Is my input uploaded?

No. This website tool runs in your browser. Only the optional public API version sends input to the authenticated API route.

Can I use this in an application?

Yes. The Developers documentation lists the authenticated endpoint, request parameters and response example.

Should I verify the result?

Yes. Deterministic tools are designed for repeatable results, but format-specific or heuristic output should still be checked for your use case.

Security & Cryptography

Data Masking Tool

Mask generic text, email addresses, phone numbers or payment-card digits for safer examples and logs.

Free foreverRuns in your browserNo sign-up

Sensitive valueData typeVisible characters at start (generic)Visible characters at end

Result

Enter your values and select mask data.

100% private - runs entirely in your browser.

Your input, keys and passwords are never uploaded. Want proof? Load this page, then turn off your internet - the tool still works. For an exact check, open your browser's DevTools Network tab and confirm no data is sent when you use it.

About the Data Masking Tool

Data Masking Tool is a focused browser-based utility. Mask generic text, email addresses, phone numbers or payment-card digits for safer examples and logs.

The calculation runs locally in your browser, so the supplied value is not uploaded to ToolsOnDuty. The same capability is also available through the authenticated developer API.

Key features

Fast local processing with explicit validation
Copy-ready structured result
No account, upload or paid data provider required

How to use

1Enter the sensitive value and data type.
2Choose any available conversion or formatting options.
3Run the tool and review a partially hidden representation.

Examples

Data Masking Tool example

Input: the sensitive value and data type

Output: a partially hidden representation

Frequently asked questions

Is my input uploaded?: No. This website tool runs in your browser. Only the optional public API version sends input to the authenticated API route.
Can I use this in an application?: Yes. The Developers documentation lists the authenticated endpoint, request parameters and response example.
Should I verify the result?: Yes. Deterministic tools are designed for repeatable results, but format-specific or heuristic output should still be checked for your use case.