CSV Compare Tool

Compare two CSV files side-by-side. Find added, deleted, and modified rows with cell-level precision.

How it works: Upload two CSV files → choose comparison mode → click Compare → download differences as CSV or JSON. Privacy first: Everything runs in your browser — your data never leaves your device.

File A (Base)

Upload Base CSV

The original / reference file

File B (Comparison)

Upload Comparison CSV

The updated / modified file

Comparison Settings

Comparison Mode

Match rows by a unique identifier column. Best for tables with an ID or key column.

Upload both files to select primary key

Case-sensitive comparison

When enabled, "Apple" and "apple" are treated as different values.

Advanced Options

Benchmark Performance

Real-world tested, production-ready

141K rows/sec

50M+ rows tested

Cell-level diffs

View full benchmark →