CSV Diff Tool - Compare Two CSV Files Online

Compare two CSV files side-by-side with cell-level highlighting. Detect added, removed, and modified rows instantly. Export diff reports as HTML or CSV.

Original CSV (File A)

Drop CSV file here or click to browse

Modified CSV (File B)

Drop CSV file here or click to browse

Load two CSV files to see the comparison

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Frequently Asked Questions

The tool parses both CSV files, aligns rows by matching content, and performs cell-by-cell comparison. Added rows are highlighted in green, removed rows in red, and modified cells in yellow. The comparison is based on row similarity scoring.

Yes, the tool handles CSVs with different structures. Extra columns in either file are clearly marked, and missing columns are shown as empty cells with appropriate indicators.

The tool uses intelligent row matching based on content similarity. It attempts to align rows even if they appear in different order, though sequential matching provides the clearest results.

Yes, you can download the comparison as an HTML report with color-coded differences, or export as CSV with status columns indicating added/removed/modified rows and cells.

The tool runs entirely in your browser and handles files up to several thousand rows efficiently. Very large files (10,000+ rows) may take longer to process depending on your device.

Each cell is compared as a trimmed string. If values differ after normalization, the cell is marked as modified and both old and new values are shown in the diff view.

Yes, you can paste CSV content directly into the text areas. The tool supports both file upload and manual paste, giving you flexibility in how you provide input.

The tool auto-detects common delimiters (comma, semicolon, tab, pipe) by analyzing the first few lines. You can also manually specify a delimiter if auto-detection fails.

Yes, if both CSVs have headers, the first row is treated as column names and displayed prominently. Column name changes are highlighted separately from data changes.

No, all processing happens locally in your browser. Your CSV files never leave your device, ensuring complete privacy and security for sensitive data.

Original CSV (File A)

Modified CSV (File B)

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