CSV Column Trimmer & Size Reducer

Calculate file size reduction percentage when stripping unneeded columns from massive CSV datasets.

  • 100% free
  • Private in browser
  • No signup
  • No watermarks
Estimated Filtered File Size (MB)
11.3
Storage Space Saved (MB)
33.8
Size Reduction (%)
75

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About CSV Column Trimmer & Size Reducer

Calculate file size reduction percentage when stripping unneeded columns from massive CSV datasets. Enter Original CSV File Size, Total Original Columns and Selected Retained Columns and the tool works out Estimated Filtered File Size, Storage Space Saved and Size Reduction straight away. Everything runs in your browser, so your data never leaves your device.

How to use CSV Column Trimmer & Size Reducer

  1. Enter Original CSV File Size, Total Original Columns and Selected Retained Columns.
  2. Change any value to see the result update instantly.
  3. Read Estimated Filtered File Size, Storage Space Saved and Size Reduction in the results panel — copy or download what you need.

Key features

  • Shows Estimated Filtered File Size (MB)
  • Shows Storage Space Saved (MB)
  • Shows Size Reduction (%)
  • 3 adjustable inputs, results update as you type
  • No signup, no limits

Frequently asked questions

Is this calculation free and private?
Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
What does the CSV Column Trimmer & Size Reducer give me?
It works out Estimated Filtered File Size, Storage Space Saved and Size Reduction, updating live as you change the inputs.
What do I need to enter?
Just Original CSV File Size, Total Original Columns and Selected Retained Columns. Every field has a sensible default you can start from.
Is my data uploaded anywhere?
No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?
Yes. The layout adapts to small screens and needs no app or signup.

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CSV Column Trimmer & Size Reducer | TheToolss