Free Text & Code Diff Checker

Compare two blocks of text or source code side by side or inline. Highlight additions, deletions, and modifications with line, word, and character granularity. Filter out whitespace and case changes with zero sign up required. Runs 100% in your browser.

  • 100% free
  • No sign up
  • Runs in your browser
Diff By:
Original Text / Code
|
Modified Text / Code
Comparison Result
+2 additions-2 deletions6 total blocks
Original
function calculateTotal(items, discountRate) { var total = 0; for (var i = 0; i < items.length; i++) { total = total + items[i].price;
}
if (discountRate) { total = total - (total * discountRate); } return total;
}
Modified
function calculateTotal(items, discountRate = 0) { // Use modern reduce for cleaner array aggregation const subtotal = items.reduce((sum, item) => sum + item.price, 0); if (discountRate > 0) { return subtotal * (1 - discountRate);
}
return subtotal;
}

How to compare text and code

  1. 1

    Paste your original text or code into the left pane.

  2. 2

    Paste your updated or modified version into the right pane.

  3. 3

    Choose your diff granularity: Line-by-line, Word-by-word, or Character-level.

  4. 4

    Toggle between Side-by-Side or Inline view to review your additions and deletions.

Frequently asked questions

What is a diff checker?+

A diff checker compares two texts, documents, or blocks of code and highlights the exact differences—such as added lines (green) and removed lines (red)—making revisions and modifications easy to track.

What is the difference between line diff and word diff?+

A line diff compares text line-by-line, which is best for code files and scripts. A word diff inspects changes inside individual sentences, making it ideal for proofreading articles, essays, and copywriting revisions.

Can I ignore spaces and case differences?+

Yes. You can toggle 'Ignore whitespace' and 'Ignore case' in the settings bar to filter out formatting, tab, or capitalization discrepancies and focus only on substantive text changes.

Is my text comparison sent to a remote server?+

No. Diff computation runs entirely on your client machine using JavaScript. None of your confidential code, legal contracts, or draft text leaves your browser.

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Free Online Text & Code Diff Checker - Compare Two Texts | LinkMeow