CSV Column Appender

The CSV Column Appender Tool lets you add a new column to the end of your CSV data. Enter one value per row, assign a custom column header, and configure delimiter and formatting options. Includes import, export, and instant preview.

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 into the Input CSV box or import a .csv or .txt file.
  2. In the Values to Append field, enter one value per row.
  3. Use the Options panel to customize behavior:
    • Toggle Header Row Present if the CSV includes a header.
    • Enter a Header for New Column to use as the appended column’s name.
    • Toggle Trim Whitespace to clean input values.
    • Set a custom Delimiter (defaults to comma).
  4. Click Append Column to apply changes.
  5. Use Copy Output or Export to File to save the result.
  6. Click Clear All to reset the tool completely.

What CSV Column Appender Tool Can Do:

  • Appends a new column to each row in a CSV using provided values.
  • Automatically aligns new values with existing rows.
  • Supports custom column headers, whitespace trimming, and delimiters.
  • Displays live row and column count, with real-time preview and export options.

Example:

Input CSV:

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

Values to Append:

Pass  
Fail

Header for New Column:

Result

Result:

Name,Math,Science,Result
Alice,85,90,Pass
Bob,88,76,Fail

Common Use Cases:

Use this tool to add status labels, tags, flags, IDs, or any other data to your CSV rows. It’s ideal for preparing enriched datasets, appending results after analysis, or generating import-ready files for other systems.

Useful Tools & Suggestions:

Once you’ve appended new columns to your CSV, CSV Column Prepender gives you a way to balance it out by adding data at the start too. And if you’re ready to share or analyze, CSV Column Exporter helps you grab just the fields you care about from the updated file.

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