Are CSV files uploaded to a server?

No. The comparison on this page runs in your browser and the CSV or TSV contents are not uploaded by the tool.

How are rows matched between the two files?

Choose a key column such as id, requirement_id or sku. ReqDelta matches rows with the same key and compares the remaining columns.

Can I compare TSV files too?

Yes. The free comparison supports comma-separated and tab-separated data.

PRIVATE CSV DIFF · BROWSER-LOCAL

Compare CSV files online.

Paste or load two CSV/TSV versions and see which records were added, removed or changed. Match rows by a stable key column such as id, requirement_id or sku.

No uploadNo signupCSV + TSVKey-column matchingFree sample

Old CSV / Before

New CSV / After

0Matched keys

0Added

0Removed

0Changed

How to compare two CSV files

1. Choose a stable keyUse a unique column present in both files. IDs are better than row numbers because sorting can change between versions.

2. Compare the versionsReqDelta aligns records by the key, then checks every remaining column for value changes.

3. Review or export the diffFocus on added, removed and changed records instead of scanning entire spreadsheets by eye.

Useful when order and row counts change

Requirements & specifications

Compare requirement baselines by requirement ID and identify changed status, owner, text or acceptance criteria.

Product & catalog data

Match rows by SKU and find new, retired or modified product records even when rows are reordered.

Configuration exports

Compare exports from different dates while keeping sensitive contents inside your browser.

Why compare by key column?

A line-by-line text diff treats row moves as changes. A keyed CSV diff treats each record as the unit of comparison. That makes it easier to distinguish a real field change from harmless sorting or row insertion.

CSV comparison FAQ

Are my files uploaded?

No. This page performs the comparison in your browser. The CSV or TSV contents are not uploaded by the comparison tool.

Can I compare TSV files?

Yes. Choose Tab or leave delimiter detection on Auto.

What should I use as the key column?

Use a value that uniquely identifies one record across both versions, such as id, requirement_id, sku or ticket_id.

What does ReqDelta Pro add?

ReqDelta Pro is the paid local tool for larger comparisons and repeat use, with the existing product features and one-time pricing.

Need repeatable local comparison?

ReqDelta Pro is JPY 1,480 one-time. No subscription, account or AI API is required for the product workflow.

Buy ReqDelta Pro