Input Texts
Text Comparison Tool - Find Differences Instantly
Text comparison (diff) is an essential tool for analyzing file versions, code changes, and document edits. Our free online diff tool helps you quickly spot what's changed between two texts.
Three Comparison Modes
- Line by Line: Compare line-level differences. Best for code versioning and long documents.
- Word by Word: Highlight word-level changes. Ideal for English text edits and report revisions.
- Char by Char: Most granular comparison. Perfect for Chinese text and fine-grained code changes.
Common Use Cases
- Code Review: Compare different versions of source code to find modifications
- Document Editing: Track changes made to articles, reports, or contracts
- Config Management: Compare server configuration files across versions
- Data Verification: Verify that two datasets are identical
Privacy & Security
All comparison operations run entirely in your browser. Your data never leaves your device — safe for sensitive content.
FAQ
How does text comparison work?
This tool uses the LCS (Longest Common Subsequence) algorithm to compute differences. Removed text is shown in red, added text in green, and unchanged text in gray.
Can it handle large files?
It works well with hundreds of lines. For very large files (tens of thousands of lines), browser performance may be limited. Consider splitting large files into smaller sections.
Is my data uploaded to any server?
No. All comparison operations are performed locally in your browser. Your data never leaves your device.
What's the difference between modes?
Line-by-line compares entire rows. Word-by-word breaks lines into words (best for English). Char-by-char compares every character (most precise, good for Chinese text).