CompareDiff

CompareDiff is a free, privacy-focused workspace for reviewing changes across text, source code, structured JSON, images and PDF documents. Text comparisons include line, word and character views, while image tools offer overlays and before-and-after sliders for visual review. Comparison work runs locally in the browser, so source files and drafts are not uploaded to a remote server. It works without a paid subscription and is useful for developers, editors, designers and QA teams.