Text Diff
Highlight changes between texts
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About this tool
Text Diff compares two blocks of text you paste in and highlights what changed line by line, using the longest common subsequence (LCS) algorithm โ removed lines get a red strikethrough, added lines get a green background. Useful for spotting what changed between two versions of a contract, code file, or draft. Comparison happens entirely in your browser, and neither text is sent to a server.
How to use
- Paste the original text on the left and the modified version on the right.
- The line-by-line comparison appears below as soon as you type.
- Red lines (โ) existed only in the original; green lines (+) exist only in the modified version.
- The number of changed lines is summarized at the top for a quick sense of scale.
Frequently asked questions
- Does it compare line by line or character by character?
- Line by line. If even one word changes within a line, the whole line shows up as a removed (โ) and added (+) pair. It does not point out exactly which characters within a line changed.
- What happens if a line just moves to a different position?
- Because it uses the longest common subsequence (LCS) method, a line that moved shows up as removed from its old spot and added at its new spot. When several lines are identical, which pair gets matched depends on the algorithm.
- Does a single extra space count as a change?
- Yes. A trailing space or a one-character indentation difference is treated as a different line and shown as a change.
- Is the text I paste in sent to a server?
- No. Comparison happens entirely in your browser and neither text is sent anywhere.