ConvertCSV

Privacy Tools

Mask CSV Data

Partially hide emails, phones, and IDs while keeping format hints. Runs locally in your browser — nothing is uploaded for processing.

Input

Paste CSV or upload a file

Options

Output Preview

Result

Run the tool to preview output here.

Mask CSV Data

Mask CSV partially redacts values (emails keep domain shape; phones keep last digits). Leave columns blank to auto-detect common PII headers.

Everything runs in your browser. File contents are not uploaded to a server for this tool.

Key features

  • Client-side processing
  • Copy or download results
  • Works with paste or upload where applicable

About the CSV to CSV format

Masking is heuristic, not a compliance guarantee.

Common use cases

  • Screenshots and tickets
  • Semi-public reviews

How to use this tool

  1. Provide input (CSV, schema, or ciphertext).
  2. Set options if shown, then run the tool.
  3. Copy or download the result.

Tips for best results

  • For irreversible IDs prefer Hash CSV Columns.
  • Preview output before sharing or importing.

Common pitfalls

Keep a copy of the original file — transforms can be hard to reverse.

Frequently asked questions

Is my data uploaded?

No. Processing stays in your browser tab.

For more background on data formats and conversion workflows, read our format guides or browse the converter blog for step-by-step walkthroughs linked to each tool.