Paste two texts to see exactly what changed, line by line. Added lines are green, removed are red.
The tool uses a line-by-line LCS (longest common subsequence) algorithm up to 800 lines per side, with a fast hash-based fallback for very large inputs.
No. The comparison runs locally in your browser — neither input is transmitted to any server.
Yes — paste any text-based content (JavaScript, Python, JSON, YAML, plain prose, configs). Whitespace and case are preserved exactly.