Paste your original text in the left panel and the modified text in the right panel. The tool computes a line-by-line diff and highlights additions, deletions, and unchanged lines with distinct colors — green for additions, red for deletions, and neutral for unchanged content.
Diff tools are essential for code review (comparing code versions), content editing (tracking document changes), configuration management (comparing config files), and debugging (identifying what changed between working and broken states).
Yes. All comparison is done client-side in your browser. Neither the original nor modified text is ever uploaded to any server. This is important when comparing sensitive files like configs or proprietary code.