Text Diff Checker
Compare two text snippets side-by-side or inline to highlight additions, deletions, and line changes with zero latency.
What is Text Diff Checker?
Our Text Diff Checker compares two text or code snippets using the Longest Common Subsequence (LCS) / Myers Difference Algorithm, highlighting additions in green and deletions in red. Toggle between side-by-side split view and unified inline view, with optional case and whitespace insensitivity running 100% locally in your browser.
Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.
How to Use the Text Diff Checker
- 1Paste your original text or code into the left editor ("Original Text").
- 2Paste your modified or updated text into the right editor ("Modified Text").
- 3Select your display layout: "Side-by-Side" for visual split view or "Inline" for unified patch view.
- 4Optionally toggle "Ignore Case" or "Ignore Whitespace" to focus exclusively on meaningful text edits.
- 5Review the line modification stats and copy the comparison diff report.
Formula & Calculation Logic
Computes the shortest edit script required to transform sequence A into sequence B. Line tokens are matched hierarchically to distinguish insertions (+), deletions (−), and unmodified blocks.
Diff Computation: Myers O(ND) Algorithm / Longest Common Subsequence (LCS) MatrixText Diff Checker Frequently Asked Questions
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