Text Diff Comparator
Compare two text blocks line by line to identify differences.
How it works
Enter your two text blocks in the input areas. The comparison engine will process them line by line, highlighting added lines in green, removed lines in red, and unchanged lines normally, along with line-by-line stats.
Frequently asked questions
How does the line-by-line text comparison work?
We use a Dynamic Programming algorithm called LCS (Longest Common Subsequence). It detects the longest sequence of matching lines to efficiently determine which lines were added, removed, or modified.
Is there a size limit for the text comparison?
To prevent your browser from freezing or lagging on large files, texts with more than 500 lines use a simpler index-based comparison fallback algorithm.
Are my texts sent to any server?
No. All diff processing is performed 100% locally in your browser's memory. Your texts remain completely secure and private.