CSV Column Prepender

The CSV Column Prepender Tool lets you insert a new column at the beginning of your CSV data. Define one value per row, add a custom header, and customize delimiter and formatting options. Import, preview, and export with ease.

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

How to Use:

  1. Paste your CSV data into the Input CSV field or import a .csv or .txt file.
  2. Enter the values you want to prepend one per row into the Values to Prepend box.
  3. Use the Options panel to adjust settings:
    • Toggle Header Row Present if the first line of your CSV contains column headers.
    • Set a Header for New Column (only applied if header is present).
    • Toggle Trim Whitespace to clean up cell values.
    • Set a custom Delimiter (default is comma).
  4. Click Prepend Column to generate the output instantly.
  5. Use Copy Output or Export to File to save your result.
  6. Click Clear All to reset all input and output fields.

What CSV Column Prepender Tool Can Do:

  • Prepends one new column to a CSV using values you provide.
  • Adds a column header if desired and detects headers automatically.
  • Supports custom delimiters and cleans whitespace from all values.
  • Works live with import/export, copy, and row/column counting.

Example:

Input CSV:

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

Values to Prepend:

ID001  
ID002

Header for New Column:

ID

Result:

ID,Name,Math,Science
ID001,Alice,85,90
ID002,Bob,88,76

Common Use Cases:

Use this tool to inject tracking IDs, timestamps, categories, or any extra reference column at the start of your data. It’s perfect for preparing files for import, enriching exported tables, or aligning rows with identifiers.

Useful Tools & Suggestions:

After adding columns to the beginning of your CSV, CSV Column Inserter is perfect if you later need to slot something into a specific spot. And once your structure feels complete, CSV Delimiter Changer makes it easy to adapt the file for different systems or software.

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