Data Anonymizer & Pseudonymizer

Open a dataset, review the detected sensitive columns and choose what to keep, remove, mask, hash or pseudonymize.

Local: yes. Your input stays on your device and is not sent to an external service for this tool.

Anonymization and hashing run locally with the Web Crypto API.

Consistent pseudonyms

Pseudonymization hashes each original value together with the column name and your salt, then emits a short stable token. Equal source values remain equal within the anonymized dataset, preserving joins and grouping without exposing the original value.

Review before export

Automatic detection is only a suggestion. Every action remains visible and editable before processing.

Is my data uploaded?

No. The dataset is anonymized in your browser, so nothing you add is sent to gratistools.be. See the privacy page for details.

Frequently asked questions

Is this tool free?

Yes. The core tool is free to use in your browser.