Diff Checker
Compare two texts side by side. Additions, deletions, and changes highlighted in real time.
Original
Modified
About Diff Checking
A diff (short for "difference") compares two texts and shows what changed between them. Line diff compares line by line — useful for code, config files, and structured text. Word diff compares word by word within the text — better for prose and documentation.
Added text is shown in green, removed text in red. Line numbers are shown for both sides. You can copy the unified diff format (with + and - prefixes) for use in code reviews or patch files.
Uses the diff library (Myers diff algorithm). Processing happens in your browser, nothing is uploaded.