About Text Diff Checker
Finding the exact differences between two similar blocks of text or code can be incredibly frustrating. Our free online Diff Checker highlights additions, deletions, and modifications between two texts instantly.
How It Works
The tool uses a specialized diffing algorithm (similar to what Git uses) to compare the 'Original' and 'Modified' text inputs line by line and word by word. It then renders a visual comparison, highlighting removed text in red and added text in green.
Common Use Cases
- Comparing two versions of a contract or legal document
- Finding syntax errors or changes in source code
- Reviewing edits made to an article or essay
- Checking configuration files for accidental modifications
Frequently Asked Questions
No. The diffing algorithm runs entirely locally in your web browser using JavaScript. Your text never leaves your device.
Yes, the tool can handle large blocks of text, though extremely massive files (tens of thousands of lines) might cause your browser to slow down temporarily.
The tool detects additions, deletions, and modifications at the line and character level. Added lines are shown in green, removed lines in red.
Yes, paste code in any language. The diff viewer preserves formatting and syntax, making it easy to spot code changes between versions.
Unified diff shows changes inline with + and - markers. Side-by-side diff shows the original and modified text in two columns for easier visual comparison.
The tool can be configured to detect all changes including whitespace. This is useful when comparing code where formatting changes are mixed with real changes.