How does Diff Checker work?

It compares two blocks of text and identifies lines that have been added, removed, or modified, highlighting them with colors (green for additions, red for removals).

Yes. All comparison happens locally in your browser using JavaScript. No text is ever sent to a server.

Diff Checker & Text Compare | Find Changes Instantly

Original Text

Modified Text

Why Use This Diff Checker?

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100% Private

We do not store your data. Comparisons run entirely in your browser memory.

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Instant Results

No waiting for server uploads. Get immediate feedback on code changes.

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Clean Output

Clear red/green highlighting makes identifying added and removed lines effortless.

Frequently Asked Questions

How does the Diff Checker work?

Our tool changes character-by-character or line-by-line to find exact differences between two text files. It uses the Myers diff algorithm to determine the shortest sequence of edits.

Is it secure?

Yes. Unlike many online tools, we process your data 100% locally in your browser. No text is ever uploaded to a server, making it safe for sensitive code or documents.

Can I compare code?

Absolutely. This tool is perfect for comparing source code, JSON files, configuration files, and SQL queries to spot bugs or changes.

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