📊

Diff Checker

Compare two texts side by side and see the differences highlighted.

Original Text

Modified Text

About Diff Checker

Free online diff checker that compares two blocks of text side by side and highlights every difference - additions, deletions, and modifications. See line-by-line and character-level changes with color-coded highlighting. Perfect for comparing code revisions, reviewing document edits, checking configuration file changes, and verifying that text transformations were applied correctly. Works entirely in your browser with no file uploads.

Frequently Asked Questions

How does the diff comparison work?▾

The tool compares the two texts line by line and highlights additions (green), deletions (red), and modifications. It uses a standard diff algorithm to identify the minimal set of changes between the two inputs.

Can I compare code files with this tool?▾

Yes. The tool works with any text content including source code, configuration files, JSON, HTML, and plain text. It preserves whitespace and formatting for accurate code comparison.

Does it show character-level differences?▾

Yes. In addition to line-level comparison, the tool highlights character-level changes within modified lines. This makes it easy to spot small typos, variable name changes, or single-character edits within otherwise similar lines.

Can I use this to review code changes?▾

Yes. The side-by-side diff view is similar to what you see in GitHub pull requests or Git diff output. Paste the old version on the left and the new version on the right to review exactly what has changed - perfect for code reviews without a Git setup.

Is this diff checker free?▾

Yes, completely free with no signup required. Compare any two texts of any length instantly. All processing happens in your browser - your text content is never sent to any server, making it safe for proprietary code and confidential documents.

Related Tools

📝

Word Counter

Count words, characters, sentences, and paragraphs in your text instantly.

🔤

Character Counter

Count characters with and without spaces. Perfect for Twitter, SMS, and meta descriptions.

🔠

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.

📄

Lorem Ipsum Generator

Generate placeholder text for your designs and layouts.

🔗

Text to Slug Converter

Convert any text into URL-friendly slugs for your website.

✨

Fancy Text Generator

Convert plain text into stylish Unicode fonts for social media bios.

Browse all 139+ free tools