PDF base64


Hi everybody,

I’m facing a problem when Im getting a PDF in base 64, I need to download it locally but I couldn’t get it. I have saved images using this:

this.base64 = 'data:application/octet-stream;base64, '+data.json().RESPUESTA;
window.open(this.base64, ‘_blank’);

It works perfectly, but when I try with a PDF in base 64 it doesn’t work, Im getting the base 64 from the response of my server ==> data.json().RESPUESTA.

I will appreciate any help, pardon my english.


I had the similar issue 3 months ago, it took me 2 weeks to figure out a work around other than using that pdf.js plugin…


Thanks a lot for your answer

My project is gonna be a PWA so it will be deployed in a hosting, so I don’t need to draw in an native app I need to download it, will pdf.js solve that ? I mean it can download it in user’s computer?


I got some progress, i was using Safari browser to test my app and I found out that the browsers can block some URLs, then I tried out in Chrome browser and It worked I download the pdf, not perfectly but for now it did it.

Here is some documentation about : Block - URLs

Try my workaround to open up in a new tab:
 let pdfWindow = window.open();

var pdf = pdfWindow.document.write("<iframe width='100%' height='100%' src='data:application/pdf;base64, " + pdfbase64Data + "'></iframe>");

But the pdf doesn’t open up in the centers on the mobile browsers


Thanks a lot for your answer

I solved after search a lot about it.

I had to implement atob() to decode the base 64 string and it opens a new tab with the browser’s pdf view. here is the code

let file = new Blob([atob(data.json().RESPUESTA)], {type: ‘application/pdf’});
let fileURL = URL.createObjectURL(file);

data.JSON().RESPUESTA is the base 64 string.


Do you have the implementation for atob()? so do I just create a new class and export it then import it as a dependency in the constructor…


I only put it as I showed, I didn’t import I only executed it .

/metodo para descargar pdf/
this.base6 = 'data:application/pdf;base64, '+data.json().RESPUESTA;
let file = new Blob([atob(data.json().RESPUESTA)], {type: ‘application/pdf’});
let fileURL = URL.createObjectURL(file);


I tried this way and It works perfectly, the way with atob() only works with some Data.

Thank you so much for your help


Try this one https://github.com/MarouaneSH/Ionic-jsPdf-Html2Canvas