Text Diff & Line-by-Line Comparator

Compare two text passages or documents side-by-side with color-coded additions, deletions, and similarity percentage.

About this tool

Spot changes, revisions, and copied passages quickly with instant client-side line-by-line text comparison.

How to use this tool

  1. Paste the original text on the left and the modified version on the right.
  2. Click Compute Diff.
  3. View additions in green, deletions in red, and overall similarity percentage.

How it works

Tokenizes lines and computes Longest Common Subsequences (LCS), generating structured diff chunks and similarity scores.

When to use this tool

  • Editors comparing draft revisions and editorial modifications.
  • Legal teams comparing document terms and policy clauses.

Frequently asked questions

Does it support multi-paragraph documents?

Yes, full documents with arbitrary line breaks are compared accurately.

Limitations

Optimized for text files and documents under 50,000 words.

Privacy

All text diffing is performed locally in browser memory.