Prepend TSV Columns

Prepend TSV Columns lets you add a new column at the start of your tab-separated data instantly. Import, configure, and export in one step no coding required.

Paste your input above or import a file below.
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Supported file types: .txt, .tsv, .csv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total rows: 0
Options
Prepend header
Apply to all rows
Maximize output

How to Use:

  • Paste or import your TSV data into the input box.
  • Use the “Value to Prepend” input to set the content you’d like to insert as a new column (e.g., “ID”).
  • Toggle Prepend header on or off to control whether the first line gets the new value.
  • Toggle Apply to all rows if you want the value added to every row.
  • Use the Maximize output switch if you need more vertical space in the output box.
  • Output updates live as you type or adjust any setting.
  • Click Copy Output to copy the result or Export to File to download as a .tsv.
  • Click Clear All to reset input, output, toggles, and counters.

What Prepend TSV Columns can do:

Prepend TSV Columns adds a static value as a new leading column to each row of your tab-separated data. You control whether it applies to headers, data rows, or both. It’s great for injecting identifiers, batch labels, or metadata tags into TSV files without needing scripts or spreadsheet formulas. You can toggle settings in real-time, preview changes instantly, and export your results without leaving the browser.

The tool is also flexible enough for batch editing, such as tagging rows by source, category, or import batch. You get full control over the output, including optional header insertion and real-time counters.

Example:

Input:

name	age
Alice	30
Bob	25

Value to Prepend: IDPrepend header: ONApply to all rows: ON

Output:

ID	name	age
ID	Alice	30
ID	Bob	25

Common Use Cases:

You might use this tool to add a unique key or static value to every row in a dataset for database imports, preprocessing before scripting, or to track batches across systems. It saves time when preparing labeled TSVs for analysis, software pipelines, or manual review.

Useful Tools & Suggestions:

After using Prepend TSV Columns, it might help to run Display TSV Statistics to check that your new column landed where expected. And if you’re lining up other edits, TSV Column Inserter gives you more control over where fields go.

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