CSV Difference Checker
Free online CSV diff tool. Compare two CSV datasets to find added rows, removed rows, and cell-level changes. Match by key column or row order, with RFC 4180 quoted-field support. No upload required.
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What is CSV Difference Checker?
The CSV Difference Checker is a browser-based tool that compares two comma-separated datasets and produces a clear breakdown of what changed between them — rows that were added, rows that were removed, and individual cells whose values were modified.
Key Benefits
- Instantly spot data drift between exports, versions, or branches
- Audit cell-level edits without eyeballing two spreadsheets side by side
- Match rows by primary key so reordering does not count as a change
- Export a structured text report for tickets, PRs, or compliance logs
- Keep sensitive data private — everything runs locally in the browser
Common Use Cases
- •Verifying a database export before and after a migration
- •Comparing product catalogs or price lists across versions
- •Reviewing manual edits made to a CSV in Excel or Google Sheets
- •Reconciling two data feeds from different teams or systems
- •Generating a change log for version-controlled CSV assets
How to Use the CSV Difference Checker
- Paste your two CSV datasets: Enter the original CSV in the left box (CSV A) and the new CSV in the right box (CSV B). Both must be comma-separated.
- Configure comparison options: Check "First row is header" if your data has column names, choose a mode (key column or row-by-row), and pick the key column index if matching by key.
- Read the summary and detail tables: The four summary tiles show counts of unchanged, added, removed, and changed rows. Scroll down to see color-coded tables for each category.
- Export the diff report: Click Copy to put a text summary on your clipboard, or Download to save it as a .txt file for sharing or record-keeping.
Key Features
- RFC 4180-compliant CSV parser that correctly handles quoted fields and escaped quotes
- Two diff modes: match rows by a key column (primary key) or compare position-by-position
- Cell-level change detection showing exactly which values moved from old to new
- Color-coded summary tiles for added (green), removed (red), and changed (amber) rows
- Toggles for header detection, whitespace normalization, and case sensitivity
- Export the full diff report as copyable text or a downloadable .txt file