I have a input field where a user uploads his/her pdf file which is then uploaded to firebase storage in vanilla javascript(Modular). Now i want to add a watermark to this pdf before uploading to firebase. I wanted to know how this could be done.
Extending this idea I also might need this for a image(jpeg/png) files.
Note: I have seen other similar stackoverflow answers but it is giving the watermark while rendering on the webpage and not while uploading.
Any Help is Appreciated!