TSV Column Prepender

The TSV Column Prepender Tool lets you insert a new column at the start of each row in a tab-separated file. Add custom values, set a header, and format the output with live preview and full file support.

Paste your input above or import a file below.
No file chosen
Supported file types: .tsv, .txt
Rows: 0, Columns: 0
Options
Header Row Present
Trim Whitespace

How to Use:

  1. Paste your TSV data into the Input TSV field or import a .tsv or .txt file.
  2. Enter one value per line in the Values to Prepend field.
  3. Use the Options panel to configure behavior:
    • Toggle Header Row Present if the TSV has a header.
    • Set a Header for New Column (used only if header row is enabled).
    • Toggle Trim Whitespace to clean extra spaces from each value.
  4. Click Prepend Column to update the output.
  5. Use Copy Output or Export to File to save the result.
  6. Click Clear All to reset everything.

What TSV Column Prepender Tool Can Do:

  • Adds a new column to the beginning of every row in a TSV.
  • Automatically inserts a header if present.
  • Aligns each new value with its corresponding row.
  • Trims whitespace and shows live output with row/column tracking.
  • Allows import, copy, export, and instant updates.

Example:

Input TSV:

Name	Math	Science  
Alice	85	90  
Bob	88	76  
Charlie	90	88

Values to Prepend:

ID001  
ID002  
ID003

Header for New Column:

ID

Result:

Name	Math	Science  
ID001	Alice	85	90  
ID002	Bob	88	76  
ID003	Charlie	90	88

Common Use Cases:

Use this tool to prepend unique identifiers, timestamps, tags, or metadata to each row in a TSV file. It’s ideal for enriching existing datasets, aligning content, or preparing files for import into structured systems.

Useful Tools & Suggestions:

After prepending columns to your TSV file, TSV Column Inserter is useful if you need to drop new data into a specific position later on. And if the structure gets too complex, TSV Column Exporter can help you pull out just the fields you want to keep.

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