How are rows matched?

By a key column you choose: ID, email, order number, etc.

What if there is no unique key?

Use row-order matching to compare position by position.

No. Everything runs locally in your browser.

Process files up to the browser memory limit.

Yes — filter the diff to additions, deletions, or modifications only.

Compare two CSV files and highlight added, removed, and changed rows. Securely process files in your browser memory with zero

Your files never leave your device. Processed locally. 100% private.

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Continue working with our suite of free data utilities.

Compare two versions of any text file (JSON, XML, Code)

Find and remove duplicate rows from CSV files based on selected key columns. The safest way to process sensitive data with ze

Compare two PDF versions and highlight all text and layout differences. The safest way to process sensitive data with zero-up