Enter your input
Two plain-text inputs. Use Try example where available to see the expected shape.
Text Diff Checker
Compare original and revised text line by line.
Last reviewed: · Testing methodology
How to use
Compare original and revised text line by line.
Choose options and run
Select the relevant mode or settings. Automatic tools update as you type; other tools use the labeled primary action.
Review the result
Check the result against your input, then use the available copy or download action. Edits clear or recompute the result.
Examples and checks
How this tool works
Bounded line-level longest-common-subsequence comparison. Processing stays in your browser.
- Input
- Original: A / B; revised: A / C
- Output
- One unchanged line, one removed line and one added line
Limits and questions
Inputs are processed in your browser. Analytics and advertising can make separate network requests.
Limits, edge cases, and troubleshooting
At most 200,000 total characters and 1,000,000 line pairs. This is a line diff, not a semantic comparison.
When to use another workflow
Use your target editor or runtime when exact platform behavior or a broader capability is required.
Verification
Review record: 2026-08-26. See the documented behavior and limitations above, and the testing standards for the scope of review.
Testing methodologyFrequently asked questions
- What does this tool support?
- Two plain-text inputs. At most 200,000 total characters and 1,000,000 line pairs. This is a line diff, not a semantic comparison.
- Where is my input processed?
- Tool calculations and conversions run locally in your browser. Existing analytics and advertising requests are separate from input processing.