Semantic Text Compare
Compare by Image Overlay
JS Compare 2 PDF Files by Image Overlay Demo
The simplest way to programmatically compare 2 files either by converting the two documents to images and lay them on top of each other for a pixel-by-pixel comparison.
This document is displayed as red
This document is displayed as blue
Red and blue colors show where there is no overlap in the document. When lines overlaps they are displayed as black.