Pdf file size too big created using jspdf

You need to compress the images in the PDF’s that you are generating. Try using Deflate.js and adler32cs.js and use the compress parameter in both jsPDF and addImage functions that you are using. For eg :

var doc = new jsPDF('p', 'pt','a4',true);

make sure you set the last parameter as ‘true’ refer to : https://github.com/MrRio/jsPDF/blob/ddbfc0f0250ca908f8061a72fa057116b7613e78/jspdf.js#L146

Go through it and you can clearly see that the last parameter is for enabling compression.

Also use :

pdf.addImage(png, 'PNG', leftmargin, 120, 485, 270,'','FAST');

instead of

pdf.addImage(png, 'PNG', leftmargin, 120, 485, 270);

you can choose between NONE, FAST, MEDIUM and SLOW, whichever suits you best.