Rename column headers and reorder columns in your CSV files instantly. Everything runs in your browser � your data never leaves your device.
Load CSV to configure column mappings
Delimiter
Detected columns:
Mapped CSV will appear here...Configure mappings and paste CSV
Three simple steps to rename and reorder your CSV columns.
Paste your CSV data directly or upload a file. The tool automatically detects columns and displays them as chips.
Enter new names for any columns you want to rename. You can also reorder columns using the mapping settings panel.
Preview the result with renamed columns and copy to clipboard or download as a file.
A CSV Column Mapper is a utility that renames and reassigns column headers in CSV files. Instead of manually editing header rows, this tool lets you define new names for columns and reorder them with a simple interface.
This is especially useful when working with data from different sources that use inconsistent naming conventions. For example, one system might use "first_name" while another expects "First Name" � our tool lets you bridge that gap instantly.
Standardize naming
Align column names across datasets from different sources.
Reorder columns
Arrange columns in the exact order your import requires.
Fix broken headers
Correct typos or garbled column names from exports.
Prepare for import
Match column names to database or API field requirements.
Paste or upload your CSV, and the tool will display all column headers. In the Mapping Settings panel, type new names for any columns you want to rename. The output updates in real time.
Yes. The mapping panel lets you set new names and define the output order. Columns appear in the output in the order you configure.
No. Only the column headers are changed. All data rows remain exactly as they were in the original file.
Yes. Everything runs in your browser. Your file is never uploaded to any server. You can verify this by disconnecting from the internet and using the tool offline.
For a complete CSV workflow, explore our other free tools:
All processing happens in your browser. Your data never leaves your device.