Compare CSV Datasets Instantly

Privacy-first CSV difference engine. Everything runs 100% inside your browser.

✓ 185+ Automated Tests

✓ 2,000+ Fuzz Runs

✓ 1M+ Rows Benchmarked

✓ Zero Bytes Uploaded

● Before Snapshot

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+ Choose or drop Before CSV

Supports single or multi-file datasets

● After Snapshot

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+ Choose or drop After CSV

Supports single or multi-file datasets

🔒 Files stay strictly local. No cloud storage or remote servers used.

How it works

Upload Datasets

Select your original and modified CSV files directly in your browser.

Auto-Match Keys

The algorithm automatically identifies primary keys and diffs field-by-field.

Inspect Diffs

Instantly audit added, removed, modified, and unchanged records.

Unlock Full Power

Pro Features

✓ Unlimited rows per dataset

✓ Multi-file CSV snapshots

✓ Export report summaries

✓ Manual primary key override

License Terms

✓ $7 lifetime license

✓ All future updates included

✓ Commercial use allowed

One-time payment. Lifetime access. No subscription.

🛡️ Analytics & Privacy Notice

We collect anonymous operational metrics (such as comparison performance and button clicks) to improve CSV Compare.
We never collect, upload, or analyze the contents of your CSV files. All comparisons happen 100% inside your browser.