PDF Editify makes browser-based markups and utility tasks easy, but it remains limited as a full document editor.

You don’t need expensive software for basic PDF tasks. In fact, all you need is a handful of free web-based apps.

OpenPDF is an open-source Java library for creating, editing, rendering, and encrypting PDF documents, as well as generating PDFs from HTML. It is licensed under the LGPL and MPL open source licenses.