onlinetextcompare.com
OnlineTextCompare is a free, browser-based two-way text diff and merge tool. It requires no signup or installation, and all comparisons run locally in the user's web browser for privacy and security. The tool highlights differences between two text inputs using red and green arrows, supporting use cases such as reviewing edits and merging content changes. It also offers additional comparison tools for formats including HTML, CSS, JavaScript, JSON, XML, SQL, Excel, PDF, and lists.