Reconcile Two CSV Files by Key Column

Compare CSV files instantly in your browser—no uploads, no servers, no waiting.

Use Spreadsheet Compare Free → View Pro Plans

🔒 Your files never leave your device—all comparison happens locally in your browser.

Spreadsheet Compare lets you reconcile two CSV files by key column in seconds, entirely in your browser. No file uploads means your data stays private and processing is lightning-fast. Perfect for accountants, data analysts, and business teams who need quick, secure reconciliation.

Why SnapTools

Built different by design

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Instant Results Match records by any key column—account number, ID, email, or custom field

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Zero Uploads Identify missing rows, duplicates, and value mismatches instantly

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No Limits Download detailed comparison reports with highlighted differences

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Works Anywhere Runs in your browser. Files are never uploaded.

How it works

Three steps. That's it.

Upload or paste your first CSV file and select the key column to match on

Add your second CSV file and map its key column to the same field

Review side-by-side results showing matches, missing records, and differences

Ready to try it?

Free forever. No account required. No files uploaded anywhere.

Open Spreadsheet Compare Free →

Questions

Frequently asked

Yes, completely. All processing happens in your browser with zero server uploads. Your files are never stored or transmitted anywhere.

Runs in your browser. Files are never uploaded.

We support standard CSV and delimiter-separated files up to your browser's memory limit (typically several GB). Most business reconciliation files process in seconds.

No. Spreadsheet Compare runs entirely in your web browser—Chrome, Firefox, Safari, Edge. No installation or additional tools required.

Yes. You map columns from each file during setup, so column order doesn't matter. Match by any key field you choose.