Text Tools
Add a new CSV column at the beginning of every row.
Use this tool to prepend a new column to CSV data. It is useful when you need to add a fixed field, label, source tag, environment marker, or other leading column before existing CSV data.
Use this tool to prepend a new column to CSV data. It is useful when you need to add a fixed field, label, source tag, environment marker, or other leading column before existing CSV data.
Use prepend a csv column when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
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Input
source api api name,role John,admin Anna,editor
Output
source,name,role api,John,admin api,Anna,editor
Useful when you want every row labeled with its source.
Input
env prod prod id,title 1,Book 2,Pen
Output
env,id,title prod,1,Book prod,2,Pen
Adds a new leading field before the existing CSV columns.
Fix: Provide one new value for each CSV row below the header.
Fix: Put the new header and values first, then a blank line, then the CSV.
Fix: Make sure the CSV itself is valid before adding a new column.
It adds a new column at the beginning of the CSV and fills it with your provided values.
Yes. You should provide one value for each CSV data row.
No. It only adds a new first column and keeps the others in place.
The tool returns an error so you can fix the input.
Prepend adds the new column first, while Append adds it at the end.