CSV Join Key Checker

Compare two CSV exports before a lookup, merge, or import by checking matched, missing, blank, and duplicate join keys.

Left CSV

Right CSV

Left label

Right label

Delimiter

First row is header

Left key column

Right key column

Match keys case-insensitively Trim key whitespace

Matched Keys

Left Only

Right Only

Duplicate Keys

Join Readiness

Check two CSV files to see whether their key columns line up.

Key Set	Count	Examples
No check yet.

Copy-ready report

Ready.