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CSV Data Handyman

by WebF1

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CSV Column Mapper

Map and clean CSV columns in your browser

Rename, reorder, include or exclude, and transform CSV columns with simple, deterministic operations: trim, change case, add prefix or suffix, or replace blank values with a default. Export a clean CSV. No uploads, no account, no tracking.

Your file is processed locally in your browser and is never uploaded to WebF1.

Import CSV

Drag and drop a CSV file here, or

Paste CSV text instead

Frequently asked questions

What does the CSV column mapper do?
It lets you rename, include or exclude, and reorder columns, then apply simple transforms (trim, case, prefix, suffix, default-blank) before exporting a new CSV.
Can I drop columns?
Yes. Untick the Include checkbox for any column you do not want in the output.
Can I change case or add a prefix?
Yes. Per-column transforms include trim, lowercase, uppercase, title case, prefix, suffix, and default-blank replacement.
Does it support custom JavaScript expressions?
No. To keep the tool safe, only the listed deterministic transforms are supported. No arbitrary code execution.
Is my CSV uploaded anywhere?
No. Mapping happens entirely in your browser. Nothing is sent to a server.

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