CSV Column Extractor
AvailableExtract selected columns by header name or 1-based position, preserving their chosen order.
CSV Column Extractor
AvailableNothing to show yet
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Enter column names from the first row or 1-based column numbers, separated by commas. The output follows the order you enter.
Validated locally: file type, size and browser support are checked before anything runs
Preparing your file
Reading the file locally and checking that its type and size match what this tool expects. Nothing has been uploaded.
Converting locally
CSV, TSV, JSON, and basic XLSX processing use browser-native APIs and the included ZIP reader.
- Read
- Validate
- Convert
- Package
You can leave this tab open in the background — the conversion keeps running on your device, and progress is reported when you come back.
Conversion complete
Your converted file is ready to download.
Nothing to show yet
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Nothing to show yet
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Output format
CSV
Duration
—
Processed
On your device
Size change
—
The converted file was assembled in your browser and is released when you leave or reset this page
Something went wrong
The conversion could not be completed. Nothing was uploaded, and no partial file was saved.
This conversion is not supported yet
Your file passed every local check, and this is exactly where the Spreadsheet engine engine takes over. It does not implement this particular input and output pair yet, so nothing was converted and no download was offered.
| Engine | Spreadsheet engine |
|---|---|
| Frontend module | static/engines/spreadsheet-engine.js |
| Extra downloads | None — this tool runs on browser APIs alone |
| Runs in a worker | No — the browser is fast enough here |
| Processing | On your device |
This page is the integration point. When the engine lands, it is loaded here and the same six states drive the real conversion.
No upload for supported tools — the file is processed by this browser
Up to 50 MB
About this converter
Extract selected columns by header name or 1-based position, preserving their chosen order.
What happens to your file
For supported tools the file is read with the browser File API and held in memory on your device. It is validated, processed by the Spreadsheet engine engine in a Web Worker, and the result is handed back as a download. At no point is the file sent to a server.
What to expect from the output
The tool writes CSV. Formats differ in what they can represent, so expect simple structure to transfer reliably while detailed layout may be simplified by the target format.
How to use this converter
Four steps, none of which involve an account.
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1 Choose your file
Drop a csv file onto the drop area or browse for it.
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2 Check the output
The output format is preselected as CSV. Change it if the tool supports other targets.
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3 Convert
Everything happens on your device, so speed depends on your machine rather than a queue.
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4 Download
Save the result, then reset the tool to clear it from memory and start again.
Conversion states
Design referenceThese are the six states the workspace moves through. The live tool above uses the same markup; this panel shows each one side by side so the behaviour can be reviewed without converting anything.
1 Empty — no file chosen
2 File selected — ready to convert
- CSV example.csv
3 Preparing — reading locally
Preparing your file
Checking the file type and size. Nothing has been uploaded.
4 Converting — progress reported
Converting locally
- Read
- Validate
- Convert
- Package
Runs in a Web Worker so the page stays responsive.
5 Completed — result ready
Conversion complete
Your converted file is ready to download.
# Release notes
- Faster image conversion
- **New:** Markdown to PDF
- Fixed line ending detection
release-notes.md
Release notes
Faster image conversion
New: Markdown to PDF
Fixed line ending detection
release-notes.html
Output format
CSV
Duration
—
Processed
On your device
Size change
—
Interface preview
This is the completed state as designed. No file was converted and the download action is disabled, because the conversion engine for this tool has not been connected yet.
The converted file was assembled in your browser and is released when you leave or reset this page
6 Error — recoverable
That file could not be read
The file appears to be damaged or its contents do not match the
.csv extension. Nothing was uploaded.
Try again
Choose a different file
Frequently asked questions
Answers specific to CSV Column Extractor.
Is this tool free?
Yes. CSV Column Extractor is free to use and needs no account, no sign-up and no email address.
Where is my file processed?
This tool is being built for local processing, so the file is handled by your own browser. Until that engine is connected the page shows an explicit notice instead of pretending the conversion succeeded.
Which files can I use as input?
Accepted formats are CSV. The converter writes CSV.
Which Excel files are supported?
Excel to CSV reads XLSX files and exports the first worksheet. CSV to Excel writes values to a new XLSX workbook; formulas and formatting are not generated.
Which worksheet is exported?
Excel to CSV reads the workbook's first worksheet. Other worksheets and workbook formatting are not included in the CSV.
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