≠Text Diff

Text comparison (diff) identifies the differences between two texts. It's a fundamental task across software development — code reviews, document version control, and configuration change tracking all rely on it. Similar to Git's diff command, it visually distinguishes added lines (green), deleted lines (red), and unchanged lines. This tool supports line, word, and character-level comparison with both side-by-side and unified view layouts.

How to Use

1
Enter Original Text
Paste the original (baseline) text in the left panel.
2
Enter Compare Text
Paste the modified (changed) text in the right panel.
3
Configure Options
Set comparison unit (line/word/character), view mode (side-by-side/unified), and toggle options like ignore case, ignore whitespace, etc.
4
Review Results
Additions (green) and deletions (red) are highlighted with colors. Similarity percentage and statistics (added/removed/unchanged counts) are also shown.

Tips

💡Enable 'Auto Compare' to see results update instantly as you type or paste text.
💡Use the 'Swap' button to quickly switch original and compare texts.
💡The 'Changes only' option is useful for large files — it hides unchanged lines to focus on what changed.
💡Great for code reviews: compare pre- and post-deployment code to catch unintended changes.

FAQ

Q. What algorithm does text diff use?: A. Most diff tools are based on the LCS (Longest Common Subsequence) algorithm, which finds the minimum number of insertions and deletions needed to transform one text into another.
Q. Can I ignore whitespace or blank line differences?: A. Yes. Enable the "Ignore whitespace" option to skip indentation and blank-line changes, showing only meaningful content changes. This is useful when comparing reformatted code.
Q. Can I compare large files?: A. Yes. All processing is local in your browser, so there is no size limit imposed by network transfer. Very large files may be slower depending on your device's performance.