CSV Column Replacer

The CSV Column Replacer Tool lets you overwrite a specific column in your CSV with new values. Match by column name or index, trim inputs, customize delimiters, and preview changes instantly. Supports file import, export, and copy.

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 using the Choose File button.
  2. Enter the column to replace in the Column to Replace field.
    • If Header Row Present is ON, use the column name (e.g., Science).
    • If OFF, use the column index (e.g., 2 for the third column).
  3. In the New Values box, enter one replacement value per line.
    • Each value will be used for each row in order.
    • Extra rows will use an empty value if replacements run out.
  4. Set a custom Delimiter if needed (default is ,).
  5. Enable Trim Whitespace to clean extra spaces from values.
  6. Click Replace Column to update the output.
  7. Use Copy Output or Export to File to save your result.
  8. Click Clear All to reset the tool.

What CSV Column Replacer Tool Can Do:

  • Replace a single column in a CSV file using names or indexes.
  • Accepts line-by-line input for new values or repeated static value.
  • Trims extra spacing, supports header detection, and uses a live counter.
  • Provides real-time output preview and exporting capabilities.

Example:

Input CSV:

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

New Values (Replacing Science):

95  
82

Result:

Name,Math,Science
Alice,85,95
Bob,88,82

Common Use Cases:

Use this tool to update test scores, mask sensitive data, reset fields in bulk, or revise outdated values in specific columns. Ideal for anyone managing large datasets or preparing cleaned CSVs for import.

Useful Tools & Suggestions:

After replacing columns in your CSV, CSV Column Exporter lets you quickly pull the updated fields into a clean, shareable file. And if you need to fine-tune the layout even more, CSV Column Swapper makes reorganizing columns simple without starting from scratch.

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