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Diff Checker— Free & Private

Compare two blocks of text and see the differences highlighted side by side.

Processed in your browser. Nothing uploaded.

What Is a Diff Checker?

A diff checker compares two blocks of text or code and highlights the differences between them line by line, showing additions, deletions, and modifications. It is an essential tool for code reviews, document version comparisons, and verifying changes before deployment. Our diff checker processes everything client-side in your browser, making it safe to compare confidential source code and sensitive documents.

How to Use Diff Checker

  1. Paste your original text

    Enter or paste the original version of your text or code in the left panel.

  2. Paste the modified text

    Enter or paste the changed version in the right panel.

  3. Review the differences

    See additions, deletions, and changes highlighted with color coding in a side-by-side or inline view.

Why Use Our Diff Checker?

Side-by-side and inline diff views for clear comparison
Color-coded highlighting for additions, deletions, and changes
Runs entirely in your browser — no text sent to any server
Supports code, plain text, configuration files, and more
Syntax-aware comparison for common programming languages
Line numbers for easy reference during code reviews
No file size limits or usage restrictions

Frequently Asked Questions

Can I compare code files in different programming languages?

Yes. The diff checker works with any plain text content regardless of the programming language. It compares text line by line and character by character to identify all differences.

Is my code safe when using this diff checker?

Absolutely. The comparison is performed entirely in your browser. Neither the original nor the modified text is transmitted to any server or stored anywhere.

What is the difference between side-by-side and inline diff views?

Side-by-side view shows the original and modified versions in parallel columns, making it easy to scan large changes. Inline view merges both versions into a single column with additions and deletions marked, which is better for reviewing small, scattered changes.