Free · Browser-local tools
Map CSV columns
Map CSV columns to a target schema. Review missing and discarded fields, preserve text values, and apply or download the result.
Map CSV
Start with your CSV
Open your file in the CSV editor with this tool already selected. Preview the result before downloading.
- Open your source CSV, then enter target columns or upload a target CSV template.
- Match source columns and review unmapped or discarded columns.
- Preview the ordered result, then copy, apply with undo or download.
Free · No signup · File contents stay in your browser. Back to page and Resume keep your edits in this tab. Download your edited copy before refreshing; refresh opens the original file. Open files up to 1 GiB with browser storage.
Try a small example
3 records · 3 columns| id | name | amount |
|---|---|---|
| 1 | Example one | 12 |
| 2 | Example two | 24 |
| 3 | Example three | 18 |
Mapped columns (amount omitted)
| customer_id | customer_name |
|---|---|
| 1 | Example one |
| 2 | Example two |
| 3 | Example three |
Illustrative fictional data. Open the sample to try the tool.
How to map csv
- 1
Open your source CSV, then enter target columns or upload a target CSV template.
- 2
Match source columns and review unmapped or discarded columns.
- 3
Preview the ordered result, then copy, apply with undo or download.
What to expect
Target columns retain your chosen order and cell values stay as text. Unmapped targets become empty strings; discarded source columns are explicitly listed.
Local files and clear limits
These tools process file contents on your device. The browser workspace accepts files up to 1 GiB and 5 million records, subject to available browser storage and decoded-record limits. This tool's calculations support up to 100,000 records, 2 million cells and 64 MB of text. Download a new copy to keep your result.
Plain answers
Map CSV questions
What can I do with this map csv tool?+
Target columns retain your chosen order and cell values stay as text. Unmapped targets become empty strings; discarded source columns are explicitly listed.
Does my CSV leave my device?+
File selection, editing and these task operations run in your browser. No account or file upload is required. Download a new copy to keep your result; refreshing restores the original input, not unsaved edits.
Do the editor and task have the same file limits?+
The editor opens files up to 1 GiB and 5 million records, subject to browser storage and decoded-record limits. This task supports up to 100,000 records, 2 million cells and 64 MB of decoded text.