▤Free
Join two CSV tables
Left-join tables on one named unique right-hand key.
Left-join tables on one named unique right-hand key. Keep every left-table row and append matching right-table columns using one shared header name. Missing right matches create empty cells, and overlapping names gain a right_ prefix.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
Input: id,name 1,A 2,B Right CSV: id,score 1,9 Join column: id
Example result
id,name,score 1,A,9 2,B,
Limitations and details
The right-hand key must be unique; multi-column joins and one-to-many right-table matches are not supported.
Inputs and options
- Input
- Text
- Right CSV
- Text
- Join column
- Text
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.