Text Diff.
Compare two text blocks side by side and highlight added and removed lines. Uses LCS algorithm for accurate results. Free online tool.
Ad slot: horizontal
How to use
Paste your original text in the left box and the modified version in the right box.
Click Compare to see the differences highlighted.
Green lines were added, red lines were removed, grey lines are unchanged.
Frequently Asked Questions
What algorithm does this use?
It uses the Longest Common Subsequence (LCS) algorithm which correctly handles repeated lines, unlike simpler set-based approaches.
Is this diff line-by-line or character-by-character?
Line-by-line. Each line is treated as a unit. Character-level changes within a line are not highlighted separately.
Is my text sent to a server?
No. The diff is computed entirely in your browser.
Ad slot: horizontal