A safer CSV join, without scripts or uploads

Merge by key.
See what will be lost first.

Join two exports on ID, email, SKU, or another shared identifier. Before creating the file, check blank keys, duplicates, unmatched records, and projected output rows.

Runs locally
Left, inner & full joins
No account
10 MB per file

Step 1

Choose two exports

File A has column namesIts first row is a header, not a data record. File B has column namesIts first row is a header, not a data record.

A Primary fileChoose a CSV file Browse B Lookup fileChoose a CSV file Browse

Step 2

Match the records

The key columns may have different names.

File A key File B key Join type

Trim key spaces“ C-100 ” matches “C-100” Ignore key case“Ada@x.com” matches “ada@x.com”

OptionalChoose output columnsAll columns are included by default · shared names use _a and _b

Choose both key columns to configure output.

Step 3

Review before merging

Blank keys never match each other.

Diagnostics appear after both keys are selected.

Files are parsed in memory and are never uploaded or stored.

Join guide

Pick the result you actually need.

Left

Keep every File A row and add File B columns where keys match.

Inner

Keep only records whose normalized key appears in both files.

Full

Keep all rows from both files, including unmatched and blank-key rows.

Merge by key.See what will be lost first.

Choose two exports

Match the records

Review before merging

0 rows ready

Pick the result you actually need.

Merge by key.
See what will be lost first.