Diff Checker compares two blocks of text or source code and highlights what was added, removed, or changed. Use it for code review, config checks, content edits, and quick before-after validation without installing a separate diff tool.
This tool identifies additions and removals between two inputs and produces a copy-ready diff with summary statistics.
Line mode is best for code and config files. Word mode is useful for documentation edits.
Original: Hello
World. Modified: Hello
OpenAI
World. Output marks + OpenAI as an added line.
Paste both text blocks, choose a compare mode, and run the diff to see added and removed content.
Use Line mode and keep whitespace options disabled if indentation changes matter.
Enable the repeated spaces option before running the comparison.
Run the comparison and read lines prefixed with plus or minus signs.
Use a line-based diff with normalized line endings and copy-ready output for quick code review.
| Compare modes | Line, word, character |
|---|---|
| Stats | Added, removed, similarity |
| Output | Inline copy-ready diff |
| Processing | Client-side JavaScript |