Compare two text versions side-by-side to highlight added lines, removed lines, and structural differences.
Compare two blocks of text side-by-side to highlight additions, deletions, and line changes
A fast client-side text comparison and diff visualization tool. Paste two passages of code, documents, or string data to inspect additions, deletions, and line-by-line differences instantly.
Paste the original version into the 'Original Text (Text A)' panel on the left.
Paste the updated or modified version into the 'Modified Text (Text B)' panel on the right.
Inspect the color-coded Diff Output below (+ for additions in green, - for removals in red).
Toggle settings like Case Sensitivity or Ignore Whitespace, then copy the unified diff result.
Color-coded diff visualization (Emerald green for additions, Rose red for deletions)
Real-time addition, deletion, and line change counters
Case sensitivity and whitespace-ignoring filters
One-click text swapping and unified diff copying
Browser-based privacy — comparison scripts run locally in your browser
Text Compare (Diff Viewer) works on the text you enter and applies the selected transformation or comparison rules. Results depend on the input text and, for language-sensitive operations, the wording and formatting of that text.
Results are provided for convenience. Check the output against your own requirements before using it in an important workflow, publication or decision.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
Answers about how the tool works, its limitations, and how your information is handled.
The tool utilizes the Longest Common Subsequence (LCS) diff algorithm to evaluate line-by-line structural changes between Text A and Text B.
When 'Ignore Spaces' is enabled, trailing and leading whitespace changes across lines are ignored, allowing you to focus strictly on substantive text modifications.
No. All diff processing executes strictly inside your browser environment.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
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