Text Diff Checker
Compare two texts side by side and highlight differences
Processed on your device — never uploaded
Original Text
Modified Text
Frequently Asked Questions
What is a text diff checker?
A diff checker compares two pieces of text and highlights the exact lines and words that differ between them, making it easy to spot changes.
How does the diff algorithm work?
It uses a longest common subsequence (LCS) algorithm to find the minimal set of additions, deletions, and modifications between two texts.
Can I compare code with this tool?
Yes. This diff checker works with any text including source code, configuration files, and documents. It preserves whitespace and indentation for accurate code comparison.
Is my text data safe?
Yes. All comparison happens locally in your browser. Your text is never uploaded to any server.