made executive search from start to finish.
    • Payroll + EOR
      Payroll dispersal and EOR across 15+ LATAM countries.
  • Pricing
  • Jobs

0

357
Views
JsPDF canvas to pdf speed the generate speed

I am using jspdf and canvas to download specific div in my page as pdf but it takes 2 or 3 seconds and my client want it to be fast to download, is there any way to speed up this process, or to decrease the file size because it's 8MB but?

the code

$('#print').click(function (e) { 
e.preventDefault();
let HTML_Width = $(".report").width();
let HTML_Height = $(".report").height();
let top_left_margin = 1;
let PDF_Width = HTML_Width + (top_left_margin * 2);
let PDF_Height = (PDF_Width * 1.5) + (top_left_margin * 2);
let canvas_image_width = HTML_Width;
let canvas_image_height = HTML_Height;
let totalPDFPages = Math.ceil(HTML_Height / PDF_Height) - 1;
html2canvas($(".report")[0]).then(function (canvas) {
    let imgData = canvas.toDataURL("image/png", 1.0);
    let pdf = new jsPDF('p', 'pt', [PDF_Width, PDF_Height]);
    pdf.addImage(imgData, 'JPG', top_left_margin, top_left_margin, canvas_image_width, canvas_image_height);
    for (let i = 1; i <= totalPDFPages; i++) {
        pdf.addPage(PDF_Width, PDF_Height);
        pdf.addImage(imgData, 'JPG', top_left_margin, -(PDF_Height * i) + (top_left_margin * 4), canvas_image_width, canvas_image_height);
    }
    pdf.save("Report.pdf");
    $(".html-content").hide();
});

});

about 4 years ago · Juan Pablo Isaza
1 answers
Answer question

0

There's 2 components that made up the bulk of the performance. The amount of data and the compression.

The amount can be reduced by selecting a lower DPI - 72 for screen-read documents is reasonable, but it might not be great if the intention is print.

For html2cavas we ended up with a scale of 3.125 to get this pixel density down. (It's part of the options parameter). I can't recall specifics, this might result in around 96dpi.

For the compression, you can play around with the options, we ended up using 'FAST' compression on pdf.addImage.

about 4 years ago · Juan Pablo Isaza Report
Answer question
Find remote jobs

Discover the new way to find a job!

Top jobs
Top job categories
Business
Post vacancy Pricing Sales
Legal
Terms and conditions Privacy policy
© 2026 PeakU Inc. All Rights Reserved.
Andres GPT
Show me some job opportunities
There's an error!