Online Text Diff Tool
Compare two texts line by line with char-level highlighting and stats. 100% private, all processing in your browser
Line-by-Line Diff
LCS-based accurate comparison
Privacy First
Your text never leaves your device
Char-Level Highlight
Inline changes within modified lines
Smart Options
Ignore case, whitespace, empty lines
Frequently Asked Questions
How does the diff algorithm work?
The tool uses the LCS (Longest Common Subsequence) algorithm for line-by-line comparison, then highlights character-level changes within modified lines.
Will my text be uploaded to a server?
No. All comparison is done locally in your browser. Your text never leaves your device, fully protecting your privacy.
What do the colors mean?
Green marks added lines, red marks removed lines, amber marks modified lines with inline char-level highlights, and gray marks unchanged lines.
Can I ignore case or whitespace?
Yes. Toggle options to ignore empty lines, ignore case, or trim whitespace before comparing, useful for formatting-insensitive diffs.
Does it support large texts?
It handles fairly large inputs, but the LCS algorithm has O(n*m) complexity. For best performance, avoid comparing extremely long documents.
Is this tool free to use?
Completely free. This is a pure frontend online tool - no registration required, no payment needed, just open and use.
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