Text Diff & Comparison Checker
Compare two blocks of text side-by-side with line-by-line and character-level difference highlighting.
Compare Text Blocks
Visual Differences
About the Text Diff & Comparison Checker
Finding subtle variations between two drafts of an article, legal clause, code snippet, or translation can be tedious and prone to human error. Our Text Diff Checker inspects both strings, identifying exact additions, removals, and unchanged phrases.
Choose between side-by-side split view or unified inline view with green highlight for added text and red strikethrough for deleted text.
How the Calculations Work
Uses a Longest Common Subsequence (LCS) dynamic programming algorithm to detect minimal edits between string sequences.
LCS(i, j) = LCS(i-1, j-1) + 1 if char matches
Variables & Definitions
- Original: Baseline source text
- Modified: Updated revised text
- Diff: Marked additions and deletions
Original "Calculators are great" vs Modified "Calculators are super great" flags "super" as an addition.
Key Terms Explained
LCS Algorithm
Longest Common Subsequence: finding the longest subsequence common to all sequences in a set.
Inline vs Split View
Inline combines edits into a single paragraph; Split view maintains separate original and revised columns.
Practical Tips & Pitfalls to Avoid
Trim accidental leading/trailing spaces
Whitespace differences can trigger diff highlights even when words appear identical.
Frequently Asked Questions
Yes, you can paste HTML, CSS, JavaScript, JSON, or SQL into both boxes.