Spreadsheets & data · ONLINE TOOL

Anonymize / pseudonymize CSV & Excel

FREE: explicitly protect selected columns. PRO: per-column policy, quasi-identifiers, simplified k, re-identification risk score and before/after comparison.

Local processingNo account required

USE CASES

When to use Anonymize / pseudonymize CSV & Excel?

FREE: explicitly protect selected CSV/TSV/XLSX columns. PRO: qualify direct identifiers, quasi-identifiers and sensitive attributes, apply a per-column policy, then measure residual risk before/after.

Prepare a business export before sharing with a vendor
Use stable pseudonyms for test data while acknowledging that records remain linkable
Reduce rare quasi-identifier combinations before sharing a table

CONCRETE EXAMPLE

HR export to share

BEFORE

Name · birth date · postal code · team

→

AFTER

Pseudonymized name · birth year · generalized postal code · unchanged team · before/after score

PRIVACY

Your data stays in the browser

Processed content is not uploaded to WorkToolset. Required libraries may be loaded by the site, but the file stays in the browser.

GOOD TO KNOW

Limitations to know

Displayed k is a simplified estimate computed only within the loaded file; it does not prove that a person cannot be re-identified using external data.
Stable pseudonymization or HMAC is not irreversible anonymization: rows remain linkable. Macro-enabled/signed XLSX files are excluded and formulas are preserved.

HOW IT WORKS

A straightforward workflow.

1Prepare the required input and choose useful options.
2Review previews, warnings and limitations before export.
3Download a new copy or report: the original stays unchanged.

PRIVACY

Frequently asked questions

Are my files uploaded to WorkToolset?

No. This tool runs locally in your browser.

Is my original file modified?

No. WorkToolset creates a new copy or export.

Do I need an account?

No for this free tool. Accounts are mainly used for favorites, presets and future workflows.