# CSV join tool

> Join two tables by selected keys with unmatched-row output.

[Open tool](https://www.toolcabana.com/su/csv-join-tool) · [Spreadsheets and data cleanup](https://www.toolcabana.com/su/category/spreadsheets-and-data-cleanup)

Tool ID: csv-join-tool. Requested language: su. Description language: en. Complete guide translation: no; untranslated sections use English.

## Supported tasks (en)

Join two tables by selected keys with unmatched-row output.

## Steps (en)

1. Choose a source file. If the tool accepts multiple files, arrange them in the order you want.
2. Set left key column, right key column, join.
3. Run csv join tool, review the output, then use the available copy or download controls.

## Settings

- Left key column (en; key: leftKey; type: text)
- Right key column (en; key: rightKey; type: text)
- Join (en; key: kind; type: select): left [en], inner [en], full [en]

## Limitations (en)

CSV/XLSX inputs are capped at 10 MB each, 200 columns and 20,000 rows; joined output is capped at 20,000 rows. JSONPath script/filter evaluation is disabled. Other operations apply their visible controls and text limits.

## Privacy and connections (en)

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

## Questions (en)

### What does csv join tool do?

Join two tables by selected keys with unmatched-row output.

### Where is my input processed?

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

### What are the input limits?

CSV/XLSX inputs are capped at 10 MB each, 200 columns and 20,000 rows; joined output is capped at 20,000 rows. JSONPath script/filter evaluation is disabled. Other operations apply their visible controls and text limits.

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