What is a diff checker?

A diff checker is a tool that compares two pieces of text or code and highlights the differences between them. It shows which lines or words were added (green), removed (red), or changed (yellow), making it easy to review changes in documents, source code, configuration files, and more.

What diff modes are available?

Our diff checker supports three modes: Line-by-line (compares entire lines), Word-level (highlights individual word changes within lines), and Character-level (shows exact character-by-character differences). Choose based on how granular you need the comparison to be.

Can I compare code files?

Yes! Our diff checker supports all text-based files including JavaScript, TypeScript, Python, HTML, CSS, JSON, XML, Markdown, PHP, Ruby, Go, Java, C/C++, and more. Simply load or paste your code files and compare them instantly.

Is my data safe when using the diff checker?

Absolutely. All comparison happens entirely in your browser using JavaScript. Your text or code is never sent to any server, never stored, and never leaves your device. This makes it safe to compare sensitive code, confidential documents, or private data.

What does the 'Ignore whitespace' option do?

When 'Ignore whitespace' is enabled, differences caused only by spaces, tabs, or newlines are ignored during comparison. This is useful when comparing code that has been reformatted or indented differently but is functionally identical.

Can I compare large files?

Yes, the tool can handle reasonably large text files. Performance depends on your browser and device. For very large files (thousands of lines), the comparison may take a moment, but all processing remains local in your browser.

Diff Checker

Compare two texts or code files and highlight differences

Ignore whitespace Ignore case

Original

Load file

Modified

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Diff Checker

Original

Modified

Diff Result