Append a CSV Column

Add a new column to your CSV instantly with the Append a CSV Column tool. Customize column name and values, preview live, and export with a single click.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total characters: 0
Options
Append to header row
Quote new values
Maximize output


How to Use:

  • Paste your CSV content in the Input CSV box or import a .csv or .txt file using the Choose File button.
  • The tool appends a new column to every row in the CSV and shows the result live in the Modified CSV Output box.
  • Below the output, you’ll see a live character count that updates with changes.
  • Use the Append to header row toggle to decide if the new column name should be added to the header.
  • Use the Quote new values toggle to wrap the appended values in quotes (useful for text fields).
  • Enter your desired column name and value in the text fields provided.
  • Enable Maximize output to enlarge the output area for easier viewing.
  • Click Copy Output to copy results to clipboard or Export to File to save as a .csv.
  • Use Clear All to reset everything including file, input, toggles, and counters.

What Append a CSV Column can do:

You can easily attach new values to every row in a CSV without external tools or code. Whether you’re tagging rows with a new status, adding flags for import, or labeling datasets with source information, this tool does it live and fast. It works with or without headers, can quote values if needed, and gives you full control over the added column’s name and contents. The file import feature supports plain-text types, and the layout adapts for longer results with a maximized output toggle. Ideal for quick CSV modification on the fly.

Example:

Before:

Name,Score
Alice,90
Bob,85
Charlie,92

With column name “Status” and value “N/A”:

After:

Name,Score,Status
Alice,90,N/A
Bob,85,N/A
Charlie,92,N/A

Common Use Cases:

Perfect for labeling imported CSVs, adding a default column like “Status: Pending” or “Source: Web”, or tagging records with identifiers before further processing. It’s especially handy for workflows involving batch uploads, survey tools, or dataset normalization. You get full control of the header and format, plus the ability to preview and export without needing Excel or code.

Useful Tools & Suggestions:

If you’re generating the new values on the fly, Create a Random CSV pairs well as a quick source. And after appending, run Count CSV Columns to make sure everything lined up correctly.

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