difference

Text Diff Viewer

Compare two texts and highlight added and removed lines instantly.

edit_note Original
difference Modified
Enter text in both fields to see the diff

How to Use

  1. 1
    Paste original text

    Copy and paste your original (before) text into the left panel.

  2. 2
    Paste modified text

    Copy and paste the modified (after) version into the right panel.

  3. 3
    See differences highlighted instantly

    The diff output updates in real time as you type, showing exactly what changed.

  4. 4
    Green = added, Red = removed

    Green lines with a "+" prefix are lines added in the modified text. Red lines with a "−" prefix are lines removed from the original.

Common Use Cases

code

Code Review

Compare two versions of a code snippet to spot changes before submitting a pull request or reviewing a patch.

article

Document Comparison

Identify edits between drafts of a document, contract, or report without manually reading through both.

settings

Configuration Diffs

Diff server configs, environment files, or JSON settings to catch unintended changes between deployments.

spellcheck

Proofreading

See exactly what words or lines changed between an original draft and an edited version of any written content.

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Frequently Asked Questions

How does the diff algorithm work?

The tool uses the Longest Common Subsequence (LCS) algorithm to find the maximum set of lines that are identical in both texts, then marks everything else as added or removed.

Is my text sent to any server?

No. All comparison happens entirely in your browser using JavaScript. Your text is never sent to our servers.

What does green and red highlighting mean?

Green lines with a "+" prefix are lines that exist in the modified text but not in the original. Red lines with a "−" prefix are lines present in the original but absent from the modified version.

Is there a text size limit?

For very large texts the tool falls back to a simple line-by-line comparison to stay responsive. There is no hard character limit.

Does the diff work on a word or character level?

The comparison is line-based — each line is treated as a single unit. This matches the behavior of standard diff tools like Git diff.