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Nablyx

CSV column mapper and renamer

Nothing uploadedTested up to 200 MB

Rename, reorder, and remove CSV columns before importing data into a CRM, store, database, or accounting system — without uploading your file.

Rename, reorder, keep, or drop columns in one CSV file entirely in your browser without uploading it, up to 200 MB. Every source column starts included: leave it as-is, rename it, move it up or down, or exclude it. The downloaded CSV contains only the included columns, in the names and order you choose, while your original file stays unchanged; the live preview shows the same mapping before export. The configured cap comes from end-to-end browser testing and is limited by processing time rather than memory. A file near the cap can still take tens of seconds to finish locally, and a modest laptop may take longer.

Processed locally in your browser

Column mapping workspace

Rename, reorder, and remove columns before your next CRM or ecommerce import.

Results will appear here

Add valid data in the workspace above to preview and download the result.

Prepare CSV columns for the system receiving them

  1. 1

    Upload one CSV file.

  2. 2

    Rename output columns to the required field names.

  3. 3

    Remove columns you do not need.

  4. 4

    Reorder columns and review the live preview.

  5. 5

    Download the mapped CSV.

Built for the real task

  • Column renaming
  • Drag-free reordering
  • Column removal
  • Live output preview

See the transformation

Awkward source headers become import-ready columns.

Rename the columns you need while keeping every value under the correct header.

cust_idcustomer_id
given_namefirst_name
mailemail

✓ Values stay with the right column

Browser limits

Files are limited to 200 MB to protect browser stability, especially on phones. Processing stays on this device.

Column renaming

Rename, reorder, and remove CSV columns before importing data into a CRM, store, database, or accounting system — without uploading your file.

Private by design

The selected file is not uploaded to Nablyx.

Processed locally in your browser

No. This tool reads and transforms the file locally in your browser.

Common uses

  • Column renaming
  • Drag-free reordering
  • Column removal
  • Live output preview

Does mapping change my original file?

No. Nablyx creates a new CSV in your browser. Your source file remains unchanged on your device.

Related guide

How to Map CSV Columns Between Two Systems Before an Import
How to Rename and Reorder CSV Columns Before an Import

Related tools

Continue with a related Nablyx tool.

Ready to work on your file?

Return to the workspace and process it locally.

Map CSV columns