What is a diff checker?

A diff checker compares two pieces of text and highlights the differences between them. It shows which lines were added (in green), removed (in red), or unchanged, similar to how Git shows code changes.

Can I compare code files?

Yes. The diff checker works with any plain text including source code (JavaScript, Python, HTML, CSS), JSON, Markdown, and more.

Is there a character or line limit?

No strict limit. The tool handles large texts efficiently using an LCS (Longest Common Subsequence) algorithm. For extremely large files, comparison may take a moment.

Does the comparison ignore whitespace?

By default, all whitespace differences are shown. This is especially useful for detecting accidental spacing changes in code.

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Free Text Diff Checker

Compare two texts or code files online. Instantly see added, removed, and changed lines highlighted side by side. Free, fast, and private.

Original (A)

Modified (B)

About This Tool

Compare two texts, code snippets, or documents side by side and instantly see every difference highlighted. Added lines appear in green, removed lines in red — making code reviews, document comparisons, and change tracking effortless.