Text Diff
Free online text diff checker. Compare two texts side by side and highlight added, removed and changed lines instantly. Perfect for code and document review.
Diff Results
What is a Text Diff Checker?
A text diff tool compares two versions of pasted text and highlights differences line by line. Added lines appear in green, removed lines in red, and matching lines stay neutral so you can review edits faster.
Use Cases
- Code Review: Compare original and modified code to spot changes during pull request review
- Document Versioning: Track changes in documents across multiple versions (v1, v2, v3)
- Draft Comparison: Compare drafts of essays, articles, or blog posts to see what was edited
- Legal Documents: Review contract changes before signing
- API Responses: Compare API responses or JSON output between different runs
How Does Diff Work?
This tool uses a straightforward line-by-line comparison. It splits both inputs into lines and marks where content matches, where a line was removed, and where a new line was added. When a line changes, the result is shown as one removed line and one added line, which keeps the output easy to scan.
Tips for Comparing Text
- Use auto-compare: Enable the auto-compare toggle to see results update as you type
- Ignore whitespace: Toggle this option if you only care about content changes, not spacing
- Case sensitivity: Uncheck this if case changes shouldn't be highlighted as differences
- Copy results: Use the Copy Diff button to export the comparison to your clipboard
FAQ
How much text can I compare? It works well for typical pasted drafts, code snippets, JSON, Markdown, and document sections. Very large blocks of text can still be compared, but the interface may feel slower.
Can I compare full file contents? Yes, as long as you paste the contents into the two text areas.
What does the similarity percentage mean? It is a quick line-based reference built from exact line matches after applying the selected options. Use it as guidance, not as a full quality score.