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Prepend a TSV Column Guide
Learn when to use Prepend a TSV Column, how to use it correctly, and how to avoid common mistakes.
What this guide covers
Use this tool to prepend a new column to TSV data. It is useful when you need to add a fixed field, source tag, environment marker, or other leading column before existing TSV data.
This guide explains when to use Prepend a TSV Column, how to get a cleaner result,
and which mistakes to avoid before moving on to related tools or the main tool page.
Why use Prepend a TSV Column
Add a new first column to every TSV row quickly
Prepare exports with a leading label or source field
Avoid manual editing row by row
Keep the rest of the TSV structure intact
Work directly in the browser
How to use Prepend a TSV Column
Put the new column header on the first line
Put one value per TSV row after that
Leave a blank line
Paste the TSV below
Run the tool to add the new first column
Best use cases
Adding source columns to exports
Adding environment labels to data rows
Preparing TSV for imports that require an extra field
Tagging rows before reporting or review
Adding quick leading metadata to TSV
Common mistakes
The number of new values does not match the number of TSV data rows
Fix: Provide one new value for each TSV row below the header.
Forgetting the blank line before the TSV body
Fix: Put the new header and values first, then a blank line, then the TSV.
Using spaces instead of real tabs in the TSV
Fix: Make sure the TSV itself uses tab-separated columns.
Use the tool
Ready to run Prepend a TSV Column? Open the main tool page to enter your input,
generate the result, and copy or download the output.