I am looking for an open source pdf editor like the Sejda or Dropbox which will allow me to upload my document and also provide the editing feature in the web-app itself.
Even if someone is able to answer what does Dropbox uses to provide PDF editor, it would be of great help.
I tried various open source editors but couldn't run them onto my local system. So I am looking for an open source software which provides me a editor online itself.