Text Diff Checker

Compare two blocks of text and see the differences highlighted word-by-word. Browser-only.

100% in your browser — files never uploaded.
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How to use the Text Diff Checker

  1. 1
    Use the controls
    Each tool runs entirely in your browser — no uploads.
  2. 2
    Read the output
    Updates live, with errors flagged if input is invalid.
  3. 3
    Copy
    Click Copy to put the result on your clipboard.

About this tool

Diffing finds the minimum set of insertions and deletions to turn one text into another. It's how Git, code reviews and 'track changes' work.

This tool uses word-level diffing, which is easier to read than character-level for natural language but more precise than line-level.

Frequently asked questions

Free?
Yes.
Browser-only?
Yes — no uploads.
Line-level?
Word-level — better for prose; for code use a dedicated diff viewer.
Library?
diff.js, dynamic-imported.
Mobile?
Yes.

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