CSV Tools

Find Missing Rows

Find rows in one file that are missing from another

File A

File B

Missing Rows

Paste or upload two CSV files to find missing rows...

More Options

CSV Format

Input

Matching

How to Use This Tool

This tool finds rows from File A that do not appear in File B.

  1. Load your files — Paste or upload the source file into File A and the reference file into File B. Or click “Load sample” to try it out.
  2. View missing rows — Rows from File A that have no exact match in File B appear in the output.
  3. Copy or save — Copy the missing rows to your clipboard or save as a CSV file.

FAQ

4 questions
Does this tool upload my data?
No. It runs entirely in your browser using JavaScript. Your CSV data is never sent to a server.
How does row matching work?
Rows are compared by exact match — all cell values must be identical and in the same column order for two rows to be considered the same.
What does count-aware mode do?
By default, a row is 'missing' if it doesn't appear in File B at all. Count-aware mode considers duplicates — if File A has a row 3 times and File B has it once, 2 copies are reported as missing.
What if the files have different headers?
A warning is shown if headers differ. The output uses File A's header row.

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