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Mask Sensitive CSV Data
Replace sensitive values in CSV fields before sharing sample data, tickets, or screenshots.
Problem
You need to share a realistic dataset without exposing emails, phone numbers, IDs, or private fields.
What to do
Masking preserves the shape of the data while reducing exposure risk. It is useful for support, demos, and testing.
- 1Load the CSV.
- 2Choose fields or patterns to mask.
- 3Export the masked copy and keep the original private.
Use the browser tool
Data Masking Tool is a free, browser-based tool that helps you get the job done quickly. Mask sensitive fields in a dataset. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.
People also ask
- How do I use Data Masking Tool?
- Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Mask sensitive fields in a dataset.
- Is my data uploaded or stored anywhere?
- No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
- Is Data Masking Tool free?
- Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.