What is the best Way to Highlight and Redact PDFs in a Web App?

Been building a web app that has to display PDFs in Angular and add features like dynamic highlights and annotations. At first I thought embedding a simple iframe or using Google Docs viewer was enough. But then I stumbled on Apryse’s WebViewer.

It’s totally overkill for vanilla display, but once I needed programmatic text search and highlight functionality, it was a lifesaver.